5370 lines
208 KiB
C
5370 lines
208 KiB
C
/* Redis Sentinel implementation
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*
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* Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "server.h"
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#include "hiredis.h"
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#ifdef USE_OPENSSL
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#include "openssl/ssl.h"
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#include "hiredis_ssl.h"
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#endif
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#include "async.h"
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#include <ctype.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <fcntl.h>
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extern char **environ;
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#ifdef USE_OPENSSL
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extern SSL_CTX *redis_tls_ctx;
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extern SSL_CTX *redis_tls_client_ctx;
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#endif
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#define REDIS_SENTINEL_PORT 26379
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/* ======================== Sentinel global state =========================== */
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/* Address object, used to describe an ip:port pair. */
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typedef struct sentinelAddr {
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char *hostname; /* Hostname OR address, as specified */
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char *ip; /* Always a resolved address */
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int port;
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} sentinelAddr;
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/* A Sentinel Redis Instance object is monitoring. */
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#define SRI_MASTER (1<<0)
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#define SRI_SLAVE (1<<1)
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#define SRI_SENTINEL (1<<2)
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#define SRI_S_DOWN (1<<3) /* Subjectively down (no quorum). */
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#define SRI_O_DOWN (1<<4) /* Objectively down (confirmed by others). */
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#define SRI_MASTER_DOWN (1<<5) /* A Sentinel with this flag set thinks that
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its master is down. */
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#define SRI_FAILOVER_IN_PROGRESS (1<<6) /* Failover is in progress for
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this master. */
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#define SRI_PROMOTED (1<<7) /* Slave selected for promotion. */
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#define SRI_RECONF_SENT (1<<8) /* SLAVEOF <newmaster> sent. */
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#define SRI_RECONF_INPROG (1<<9) /* Slave synchronization in progress. */
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#define SRI_RECONF_DONE (1<<10) /* Slave synchronized with new master. */
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#define SRI_FORCE_FAILOVER (1<<11) /* Force failover with master up. */
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#define SRI_SCRIPT_KILL_SENT (1<<12) /* SCRIPT KILL already sent on -BUSY */
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#define SRI_MASTER_REBOOT (1<<13) /* Master was detected as rebooting */
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/* Note: times are in milliseconds. */
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#define SENTINEL_PING_PERIOD 1000
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static mstime_t sentinel_info_period = 10000;
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static mstime_t sentinel_ping_period = SENTINEL_PING_PERIOD;
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static mstime_t sentinel_ask_period = 1000;
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static mstime_t sentinel_publish_period = 2000;
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static mstime_t sentinel_default_down_after = 30000;
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static mstime_t sentinel_tilt_trigger = 2000;
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static mstime_t sentinel_tilt_period = SENTINEL_PING_PERIOD * 30;
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static mstime_t sentinel_slave_reconf_timeout = 10000;
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static mstime_t sentinel_min_link_reconnect_period = 15000;
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static mstime_t sentinel_election_timeout = 10000;
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static mstime_t sentinel_script_max_runtime = 60000; /* 60 seconds max exec time. */
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static mstime_t sentinel_script_retry_delay = 30000; /* 30 seconds between retries. */
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static mstime_t sentinel_default_failover_timeout = 60*3*1000;
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#define SENTINEL_HELLO_CHANNEL "__sentinel__:hello"
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#define SENTINEL_DEFAULT_SLAVE_PRIORITY 100
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#define SENTINEL_DEFAULT_PARALLEL_SYNCS 1
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#define SENTINEL_MAX_PENDING_COMMANDS 100
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#define SENTINEL_MAX_DESYNC 1000
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#define SENTINEL_DEFAULT_DENY_SCRIPTS_RECONFIG 1
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#define SENTINEL_DEFAULT_RESOLVE_HOSTNAMES 0
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#define SENTINEL_DEFAULT_ANNOUNCE_HOSTNAMES 0
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/* Failover machine different states. */
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#define SENTINEL_FAILOVER_STATE_NONE 0 /* No failover in progress. */
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#define SENTINEL_FAILOVER_STATE_WAIT_START 1 /* Wait for failover_start_time*/
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#define SENTINEL_FAILOVER_STATE_SELECT_SLAVE 2 /* Select slave to promote */
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#define SENTINEL_FAILOVER_STATE_SEND_SLAVEOF_NOONE 3 /* Slave -> Master */
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#define SENTINEL_FAILOVER_STATE_WAIT_PROMOTION 4 /* Wait slave to change role */
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#define SENTINEL_FAILOVER_STATE_RECONF_SLAVES 5 /* SLAVEOF newmaster */
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#define SENTINEL_FAILOVER_STATE_UPDATE_CONFIG 6 /* Monitor promoted slave. */
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#define SENTINEL_MASTER_LINK_STATUS_UP 0
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#define SENTINEL_MASTER_LINK_STATUS_DOWN 1
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/* Generic flags that can be used with different functions.
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* They use higher bits to avoid colliding with the function specific
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* flags. */
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#define SENTINEL_NO_FLAGS 0
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#define SENTINEL_GENERATE_EVENT (1<<16)
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#define SENTINEL_LEADER (1<<17)
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#define SENTINEL_OBSERVER (1<<18)
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/* Script execution flags and limits. */
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#define SENTINEL_SCRIPT_NONE 0
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#define SENTINEL_SCRIPT_RUNNING 1
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#define SENTINEL_SCRIPT_MAX_QUEUE 256
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#define SENTINEL_SCRIPT_MAX_RUNNING 16
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#define SENTINEL_SCRIPT_MAX_RETRY 10
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/* SENTINEL SIMULATE-FAILURE command flags. */
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#define SENTINEL_SIMFAILURE_NONE 0
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#define SENTINEL_SIMFAILURE_CRASH_AFTER_ELECTION (1<<0)
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#define SENTINEL_SIMFAILURE_CRASH_AFTER_PROMOTION (1<<1)
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/* The link to a sentinelRedisInstance. When we have the same set of Sentinels
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* monitoring many masters, we have different instances representing the
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* same Sentinels, one per master, and we need to share the hiredis connections
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* among them. Otherwise if 5 Sentinels are monitoring 100 masters we create
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* 500 outgoing connections instead of 5.
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*
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* So this structure represents a reference counted link in terms of the two
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* hiredis connections for commands and Pub/Sub, and the fields needed for
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* failure detection, since the ping/pong time are now local to the link: if
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* the link is available, the instance is available. This way we don't just
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* have 5 connections instead of 500, we also send 5 pings instead of 500.
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*
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* Links are shared only for Sentinels: master and slave instances have
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* a link with refcount = 1, always. */
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typedef struct instanceLink {
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int refcount; /* Number of sentinelRedisInstance owners. */
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int disconnected; /* Non-zero if we need to reconnect cc or pc. */
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int pending_commands; /* Number of commands sent waiting for a reply. */
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redisAsyncContext *cc; /* Hiredis context for commands. */
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redisAsyncContext *pc; /* Hiredis context for Pub / Sub. */
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mstime_t cc_conn_time; /* cc connection time. */
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mstime_t pc_conn_time; /* pc connection time. */
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mstime_t pc_last_activity; /* Last time we received any message. */
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mstime_t last_avail_time; /* Last time the instance replied to ping with
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a reply we consider valid. */
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mstime_t act_ping_time; /* Time at which the last pending ping (no pong
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received after it) was sent. This field is
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set to 0 when a pong is received, and set again
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to the current time if the value is 0 and a new
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ping is sent. */
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mstime_t last_ping_time; /* Time at which we sent the last ping. This is
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only used to avoid sending too many pings
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during failure. Idle time is computed using
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the act_ping_time field. */
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mstime_t last_pong_time; /* Last time the instance replied to ping,
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whatever the reply was. That's used to check
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if the link is idle and must be reconnected. */
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mstime_t last_reconn_time; /* Last reconnection attempt performed when
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the link was down. */
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} instanceLink;
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typedef struct sentinelRedisInstance {
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int flags; /* See SRI_... defines */
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char *name; /* Master name from the point of view of this sentinel. */
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char *runid; /* Run ID of this instance, or unique ID if is a Sentinel.*/
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uint64_t config_epoch; /* Configuration epoch. */
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sentinelAddr *addr; /* Master host. */
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instanceLink *link; /* Link to the instance, may be shared for Sentinels. */
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mstime_t last_pub_time; /* Last time we sent hello via Pub/Sub. */
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mstime_t last_hello_time; /* Only used if SRI_SENTINEL is set. Last time
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we received a hello from this Sentinel
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via Pub/Sub. */
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mstime_t last_master_down_reply_time; /* Time of last reply to
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SENTINEL is-master-down command. */
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mstime_t s_down_since_time; /* Subjectively down since time. */
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mstime_t o_down_since_time; /* Objectively down since time. */
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mstime_t down_after_period; /* Consider it down after that period. */
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mstime_t master_reboot_down_after_period; /* Consider master down after that period. */
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mstime_t master_reboot_since_time; /* master reboot time since time. */
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mstime_t info_refresh; /* Time at which we received INFO output from it. */
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dict *renamed_commands; /* Commands renamed in this instance:
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Sentinel will use the alternative commands
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mapped on this table to send things like
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SLAVEOF, CONFING, INFO, ... */
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/* Role and the first time we observed it.
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* This is useful in order to delay replacing what the instance reports
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* with our own configuration. We need to always wait some time in order
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* to give a chance to the leader to report the new configuration before
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* we do silly things. */
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int role_reported;
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mstime_t role_reported_time;
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mstime_t slave_conf_change_time; /* Last time slave master addr changed. */
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/* Master specific. */
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dict *sentinels; /* Other sentinels monitoring the same master. */
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dict *slaves; /* Slaves for this master instance. */
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unsigned int quorum;/* Number of sentinels that need to agree on failure. */
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int parallel_syncs; /* How many slaves to reconfigure at same time. */
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char *auth_pass; /* Password to use for AUTH against master & replica. */
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char *auth_user; /* Username for ACLs AUTH against master & replica. */
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/* Slave specific. */
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mstime_t master_link_down_time; /* Slave replication link down time. */
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int slave_priority; /* Slave priority according to its INFO output. */
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int replica_announced; /* Replica announcing according to its INFO output. */
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mstime_t slave_reconf_sent_time; /* Time at which we sent SLAVE OF <new> */
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struct sentinelRedisInstance *master; /* Master instance if it's slave. */
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char *slave_master_host; /* Master host as reported by INFO */
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int slave_master_port; /* Master port as reported by INFO */
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int slave_master_link_status; /* Master link status as reported by INFO */
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unsigned long long slave_repl_offset; /* Slave replication offset. */
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/* Failover */
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char *leader; /* If this is a master instance, this is the runid of
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the Sentinel that should perform the failover. If
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this is a Sentinel, this is the runid of the Sentinel
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that this Sentinel voted as leader. */
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uint64_t leader_epoch; /* Epoch of the 'leader' field. */
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uint64_t failover_epoch; /* Epoch of the currently started failover. */
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int failover_state; /* See SENTINEL_FAILOVER_STATE_* defines. */
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mstime_t failover_state_change_time;
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mstime_t failover_start_time; /* Last failover attempt start time. */
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mstime_t failover_timeout; /* Max time to refresh failover state. */
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mstime_t failover_delay_logged; /* For what failover_start_time value we
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logged the failover delay. */
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struct sentinelRedisInstance *promoted_slave; /* Promoted slave instance. */
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/* Scripts executed to notify admin or reconfigure clients: when they
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* are set to NULL no script is executed. */
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char *notification_script;
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char *client_reconfig_script;
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sds info; /* cached INFO output */
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} sentinelRedisInstance;
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/* Main state. */
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struct sentinelState {
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char myid[CONFIG_RUN_ID_SIZE+1]; /* This sentinel ID. */
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uint64_t current_epoch; /* Current epoch. */
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dict *masters; /* Dictionary of master sentinelRedisInstances.
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Key is the instance name, value is the
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sentinelRedisInstance structure pointer. */
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int tilt; /* Are we in TILT mode? */
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int running_scripts; /* Number of scripts in execution right now. */
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mstime_t tilt_start_time; /* When TITL started. */
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mstime_t previous_time; /* Last time we ran the time handler. */
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list *scripts_queue; /* Queue of user scripts to execute. */
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char *announce_ip; /* IP addr that is gossiped to other sentinels if
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not NULL. */
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int announce_port; /* Port that is gossiped to other sentinels if
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non zero. */
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unsigned long simfailure_flags; /* Failures simulation. */
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int deny_scripts_reconfig; /* Allow SENTINEL SET ... to change script
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paths at runtime? */
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char *sentinel_auth_pass; /* Password to use for AUTH against other sentinel */
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char *sentinel_auth_user; /* Username for ACLs AUTH against other sentinel. */
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int resolve_hostnames; /* Support use of hostnames, assuming DNS is well configured. */
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int announce_hostnames; /* Announce hostnames instead of IPs when we have them. */
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} sentinel;
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/* A script execution job. */
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typedef struct sentinelScriptJob {
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int flags; /* Script job flags: SENTINEL_SCRIPT_* */
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int retry_num; /* Number of times we tried to execute it. */
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char **argv; /* Arguments to call the script. */
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mstime_t start_time; /* Script execution time if the script is running,
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otherwise 0 if we are allowed to retry the
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execution at any time. If the script is not
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running and it's not 0, it means: do not run
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before the specified time. */
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pid_t pid; /* Script execution pid. */
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} sentinelScriptJob;
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/* ======================= hiredis ae.c adapters =============================
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* Note: this implementation is taken from hiredis/adapters/ae.h, however
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* we have our modified copy for Sentinel in order to use our allocator
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* and to have full control over how the adapter works. */
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typedef struct redisAeEvents {
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redisAsyncContext *context;
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aeEventLoop *loop;
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int fd;
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int reading, writing;
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} redisAeEvents;
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static void redisAeReadEvent(aeEventLoop *el, int fd, void *privdata, int mask) {
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((void)el); ((void)fd); ((void)mask);
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redisAeEvents *e = (redisAeEvents*)privdata;
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redisAsyncHandleRead(e->context);
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}
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static void redisAeWriteEvent(aeEventLoop *el, int fd, void *privdata, int mask) {
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((void)el); ((void)fd); ((void)mask);
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redisAeEvents *e = (redisAeEvents*)privdata;
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redisAsyncHandleWrite(e->context);
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}
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static void redisAeAddRead(void *privdata) {
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redisAeEvents *e = (redisAeEvents*)privdata;
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aeEventLoop *loop = e->loop;
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if (!e->reading) {
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e->reading = 1;
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aeCreateFileEvent(loop,e->fd,AE_READABLE,redisAeReadEvent,e);
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}
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}
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static void redisAeDelRead(void *privdata) {
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redisAeEvents *e = (redisAeEvents*)privdata;
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aeEventLoop *loop = e->loop;
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if (e->reading) {
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e->reading = 0;
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aeDeleteFileEvent(loop,e->fd,AE_READABLE);
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}
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}
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static void redisAeAddWrite(void *privdata) {
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redisAeEvents *e = (redisAeEvents*)privdata;
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aeEventLoop *loop = e->loop;
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if (!e->writing) {
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e->writing = 1;
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aeCreateFileEvent(loop,e->fd,AE_WRITABLE,redisAeWriteEvent,e);
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}
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}
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static void redisAeDelWrite(void *privdata) {
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redisAeEvents *e = (redisAeEvents*)privdata;
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aeEventLoop *loop = e->loop;
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if (e->writing) {
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e->writing = 0;
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aeDeleteFileEvent(loop,e->fd,AE_WRITABLE);
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}
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}
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static void redisAeCleanup(void *privdata) {
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redisAeEvents *e = (redisAeEvents*)privdata;
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redisAeDelRead(privdata);
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redisAeDelWrite(privdata);
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zfree(e);
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}
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static int redisAeAttach(aeEventLoop *loop, redisAsyncContext *ac) {
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redisContext *c = &(ac->c);
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redisAeEvents *e;
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/* Nothing should be attached when something is already attached */
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if (ac->ev.data != NULL)
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return C_ERR;
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/* Create container for context and r/w events */
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e = (redisAeEvents*)zmalloc(sizeof(*e));
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e->context = ac;
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e->loop = loop;
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e->fd = c->fd;
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e->reading = e->writing = 0;
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/* Register functions to start/stop listening for events */
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ac->ev.addRead = redisAeAddRead;
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ac->ev.delRead = redisAeDelRead;
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ac->ev.addWrite = redisAeAddWrite;
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ac->ev.delWrite = redisAeDelWrite;
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ac->ev.cleanup = redisAeCleanup;
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ac->ev.data = e;
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return C_OK;
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}
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/* ============================= Prototypes ================================= */
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void sentinelLinkEstablishedCallback(const redisAsyncContext *c, int status);
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void sentinelDisconnectCallback(const redisAsyncContext *c, int status);
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void sentinelReceiveHelloMessages(redisAsyncContext *c, void *reply, void *privdata);
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sentinelRedisInstance *sentinelGetMasterByName(char *name);
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char *sentinelGetSubjectiveLeader(sentinelRedisInstance *master);
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char *sentinelGetObjectiveLeader(sentinelRedisInstance *master);
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void instanceLinkConnectionError(const redisAsyncContext *c);
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const char *sentinelRedisInstanceTypeStr(sentinelRedisInstance *ri);
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void sentinelAbortFailover(sentinelRedisInstance *ri);
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void sentinelEvent(int level, char *type, sentinelRedisInstance *ri, const char *fmt, ...);
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sentinelRedisInstance *sentinelSelectSlave(sentinelRedisInstance *master);
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void sentinelScheduleScriptExecution(char *path, ...);
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void sentinelStartFailover(sentinelRedisInstance *master);
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void sentinelDiscardReplyCallback(redisAsyncContext *c, void *reply, void *privdata);
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int sentinelSendSlaveOf(sentinelRedisInstance *ri, const sentinelAddr *addr);
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char *sentinelVoteLeader(sentinelRedisInstance *master, uint64_t req_epoch, char *req_runid, uint64_t *leader_epoch);
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int sentinelFlushConfig(void);
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void sentinelGenerateInitialMonitorEvents(void);
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int sentinelSendPing(sentinelRedisInstance *ri);
|
|
int sentinelForceHelloUpdateForMaster(sentinelRedisInstance *master);
|
|
sentinelRedisInstance *getSentinelRedisInstanceByAddrAndRunID(dict *instances, char *ip, int port, char *runid);
|
|
void sentinelSimFailureCrash(void);
|
|
|
|
/* ========================= Dictionary types =============================== */
|
|
|
|
void releaseSentinelRedisInstance(sentinelRedisInstance *ri);
|
|
|
|
void dictInstancesValDestructor (dict *d, void *obj) {
|
|
UNUSED(d);
|
|
releaseSentinelRedisInstance(obj);
|
|
}
|
|
|
|
/* Instance name (sds) -> instance (sentinelRedisInstance pointer)
|
|
*
|
|
* also used for: sentinelRedisInstance->sentinels dictionary that maps
|
|
* sentinels ip:port to last seen time in Pub/Sub hello message. */
|
|
dictType instancesDictType = {
|
|
dictSdsHash, /* hash function */
|
|
NULL, /* key dup */
|
|
NULL, /* val dup */
|
|
dictSdsKeyCompare, /* key compare */
|
|
NULL, /* key destructor */
|
|
dictInstancesValDestructor,/* val destructor */
|
|
NULL /* allow to expand */
|
|
};
|
|
|
|
/* Instance runid (sds) -> votes (long casted to void*)
|
|
*
|
|
* This is useful into sentinelGetObjectiveLeader() function in order to
|
|
* count the votes and understand who is the leader. */
|
|
dictType leaderVotesDictType = {
|
|
dictSdsHash, /* hash function */
|
|
NULL, /* key dup */
|
|
NULL, /* val dup */
|
|
dictSdsKeyCompare, /* key compare */
|
|
NULL, /* key destructor */
|
|
NULL, /* val destructor */
|
|
NULL /* allow to expand */
|
|
};
|
|
|
|
/* Instance renamed commands table. */
|
|
dictType renamedCommandsDictType = {
|
|
dictSdsCaseHash, /* hash function */
|
|
NULL, /* key dup */
|
|
NULL, /* val dup */
|
|
dictSdsKeyCaseCompare, /* key compare */
|
|
dictSdsDestructor, /* key destructor */
|
|
dictSdsDestructor, /* val destructor */
|
|
NULL /* allow to expand */
|
|
};
|
|
|
|
/* =========================== Initialization =============================== */
|
|
|
|
void sentinelSetCommand(client *c);
|
|
void sentinelConfigGetCommand(client *c);
|
|
void sentinelConfigSetCommand(client *c);
|
|
|
|
/* this array is used for sentinel config lookup, which need to be loaded
|
|
* before monitoring masters config to avoid dependency issues */
|
|
const char *preMonitorCfgName[] = {
|
|
"announce-ip",
|
|
"announce-port",
|
|
"deny-scripts-reconfig",
|
|
"sentinel-user",
|
|
"sentinel-pass",
|
|
"current-epoch",
|
|
"myid",
|
|
"resolve-hostnames",
|
|
"announce-hostnames"
|
|
};
|
|
|
|
/* This function overwrites a few normal Redis config default with Sentinel
|
|
* specific defaults. */
|
|
void initSentinelConfig(void) {
|
|
server.port = REDIS_SENTINEL_PORT;
|
|
server.protected_mode = 0; /* Sentinel must be exposed. */
|
|
}
|
|
|
|
void freeSentinelLoadQueueEntry(void *item);
|
|
|
|
/* Perform the Sentinel mode initialization. */
|
|
void initSentinel(void) {
|
|
/* Initialize various data structures. */
|
|
sentinel.current_epoch = 0;
|
|
sentinel.masters = dictCreate(&instancesDictType);
|
|
sentinel.tilt = 0;
|
|
sentinel.tilt_start_time = 0;
|
|
sentinel.previous_time = mstime();
|
|
sentinel.running_scripts = 0;
|
|
sentinel.scripts_queue = listCreate();
|
|
sentinel.announce_ip = NULL;
|
|
sentinel.announce_port = 0;
|
|
sentinel.simfailure_flags = SENTINEL_SIMFAILURE_NONE;
|
|
sentinel.deny_scripts_reconfig = SENTINEL_DEFAULT_DENY_SCRIPTS_RECONFIG;
|
|
sentinel.sentinel_auth_pass = NULL;
|
|
sentinel.sentinel_auth_user = NULL;
|
|
sentinel.resolve_hostnames = SENTINEL_DEFAULT_RESOLVE_HOSTNAMES;
|
|
sentinel.announce_hostnames = SENTINEL_DEFAULT_ANNOUNCE_HOSTNAMES;
|
|
memset(sentinel.myid,0,sizeof(sentinel.myid));
|
|
server.sentinel_config = NULL;
|
|
}
|
|
|
|
/* This function is for checking whether sentinel config file has been set,
|
|
* also checking whether we have write permissions. */
|
|
void sentinelCheckConfigFile(void) {
|
|
if (server.configfile == NULL) {
|
|
serverLog(LL_WARNING,
|
|
"Sentinel needs config file on disk to save state. Exiting...");
|
|
exit(1);
|
|
} else if (access(server.configfile,W_OK) == -1) {
|
|
serverLog(LL_WARNING,
|
|
"Sentinel config file %s is not writable: %s. Exiting...",
|
|
server.configfile,strerror(errno));
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/* This function gets called when the server is in Sentinel mode, started,
|
|
* loaded the configuration, and is ready for normal operations. */
|
|
void sentinelIsRunning(void) {
|
|
int j;
|
|
|
|
/* If this Sentinel has yet no ID set in the configuration file, we
|
|
* pick a random one and persist the config on disk. From now on this
|
|
* will be this Sentinel ID across restarts. */
|
|
for (j = 0; j < CONFIG_RUN_ID_SIZE; j++)
|
|
if (sentinel.myid[j] != 0) break;
|
|
|
|
if (j == CONFIG_RUN_ID_SIZE) {
|
|
/* Pick ID and persist the config. */
|
|
getRandomHexChars(sentinel.myid,CONFIG_RUN_ID_SIZE);
|
|
sentinelFlushConfig();
|
|
}
|
|
|
|
/* Log its ID to make debugging of issues simpler. */
|
|
serverLog(LL_WARNING,"Sentinel ID is %s", sentinel.myid);
|
|
|
|
/* We want to generate a +monitor event for every configured master
|
|
* at startup. */
|
|
sentinelGenerateInitialMonitorEvents();
|
|
}
|
|
|
|
/* ============================== sentinelAddr ============================== */
|
|
|
|
/* Create a sentinelAddr object and return it on success.
|
|
* On error NULL is returned and errno is set to:
|
|
* ENOENT: Can't resolve the hostname, unless accept_unresolved is non-zero.
|
|
* EINVAL: Invalid port number.
|
|
*/
|
|
sentinelAddr *createSentinelAddr(char *hostname, int port, int is_accept_unresolved) {
|
|
char ip[NET_IP_STR_LEN];
|
|
sentinelAddr *sa;
|
|
|
|
if (port < 0 || port > 65535) {
|
|
errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
if (anetResolve(NULL,hostname,ip,sizeof(ip),
|
|
sentinel.resolve_hostnames ? ANET_NONE : ANET_IP_ONLY) == ANET_ERR) {
|
|
serverLog(LL_WARNING, "Failed to resolve hostname '%s'", hostname);
|
|
if (sentinel.resolve_hostnames && is_accept_unresolved) {
|
|
ip[0] = '\0';
|
|
}
|
|
else {
|
|
errno = ENOENT;
|
|
return NULL;
|
|
}
|
|
}
|
|
sa = zmalloc(sizeof(*sa));
|
|
sa->hostname = sdsnew(hostname);
|
|
sa->ip = sdsnew(ip);
|
|
sa->port = port;
|
|
return sa;
|
|
}
|
|
|
|
/* Return a duplicate of the source address. */
|
|
sentinelAddr *dupSentinelAddr(sentinelAddr *src) {
|
|
sentinelAddr *sa;
|
|
|
|
sa = zmalloc(sizeof(*sa));
|
|
sa->hostname = sdsnew(src->hostname);
|
|
sa->ip = sdsnew(src->ip);
|
|
sa->port = src->port;
|
|
return sa;
|
|
}
|
|
|
|
/* Free a Sentinel address. Can't fail. */
|
|
void releaseSentinelAddr(sentinelAddr *sa) {
|
|
sdsfree(sa->hostname);
|
|
sdsfree(sa->ip);
|
|
zfree(sa);
|
|
}
|
|
|
|
/* Return non-zero if two addresses are equal. */
|
|
int sentinelAddrIsEqual(sentinelAddr *a, sentinelAddr *b) {
|
|
return a->port == b->port && !strcasecmp(a->ip,b->ip);
|
|
}
|
|
|
|
/* Return non-zero if the two addresses are equal, either by address
|
|
* or by hostname if they could not have been resolved.
|
|
*/
|
|
int sentinelAddrOrHostnameEqual(sentinelAddr *a, sentinelAddr *b) {
|
|
return a->port == b->port &&
|
|
(!strcmp(a->ip, b->ip) ||
|
|
!strcasecmp(a->hostname, b->hostname));
|
|
}
|
|
|
|
/* Return non-zero if a hostname matches an address. */
|
|
int sentinelAddrEqualsHostname(sentinelAddr *a, char *hostname) {
|
|
char ip[NET_IP_STR_LEN];
|
|
|
|
/* We always resolve the hostname and compare it to the address */
|
|
if (anetResolve(NULL, hostname, ip, sizeof(ip),
|
|
sentinel.resolve_hostnames ? ANET_NONE : ANET_IP_ONLY) == ANET_ERR)
|
|
return 0;
|
|
return !strcasecmp(a->ip, ip);
|
|
}
|
|
|
|
const char *announceSentinelAddr(const sentinelAddr *a) {
|
|
return sentinel.announce_hostnames ? a->hostname : a->ip;
|
|
}
|
|
|
|
/* Return an allocated sds with hostname/address:port. IPv6
|
|
* addresses are bracketed the same way anetFormatAddr() does.
|
|
*/
|
|
sds announceSentinelAddrAndPort(const sentinelAddr *a) {
|
|
const char *addr = announceSentinelAddr(a);
|
|
if (strchr(addr, ':') != NULL)
|
|
return sdscatprintf(sdsempty(), "[%s]:%d", addr, a->port);
|
|
else
|
|
return sdscatprintf(sdsempty(), "%s:%d", addr, a->port);
|
|
}
|
|
|
|
/* =========================== Events notification ========================== */
|
|
|
|
/* Send an event to log, pub/sub, user notification script.
|
|
*
|
|
* 'level' is the log level for logging. Only LL_WARNING events will trigger
|
|
* the execution of the user notification script.
|
|
*
|
|
* 'type' is the message type, also used as a pub/sub channel name.
|
|
*
|
|
* 'ri', is the redis instance target of this event if applicable, and is
|
|
* used to obtain the path of the notification script to execute.
|
|
*
|
|
* The remaining arguments are printf-alike.
|
|
* If the format specifier starts with the two characters "%@" then ri is
|
|
* not NULL, and the message is prefixed with an instance identifier in the
|
|
* following format:
|
|
*
|
|
* <instance type> <instance name> <ip> <port>
|
|
*
|
|
* If the instance type is not master, than the additional string is
|
|
* added to specify the originating master:
|
|
*
|
|
* @ <master name> <master ip> <master port>
|
|
*
|
|
* Any other specifier after "%@" is processed by printf itself.
|
|
*/
|
|
void sentinelEvent(int level, char *type, sentinelRedisInstance *ri,
|
|
const char *fmt, ...) {
|
|
va_list ap;
|
|
char msg[LOG_MAX_LEN];
|
|
robj *channel, *payload;
|
|
|
|
/* Handle %@ */
|
|
if (fmt[0] == '%' && fmt[1] == '@') {
|
|
sentinelRedisInstance *master = (ri->flags & SRI_MASTER) ?
|
|
NULL : ri->master;
|
|
|
|
if (master) {
|
|
snprintf(msg, sizeof(msg), "%s %s %s %d @ %s %s %d",
|
|
sentinelRedisInstanceTypeStr(ri),
|
|
ri->name, announceSentinelAddr(ri->addr), ri->addr->port,
|
|
master->name, announceSentinelAddr(master->addr), master->addr->port);
|
|
} else {
|
|
snprintf(msg, sizeof(msg), "%s %s %s %d",
|
|
sentinelRedisInstanceTypeStr(ri),
|
|
ri->name, announceSentinelAddr(ri->addr), ri->addr->port);
|
|
}
|
|
fmt += 2;
|
|
} else {
|
|
msg[0] = '\0';
|
|
}
|
|
|
|
/* Use vsprintf for the rest of the formatting if any. */
|
|
if (fmt[0] != '\0') {
|
|
va_start(ap, fmt);
|
|
vsnprintf(msg+strlen(msg), sizeof(msg)-strlen(msg), fmt, ap);
|
|
va_end(ap);
|
|
}
|
|
|
|
/* Log the message if the log level allows it to be logged. */
|
|
if (level >= server.verbosity)
|
|
serverLog(level,"%s %s",type,msg);
|
|
|
|
/* Publish the message via Pub/Sub if it's not a debugging one. */
|
|
if (level != LL_DEBUG) {
|
|
channel = createStringObject(type,strlen(type));
|
|
payload = createStringObject(msg,strlen(msg));
|
|
pubsubPublishMessage(channel,payload,0);
|
|
decrRefCount(channel);
|
|
decrRefCount(payload);
|
|
}
|
|
|
|
/* Call the notification script if applicable. */
|
|
if (level == LL_WARNING && ri != NULL) {
|
|
sentinelRedisInstance *master = (ri->flags & SRI_MASTER) ?
|
|
ri : ri->master;
|
|
if (master && master->notification_script) {
|
|
sentinelScheduleScriptExecution(master->notification_script,
|
|
type,msg,NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* This function is called only at startup and is used to generate a
|
|
* +monitor event for every configured master. The same events are also
|
|
* generated when a master to monitor is added at runtime via the
|
|
* SENTINEL MONITOR command. */
|
|
void sentinelGenerateInitialMonitorEvents(void) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
|
|
di = dictGetIterator(sentinel.masters);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
sentinelEvent(LL_WARNING,"+monitor",ri,"%@ quorum %d",ri->quorum);
|
|
}
|
|
dictReleaseIterator(di);
|
|
}
|
|
|
|
/* ============================ script execution ============================ */
|
|
|
|
/* Release a script job structure and all the associated data. */
|
|
void sentinelReleaseScriptJob(sentinelScriptJob *sj) {
|
|
int j = 0;
|
|
|
|
while(sj->argv[j]) sdsfree(sj->argv[j++]);
|
|
zfree(sj->argv);
|
|
zfree(sj);
|
|
}
|
|
|
|
#define SENTINEL_SCRIPT_MAX_ARGS 16
|
|
void sentinelScheduleScriptExecution(char *path, ...) {
|
|
va_list ap;
|
|
char *argv[SENTINEL_SCRIPT_MAX_ARGS+1];
|
|
int argc = 1;
|
|
sentinelScriptJob *sj;
|
|
|
|
va_start(ap, path);
|
|
while(argc < SENTINEL_SCRIPT_MAX_ARGS) {
|
|
argv[argc] = va_arg(ap,char*);
|
|
if (!argv[argc]) break;
|
|
argv[argc] = sdsnew(argv[argc]); /* Copy the string. */
|
|
argc++;
|
|
}
|
|
va_end(ap);
|
|
argv[0] = sdsnew(path);
|
|
|
|
sj = zmalloc(sizeof(*sj));
|
|
sj->flags = SENTINEL_SCRIPT_NONE;
|
|
sj->retry_num = 0;
|
|
sj->argv = zmalloc(sizeof(char*)*(argc+1));
|
|
sj->start_time = 0;
|
|
sj->pid = 0;
|
|
memcpy(sj->argv,argv,sizeof(char*)*(argc+1));
|
|
|
|
listAddNodeTail(sentinel.scripts_queue,sj);
|
|
|
|
/* Remove the oldest non running script if we already hit the limit. */
|
|
if (listLength(sentinel.scripts_queue) > SENTINEL_SCRIPT_MAX_QUEUE) {
|
|
listNode *ln;
|
|
listIter li;
|
|
|
|
listRewind(sentinel.scripts_queue,&li);
|
|
while ((ln = listNext(&li)) != NULL) {
|
|
sj = ln->value;
|
|
|
|
if (sj->flags & SENTINEL_SCRIPT_RUNNING) continue;
|
|
/* The first node is the oldest as we add on tail. */
|
|
listDelNode(sentinel.scripts_queue,ln);
|
|
sentinelReleaseScriptJob(sj);
|
|
break;
|
|
}
|
|
serverAssert(listLength(sentinel.scripts_queue) <=
|
|
SENTINEL_SCRIPT_MAX_QUEUE);
|
|
}
|
|
}
|
|
|
|
/* Lookup a script in the scripts queue via pid, and returns the list node
|
|
* (so that we can easily remove it from the queue if needed). */
|
|
listNode *sentinelGetScriptListNodeByPid(pid_t pid) {
|
|
listNode *ln;
|
|
listIter li;
|
|
|
|
listRewind(sentinel.scripts_queue,&li);
|
|
while ((ln = listNext(&li)) != NULL) {
|
|
sentinelScriptJob *sj = ln->value;
|
|
|
|
if ((sj->flags & SENTINEL_SCRIPT_RUNNING) && sj->pid == pid)
|
|
return ln;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* Run pending scripts if we are not already at max number of running
|
|
* scripts. */
|
|
void sentinelRunPendingScripts(void) {
|
|
listNode *ln;
|
|
listIter li;
|
|
mstime_t now = mstime();
|
|
|
|
/* Find jobs that are not running and run them, from the top to the
|
|
* tail of the queue, so we run older jobs first. */
|
|
listRewind(sentinel.scripts_queue,&li);
|
|
while (sentinel.running_scripts < SENTINEL_SCRIPT_MAX_RUNNING &&
|
|
(ln = listNext(&li)) != NULL)
|
|
{
|
|
sentinelScriptJob *sj = ln->value;
|
|
pid_t pid;
|
|
|
|
/* Skip if already running. */
|
|
if (sj->flags & SENTINEL_SCRIPT_RUNNING) continue;
|
|
|
|
/* Skip if it's a retry, but not enough time has elapsed. */
|
|
if (sj->start_time && sj->start_time > now) continue;
|
|
|
|
sj->flags |= SENTINEL_SCRIPT_RUNNING;
|
|
sj->start_time = mstime();
|
|
sj->retry_num++;
|
|
pid = fork();
|
|
|
|
if (pid == -1) {
|
|
/* Parent (fork error).
|
|
* We report fork errors as signal 99, in order to unify the
|
|
* reporting with other kind of errors. */
|
|
sentinelEvent(LL_WARNING,"-script-error",NULL,
|
|
"%s %d %d", sj->argv[0], 99, 0);
|
|
sj->flags &= ~SENTINEL_SCRIPT_RUNNING;
|
|
sj->pid = 0;
|
|
} else if (pid == 0) {
|
|
/* Child */
|
|
tlsCleanup();
|
|
execve(sj->argv[0],sj->argv,environ);
|
|
/* If we are here an error occurred. */
|
|
_exit(2); /* Don't retry execution. */
|
|
} else {
|
|
sentinel.running_scripts++;
|
|
sj->pid = pid;
|
|
sentinelEvent(LL_DEBUG,"+script-child",NULL,"%ld",(long)pid);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* How much to delay the execution of a script that we need to retry after
|
|
* an error?
|
|
*
|
|
* We double the retry delay for every further retry we do. So for instance
|
|
* if RETRY_DELAY is set to 30 seconds and the max number of retries is 10
|
|
* starting from the second attempt to execute the script the delays are:
|
|
* 30 sec, 60 sec, 2 min, 4 min, 8 min, 16 min, 32 min, 64 min, 128 min. */
|
|
mstime_t sentinelScriptRetryDelay(int retry_num) {
|
|
mstime_t delay = sentinel_script_retry_delay;
|
|
|
|
while (retry_num-- > 1) delay *= 2;
|
|
return delay;
|
|
}
|
|
|
|
/* Check for scripts that terminated, and remove them from the queue if the
|
|
* script terminated successfully. If instead the script was terminated by
|
|
* a signal, or returned exit code "1", it is scheduled to run again if
|
|
* the max number of retries did not already elapsed. */
|
|
void sentinelCollectTerminatedScripts(void) {
|
|
int statloc;
|
|
pid_t pid;
|
|
|
|
while ((pid = waitpid(-1, &statloc, WNOHANG)) > 0) {
|
|
int exitcode = WEXITSTATUS(statloc);
|
|
int bysignal = 0;
|
|
listNode *ln;
|
|
sentinelScriptJob *sj;
|
|
|
|
if (WIFSIGNALED(statloc)) bysignal = WTERMSIG(statloc);
|
|
sentinelEvent(LL_DEBUG,"-script-child",NULL,"%ld %d %d",
|
|
(long)pid, exitcode, bysignal);
|
|
|
|
ln = sentinelGetScriptListNodeByPid(pid);
|
|
if (ln == NULL) {
|
|
serverLog(LL_WARNING,"waitpid() returned a pid (%ld) we can't find in our scripts execution queue!", (long)pid);
|
|
continue;
|
|
}
|
|
sj = ln->value;
|
|
|
|
/* If the script was terminated by a signal or returns an
|
|
* exit code of "1" (that means: please retry), we reschedule it
|
|
* if the max number of retries is not already reached. */
|
|
if ((bysignal || exitcode == 1) &&
|
|
sj->retry_num != SENTINEL_SCRIPT_MAX_RETRY)
|
|
{
|
|
sj->flags &= ~SENTINEL_SCRIPT_RUNNING;
|
|
sj->pid = 0;
|
|
sj->start_time = mstime() +
|
|
sentinelScriptRetryDelay(sj->retry_num);
|
|
} else {
|
|
/* Otherwise let's remove the script, but log the event if the
|
|
* execution did not terminated in the best of the ways. */
|
|
if (bysignal || exitcode != 0) {
|
|
sentinelEvent(LL_WARNING,"-script-error",NULL,
|
|
"%s %d %d", sj->argv[0], bysignal, exitcode);
|
|
}
|
|
listDelNode(sentinel.scripts_queue,ln);
|
|
sentinelReleaseScriptJob(sj);
|
|
}
|
|
sentinel.running_scripts--;
|
|
}
|
|
}
|
|
|
|
/* Kill scripts in timeout, they'll be collected by the
|
|
* sentinelCollectTerminatedScripts() function. */
|
|
void sentinelKillTimedoutScripts(void) {
|
|
listNode *ln;
|
|
listIter li;
|
|
mstime_t now = mstime();
|
|
|
|
listRewind(sentinel.scripts_queue,&li);
|
|
while ((ln = listNext(&li)) != NULL) {
|
|
sentinelScriptJob *sj = ln->value;
|
|
|
|
if (sj->flags & SENTINEL_SCRIPT_RUNNING &&
|
|
(now - sj->start_time) > sentinel_script_max_runtime)
|
|
{
|
|
sentinelEvent(LL_WARNING,"-script-timeout",NULL,"%s %ld",
|
|
sj->argv[0], (long)sj->pid);
|
|
kill(sj->pid,SIGKILL);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Implements SENTINEL PENDING-SCRIPTS command. */
|
|
void sentinelPendingScriptsCommand(client *c) {
|
|
listNode *ln;
|
|
listIter li;
|
|
|
|
addReplyArrayLen(c,listLength(sentinel.scripts_queue));
|
|
listRewind(sentinel.scripts_queue,&li);
|
|
while ((ln = listNext(&li)) != NULL) {
|
|
sentinelScriptJob *sj = ln->value;
|
|
int j = 0;
|
|
|
|
addReplyMapLen(c,5);
|
|
|
|
addReplyBulkCString(c,"argv");
|
|
while (sj->argv[j]) j++;
|
|
addReplyArrayLen(c,j);
|
|
j = 0;
|
|
while (sj->argv[j]) addReplyBulkCString(c,sj->argv[j++]);
|
|
|
|
addReplyBulkCString(c,"flags");
|
|
addReplyBulkCString(c,
|
|
(sj->flags & SENTINEL_SCRIPT_RUNNING) ? "running" : "scheduled");
|
|
|
|
addReplyBulkCString(c,"pid");
|
|
addReplyBulkLongLong(c,sj->pid);
|
|
|
|
if (sj->flags & SENTINEL_SCRIPT_RUNNING) {
|
|
addReplyBulkCString(c,"run-time");
|
|
addReplyBulkLongLong(c,mstime() - sj->start_time);
|
|
} else {
|
|
mstime_t delay = sj->start_time ? (sj->start_time-mstime()) : 0;
|
|
if (delay < 0) delay = 0;
|
|
addReplyBulkCString(c,"run-delay");
|
|
addReplyBulkLongLong(c,delay);
|
|
}
|
|
|
|
addReplyBulkCString(c,"retry-num");
|
|
addReplyBulkLongLong(c,sj->retry_num);
|
|
}
|
|
}
|
|
|
|
/* This function calls, if any, the client reconfiguration script with the
|
|
* following parameters:
|
|
*
|
|
* <master-name> <role> <state> <from-ip> <from-port> <to-ip> <to-port>
|
|
*
|
|
* It is called every time a failover is performed.
|
|
*
|
|
* <state> is currently always "start".
|
|
* <role> is either "leader" or "observer".
|
|
*
|
|
* from/to fields are respectively master -> promoted slave addresses for
|
|
* "start" and "end". */
|
|
void sentinelCallClientReconfScript(sentinelRedisInstance *master, int role, char *state, sentinelAddr *from, sentinelAddr *to) {
|
|
char fromport[32], toport[32];
|
|
|
|
if (master->client_reconfig_script == NULL) return;
|
|
ll2string(fromport,sizeof(fromport),from->port);
|
|
ll2string(toport,sizeof(toport),to->port);
|
|
sentinelScheduleScriptExecution(master->client_reconfig_script,
|
|
master->name,
|
|
(role == SENTINEL_LEADER) ? "leader" : "observer",
|
|
state, announceSentinelAddr(from), fromport,
|
|
announceSentinelAddr(to), toport, NULL);
|
|
}
|
|
|
|
/* =============================== instanceLink ============================= */
|
|
|
|
/* Create a not yet connected link object. */
|
|
instanceLink *createInstanceLink(void) {
|
|
instanceLink *link = zmalloc(sizeof(*link));
|
|
|
|
link->refcount = 1;
|
|
link->disconnected = 1;
|
|
link->pending_commands = 0;
|
|
link->cc = NULL;
|
|
link->pc = NULL;
|
|
link->cc_conn_time = 0;
|
|
link->pc_conn_time = 0;
|
|
link->last_reconn_time = 0;
|
|
link->pc_last_activity = 0;
|
|
/* We set the act_ping_time to "now" even if we actually don't have yet
|
|
* a connection with the node, nor we sent a ping.
|
|
* This is useful to detect a timeout in case we'll not be able to connect
|
|
* with the node at all. */
|
|
link->act_ping_time = mstime();
|
|
link->last_ping_time = 0;
|
|
link->last_avail_time = mstime();
|
|
link->last_pong_time = mstime();
|
|
return link;
|
|
}
|
|
|
|
/* Disconnect a hiredis connection in the context of an instance link. */
|
|
void instanceLinkCloseConnection(instanceLink *link, redisAsyncContext *c) {
|
|
if (c == NULL) return;
|
|
|
|
if (link->cc == c) {
|
|
link->cc = NULL;
|
|
link->pending_commands = 0;
|
|
}
|
|
if (link->pc == c) link->pc = NULL;
|
|
c->data = NULL;
|
|
link->disconnected = 1;
|
|
redisAsyncFree(c);
|
|
}
|
|
|
|
/* Decrement the refcount of a link object, if it drops to zero, actually
|
|
* free it and return NULL. Otherwise don't do anything and return the pointer
|
|
* to the object.
|
|
*
|
|
* If we are not going to free the link and ri is not NULL, we rebind all the
|
|
* pending requests in link->cc (hiredis connection for commands) to a
|
|
* callback that will just ignore them. This is useful to avoid processing
|
|
* replies for an instance that no longer exists. */
|
|
instanceLink *releaseInstanceLink(instanceLink *link, sentinelRedisInstance *ri)
|
|
{
|
|
serverAssert(link->refcount > 0);
|
|
link->refcount--;
|
|
if (link->refcount != 0) {
|
|
if (ri && ri->link->cc) {
|
|
/* This instance may have pending callbacks in the hiredis async
|
|
* context, having as 'privdata' the instance that we are going to
|
|
* free. Let's rewrite the callback list, directly exploiting
|
|
* hiredis internal data structures, in order to bind them with
|
|
* a callback that will ignore the reply at all. */
|
|
redisCallback *cb;
|
|
redisCallbackList *callbacks = &link->cc->replies;
|
|
|
|
cb = callbacks->head;
|
|
while(cb) {
|
|
if (cb->privdata == ri) {
|
|
cb->fn = sentinelDiscardReplyCallback;
|
|
cb->privdata = NULL; /* Not strictly needed. */
|
|
}
|
|
cb = cb->next;
|
|
}
|
|
}
|
|
return link; /* Other active users. */
|
|
}
|
|
|
|
instanceLinkCloseConnection(link,link->cc);
|
|
instanceLinkCloseConnection(link,link->pc);
|
|
zfree(link);
|
|
return NULL;
|
|
}
|
|
|
|
/* This function will attempt to share the instance link we already have
|
|
* for the same Sentinel in the context of a different master, with the
|
|
* instance we are passing as argument.
|
|
*
|
|
* This way multiple Sentinel objects that refer all to the same physical
|
|
* Sentinel instance but in the context of different masters will use
|
|
* a single connection, will send a single PING per second for failure
|
|
* detection and so forth.
|
|
*
|
|
* Return C_OK if a matching Sentinel was found in the context of a
|
|
* different master and sharing was performed. Otherwise C_ERR
|
|
* is returned. */
|
|
int sentinelTryConnectionSharing(sentinelRedisInstance *ri) {
|
|
serverAssert(ri->flags & SRI_SENTINEL);
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
|
|
if (ri->runid == NULL) return C_ERR; /* No way to identify it. */
|
|
if (ri->link->refcount > 1) return C_ERR; /* Already shared. */
|
|
|
|
di = dictGetIterator(sentinel.masters);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *master = dictGetVal(de), *match;
|
|
/* We want to share with the same physical Sentinel referenced
|
|
* in other masters, so skip our master. */
|
|
if (master == ri->master) continue;
|
|
match = getSentinelRedisInstanceByAddrAndRunID(master->sentinels,
|
|
NULL,0,ri->runid);
|
|
if (match == NULL) continue; /* No match. */
|
|
if (match == ri) continue; /* Should never happen but... safer. */
|
|
|
|
/* We identified a matching Sentinel, great! Let's free our link
|
|
* and use the one of the matching Sentinel. */
|
|
releaseInstanceLink(ri->link,NULL);
|
|
ri->link = match->link;
|
|
match->link->refcount++;
|
|
dictReleaseIterator(di);
|
|
return C_OK;
|
|
}
|
|
dictReleaseIterator(di);
|
|
return C_ERR;
|
|
}
|
|
|
|
/* Disconnect the relevant master and its replicas. */
|
|
void dropInstanceConnections(sentinelRedisInstance *ri) {
|
|
serverAssert(ri->flags & SRI_MASTER);
|
|
|
|
/* Disconnect with the master. */
|
|
instanceLinkCloseConnection(ri->link, ri->link->cc);
|
|
instanceLinkCloseConnection(ri->link, ri->link->pc);
|
|
|
|
/* Disconnect with all replicas. */
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
sentinelRedisInstance *repl_ri;
|
|
di = dictGetIterator(ri->slaves);
|
|
while ((de = dictNext(di)) != NULL) {
|
|
repl_ri = dictGetVal(de);
|
|
instanceLinkCloseConnection(repl_ri->link, repl_ri->link->cc);
|
|
instanceLinkCloseConnection(repl_ri->link, repl_ri->link->pc);
|
|
}
|
|
dictReleaseIterator(di);
|
|
}
|
|
|
|
/* Drop all connections to other sentinels. Returns the number of connections
|
|
* dropped.*/
|
|
int sentinelDropConnections(void) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
int dropped = 0;
|
|
|
|
di = dictGetIterator(sentinel.masters);
|
|
while ((de = dictNext(di)) != NULL) {
|
|
dictIterator *sdi;
|
|
dictEntry *sde;
|
|
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
sdi = dictGetIterator(ri->sentinels);
|
|
while ((sde = dictNext(sdi)) != NULL) {
|
|
sentinelRedisInstance *si = dictGetVal(sde);
|
|
if (!si->link->disconnected) {
|
|
instanceLinkCloseConnection(si->link, si->link->pc);
|
|
instanceLinkCloseConnection(si->link, si->link->cc);
|
|
dropped++;
|
|
}
|
|
}
|
|
dictReleaseIterator(sdi);
|
|
}
|
|
dictReleaseIterator(di);
|
|
|
|
return dropped;
|
|
}
|
|
|
|
/* When we detect a Sentinel to switch address (reporting a different IP/port
|
|
* pair in Hello messages), let's update all the matching Sentinels in the
|
|
* context of other masters as well and disconnect the links, so that everybody
|
|
* will be updated.
|
|
*
|
|
* Return the number of updated Sentinel addresses. */
|
|
int sentinelUpdateSentinelAddressInAllMasters(sentinelRedisInstance *ri) {
|
|
serverAssert(ri->flags & SRI_SENTINEL);
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
int reconfigured = 0;
|
|
|
|
di = dictGetIterator(sentinel.masters);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *master = dictGetVal(de), *match;
|
|
match = getSentinelRedisInstanceByAddrAndRunID(master->sentinels,
|
|
NULL,0,ri->runid);
|
|
/* If there is no match, this master does not know about this
|
|
* Sentinel, try with the next one. */
|
|
if (match == NULL) continue;
|
|
|
|
/* Disconnect the old links if connected. */
|
|
if (match->link->cc != NULL)
|
|
instanceLinkCloseConnection(match->link,match->link->cc);
|
|
if (match->link->pc != NULL)
|
|
instanceLinkCloseConnection(match->link,match->link->pc);
|
|
|
|
if (match == ri) continue; /* Address already updated for it. */
|
|
|
|
/* Update the address of the matching Sentinel by copying the address
|
|
* of the Sentinel object that received the address update. */
|
|
releaseSentinelAddr(match->addr);
|
|
match->addr = dupSentinelAddr(ri->addr);
|
|
reconfigured++;
|
|
}
|
|
dictReleaseIterator(di);
|
|
if (reconfigured)
|
|
sentinelEvent(LL_NOTICE,"+sentinel-address-update", ri,
|
|
"%@ %d additional matching instances", reconfigured);
|
|
return reconfigured;
|
|
}
|
|
|
|
/* This function is called when a hiredis connection reported an error.
|
|
* We set it to NULL and mark the link as disconnected so that it will be
|
|
* reconnected again.
|
|
*
|
|
* Note: we don't free the hiredis context as hiredis will do it for us
|
|
* for async connections. */
|
|
void instanceLinkConnectionError(const redisAsyncContext *c) {
|
|
instanceLink *link = c->data;
|
|
int pubsub;
|
|
|
|
if (!link) return;
|
|
|
|
pubsub = (link->pc == c);
|
|
if (pubsub)
|
|
link->pc = NULL;
|
|
else
|
|
link->cc = NULL;
|
|
link->disconnected = 1;
|
|
}
|
|
|
|
/* Hiredis connection established / disconnected callbacks. We need them
|
|
* just to cleanup our link state. */
|
|
void sentinelLinkEstablishedCallback(const redisAsyncContext *c, int status) {
|
|
if (status != C_OK) instanceLinkConnectionError(c);
|
|
}
|
|
|
|
void sentinelDisconnectCallback(const redisAsyncContext *c, int status) {
|
|
UNUSED(status);
|
|
instanceLinkConnectionError(c);
|
|
}
|
|
|
|
/* ========================== sentinelRedisInstance ========================= */
|
|
|
|
/* Create a redis instance, the following fields must be populated by the
|
|
* caller if needed:
|
|
* runid: set to NULL but will be populated once INFO output is received.
|
|
* info_refresh: is set to 0 to mean that we never received INFO so far.
|
|
*
|
|
* If SRI_MASTER is set into initial flags the instance is added to
|
|
* sentinel.masters table.
|
|
*
|
|
* if SRI_SLAVE or SRI_SENTINEL is set then 'master' must be not NULL and the
|
|
* instance is added into master->slaves or master->sentinels table.
|
|
*
|
|
* If the instance is a slave, the name parameter is ignored and is created
|
|
* automatically as ip/hostname:port.
|
|
*
|
|
* The function fails if hostname can't be resolved or port is out of range.
|
|
* When this happens NULL is returned and errno is set accordingly to the
|
|
* createSentinelAddr() function.
|
|
*
|
|
* The function may also fail and return NULL with errno set to EBUSY if
|
|
* a master with the same name, a slave with the same address, or a sentinel
|
|
* with the same ID already exists. */
|
|
|
|
sentinelRedisInstance *createSentinelRedisInstance(char *name, int flags, char *hostname, int port, int quorum, sentinelRedisInstance *master) {
|
|
sentinelRedisInstance *ri;
|
|
sentinelAddr *addr;
|
|
dict *table = NULL;
|
|
sds sdsname;
|
|
|
|
serverAssert(flags & (SRI_MASTER|SRI_SLAVE|SRI_SENTINEL));
|
|
serverAssert((flags & SRI_MASTER) || master != NULL);
|
|
|
|
/* Check address validity. */
|
|
addr = createSentinelAddr(hostname,port,1);
|
|
if (addr == NULL) return NULL;
|
|
|
|
/* For slaves use ip/host:port as name. */
|
|
if (flags & SRI_SLAVE)
|
|
sdsname = announceSentinelAddrAndPort(addr);
|
|
else
|
|
sdsname = sdsnew(name);
|
|
|
|
/* Make sure the entry is not duplicated. This may happen when the same
|
|
* name for a master is used multiple times inside the configuration or
|
|
* if we try to add multiple times a slave or sentinel with same ip/port
|
|
* to a master. */
|
|
if (flags & SRI_MASTER) table = sentinel.masters;
|
|
else if (flags & SRI_SLAVE) table = master->slaves;
|
|
else if (flags & SRI_SENTINEL) table = master->sentinels;
|
|
if (dictFind(table,sdsname)) {
|
|
releaseSentinelAddr(addr);
|
|
sdsfree(sdsname);
|
|
errno = EBUSY;
|
|
return NULL;
|
|
}
|
|
|
|
/* Create the instance object. */
|
|
ri = zmalloc(sizeof(*ri));
|
|
/* Note that all the instances are started in the disconnected state,
|
|
* the event loop will take care of connecting them. */
|
|
ri->flags = flags;
|
|
ri->name = sdsname;
|
|
ri->runid = NULL;
|
|
ri->config_epoch = 0;
|
|
ri->addr = addr;
|
|
ri->link = createInstanceLink();
|
|
ri->last_pub_time = mstime();
|
|
ri->last_hello_time = mstime();
|
|
ri->last_master_down_reply_time = mstime();
|
|
ri->s_down_since_time = 0;
|
|
ri->o_down_since_time = 0;
|
|
ri->down_after_period = master ? master->down_after_period : sentinel_default_down_after;
|
|
ri->master_reboot_down_after_period = 0;
|
|
ri->master_link_down_time = 0;
|
|
ri->auth_pass = NULL;
|
|
ri->auth_user = NULL;
|
|
ri->slave_priority = SENTINEL_DEFAULT_SLAVE_PRIORITY;
|
|
ri->replica_announced = 1;
|
|
ri->slave_reconf_sent_time = 0;
|
|
ri->slave_master_host = NULL;
|
|
ri->slave_master_port = 0;
|
|
ri->slave_master_link_status = SENTINEL_MASTER_LINK_STATUS_DOWN;
|
|
ri->slave_repl_offset = 0;
|
|
ri->sentinels = dictCreate(&instancesDictType);
|
|
ri->quorum = quorum;
|
|
ri->parallel_syncs = SENTINEL_DEFAULT_PARALLEL_SYNCS;
|
|
ri->master = master;
|
|
ri->slaves = dictCreate(&instancesDictType);
|
|
ri->info_refresh = 0;
|
|
ri->renamed_commands = dictCreate(&renamedCommandsDictType);
|
|
|
|
/* Failover state. */
|
|
ri->leader = NULL;
|
|
ri->leader_epoch = 0;
|
|
ri->failover_epoch = 0;
|
|
ri->failover_state = SENTINEL_FAILOVER_STATE_NONE;
|
|
ri->failover_state_change_time = 0;
|
|
ri->failover_start_time = 0;
|
|
ri->failover_timeout = sentinel_default_failover_timeout;
|
|
ri->failover_delay_logged = 0;
|
|
ri->promoted_slave = NULL;
|
|
ri->notification_script = NULL;
|
|
ri->client_reconfig_script = NULL;
|
|
ri->info = NULL;
|
|
|
|
/* Role */
|
|
ri->role_reported = ri->flags & (SRI_MASTER|SRI_SLAVE);
|
|
ri->role_reported_time = mstime();
|
|
ri->slave_conf_change_time = mstime();
|
|
|
|
/* Add into the right table. */
|
|
dictAdd(table, ri->name, ri);
|
|
return ri;
|
|
}
|
|
|
|
/* Release this instance and all its slaves, sentinels, hiredis connections.
|
|
* This function does not take care of unlinking the instance from the main
|
|
* masters table (if it is a master) or from its master sentinels/slaves table
|
|
* if it is a slave or sentinel. */
|
|
void releaseSentinelRedisInstance(sentinelRedisInstance *ri) {
|
|
/* Release all its slaves or sentinels if any. */
|
|
dictRelease(ri->sentinels);
|
|
dictRelease(ri->slaves);
|
|
|
|
/* Disconnect the instance. */
|
|
releaseInstanceLink(ri->link,ri);
|
|
|
|
/* Free other resources. */
|
|
sdsfree(ri->name);
|
|
sdsfree(ri->runid);
|
|
sdsfree(ri->notification_script);
|
|
sdsfree(ri->client_reconfig_script);
|
|
sdsfree(ri->slave_master_host);
|
|
sdsfree(ri->leader);
|
|
sdsfree(ri->auth_pass);
|
|
sdsfree(ri->auth_user);
|
|
sdsfree(ri->info);
|
|
releaseSentinelAddr(ri->addr);
|
|
dictRelease(ri->renamed_commands);
|
|
|
|
/* Clear state into the master if needed. */
|
|
if ((ri->flags & SRI_SLAVE) && (ri->flags & SRI_PROMOTED) && ri->master)
|
|
ri->master->promoted_slave = NULL;
|
|
|
|
zfree(ri);
|
|
}
|
|
|
|
/* Lookup a slave in a master Redis instance, by ip and port. */
|
|
sentinelRedisInstance *sentinelRedisInstanceLookupSlave(
|
|
sentinelRedisInstance *ri, char *slave_addr, int port)
|
|
{
|
|
sds key;
|
|
sentinelRedisInstance *slave;
|
|
sentinelAddr *addr;
|
|
|
|
serverAssert(ri->flags & SRI_MASTER);
|
|
|
|
/* We need to handle a slave_addr that is potentially a hostname.
|
|
* If that is the case, depending on configuration we either resolve
|
|
* it and use the IP address or fail.
|
|
*/
|
|
addr = createSentinelAddr(slave_addr, port, 0);
|
|
if (!addr) return NULL;
|
|
key = announceSentinelAddrAndPort(addr);
|
|
releaseSentinelAddr(addr);
|
|
|
|
slave = dictFetchValue(ri->slaves,key);
|
|
sdsfree(key);
|
|
return slave;
|
|
}
|
|
|
|
/* Return the name of the type of the instance as a string. */
|
|
const char *sentinelRedisInstanceTypeStr(sentinelRedisInstance *ri) {
|
|
if (ri->flags & SRI_MASTER) return "master";
|
|
else if (ri->flags & SRI_SLAVE) return "slave";
|
|
else if (ri->flags & SRI_SENTINEL) return "sentinel";
|
|
else return "unknown";
|
|
}
|
|
|
|
/* This function remove the Sentinel with the specified ID from the
|
|
* specified master.
|
|
*
|
|
* If "runid" is NULL the function returns ASAP.
|
|
*
|
|
* This function is useful because on Sentinels address switch, we want to
|
|
* remove our old entry and add a new one for the same ID but with the new
|
|
* address.
|
|
*
|
|
* The function returns 1 if the matching Sentinel was removed, otherwise
|
|
* 0 if there was no Sentinel with this ID. */
|
|
int removeMatchingSentinelFromMaster(sentinelRedisInstance *master, char *runid) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
int removed = 0;
|
|
|
|
if (runid == NULL) return 0;
|
|
|
|
di = dictGetSafeIterator(master->sentinels);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
|
|
if (ri->runid && strcmp(ri->runid,runid) == 0) {
|
|
dictDelete(master->sentinels,ri->name);
|
|
removed++;
|
|
}
|
|
}
|
|
dictReleaseIterator(di);
|
|
return removed;
|
|
}
|
|
|
|
/* Search an instance with the same runid, ip and port into a dictionary
|
|
* of instances. Return NULL if not found, otherwise return the instance
|
|
* pointer.
|
|
*
|
|
* runid or addr can be NULL. In such a case the search is performed only
|
|
* by the non-NULL field. */
|
|
sentinelRedisInstance *getSentinelRedisInstanceByAddrAndRunID(dict *instances, char *addr, int port, char *runid) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
sentinelRedisInstance *instance = NULL;
|
|
sentinelAddr *ri_addr = NULL;
|
|
|
|
serverAssert(addr || runid); /* User must pass at least one search param. */
|
|
if (addr != NULL) {
|
|
/* Try to resolve addr. If hostnames are used, we're accepting an ri_addr
|
|
* that contains an hostname only and can still be matched based on that.
|
|
*/
|
|
ri_addr = createSentinelAddr(addr,port,1);
|
|
if (!ri_addr) return NULL;
|
|
}
|
|
di = dictGetIterator(instances);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
|
|
if (runid && !ri->runid) continue;
|
|
if ((runid == NULL || strcmp(ri->runid, runid) == 0) &&
|
|
(addr == NULL || sentinelAddrOrHostnameEqual(ri->addr, ri_addr)))
|
|
{
|
|
instance = ri;
|
|
break;
|
|
}
|
|
}
|
|
dictReleaseIterator(di);
|
|
if (ri_addr != NULL)
|
|
releaseSentinelAddr(ri_addr);
|
|
|
|
return instance;
|
|
}
|
|
|
|
/* Master lookup by name */
|
|
sentinelRedisInstance *sentinelGetMasterByName(char *name) {
|
|
sentinelRedisInstance *ri;
|
|
sds sdsname = sdsnew(name);
|
|
|
|
ri = dictFetchValue(sentinel.masters,sdsname);
|
|
sdsfree(sdsname);
|
|
return ri;
|
|
}
|
|
|
|
/* Reset the state of a monitored master:
|
|
* 1) Remove all slaves.
|
|
* 2) Remove all sentinels.
|
|
* 3) Remove most of the flags resulting from runtime operations.
|
|
* 4) Reset timers to their default value. For example after a reset it will be
|
|
* possible to failover again the same master ASAP, without waiting the
|
|
* failover timeout delay.
|
|
* 5) In the process of doing this undo the failover if in progress.
|
|
* 6) Disconnect the connections with the master (will reconnect automatically).
|
|
*/
|
|
|
|
#define SENTINEL_RESET_NO_SENTINELS (1<<0)
|
|
void sentinelResetMaster(sentinelRedisInstance *ri, int flags) {
|
|
serverAssert(ri->flags & SRI_MASTER);
|
|
dictRelease(ri->slaves);
|
|
ri->slaves = dictCreate(&instancesDictType);
|
|
if (!(flags & SENTINEL_RESET_NO_SENTINELS)) {
|
|
dictRelease(ri->sentinels);
|
|
ri->sentinels = dictCreate(&instancesDictType);
|
|
}
|
|
instanceLinkCloseConnection(ri->link,ri->link->cc);
|
|
instanceLinkCloseConnection(ri->link,ri->link->pc);
|
|
ri->flags &= SRI_MASTER;
|
|
if (ri->leader) {
|
|
sdsfree(ri->leader);
|
|
ri->leader = NULL;
|
|
}
|
|
ri->failover_state = SENTINEL_FAILOVER_STATE_NONE;
|
|
ri->failover_state_change_time = 0;
|
|
ri->failover_start_time = 0; /* We can failover again ASAP. */
|
|
ri->promoted_slave = NULL;
|
|
sdsfree(ri->runid);
|
|
sdsfree(ri->slave_master_host);
|
|
ri->runid = NULL;
|
|
ri->slave_master_host = NULL;
|
|
ri->link->act_ping_time = mstime();
|
|
ri->link->last_ping_time = 0;
|
|
ri->link->last_avail_time = mstime();
|
|
ri->link->last_pong_time = mstime();
|
|
ri->role_reported_time = mstime();
|
|
ri->role_reported = SRI_MASTER;
|
|
if (flags & SENTINEL_GENERATE_EVENT)
|
|
sentinelEvent(LL_WARNING,"+reset-master",ri,"%@");
|
|
}
|
|
|
|
/* Call sentinelResetMaster() on every master with a name matching the specified
|
|
* pattern. */
|
|
int sentinelResetMastersByPattern(char *pattern, int flags) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
int reset = 0;
|
|
|
|
di = dictGetIterator(sentinel.masters);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
|
|
if (ri->name) {
|
|
if (stringmatch(pattern,ri->name,0)) {
|
|
sentinelResetMaster(ri,flags);
|
|
reset++;
|
|
}
|
|
}
|
|
}
|
|
dictReleaseIterator(di);
|
|
return reset;
|
|
}
|
|
|
|
/* Reset the specified master with sentinelResetMaster(), and also change
|
|
* the ip:port address, but take the name of the instance unmodified.
|
|
*
|
|
* This is used to handle the +switch-master event.
|
|
*
|
|
* The function returns C_ERR if the address can't be resolved for some
|
|
* reason. Otherwise C_OK is returned. */
|
|
int sentinelResetMasterAndChangeAddress(sentinelRedisInstance *master, char *hostname, int port) {
|
|
sentinelAddr *oldaddr, *newaddr;
|
|
sentinelAddr **slaves = NULL;
|
|
int numslaves = 0, j;
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
|
|
newaddr = createSentinelAddr(hostname,port,0);
|
|
if (newaddr == NULL) return C_ERR;
|
|
|
|
/* There can be only 0 or 1 slave that has the newaddr.
|
|
* and It can add old master 1 more slave.
|
|
* so It allocates dictSize(master->slaves) + 1 */
|
|
slaves = zmalloc(sizeof(sentinelAddr*)*(dictSize(master->slaves) + 1));
|
|
|
|
/* Don't include the one having the address we are switching to. */
|
|
di = dictGetIterator(master->slaves);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *slave = dictGetVal(de);
|
|
|
|
if (sentinelAddrIsEqual(slave->addr,newaddr)) continue;
|
|
slaves[numslaves++] = dupSentinelAddr(slave->addr);
|
|
}
|
|
dictReleaseIterator(di);
|
|
|
|
/* If we are switching to a different address, include the old address
|
|
* as a slave as well, so that we'll be able to sense / reconfigure
|
|
* the old master. */
|
|
if (!sentinelAddrIsEqual(newaddr,master->addr)) {
|
|
slaves[numslaves++] = dupSentinelAddr(master->addr);
|
|
}
|
|
|
|
/* Reset and switch address. */
|
|
sentinelResetMaster(master,SENTINEL_RESET_NO_SENTINELS);
|
|
oldaddr = master->addr;
|
|
master->addr = newaddr;
|
|
master->o_down_since_time = 0;
|
|
master->s_down_since_time = 0;
|
|
|
|
/* Add slaves back. */
|
|
for (j = 0; j < numslaves; j++) {
|
|
sentinelRedisInstance *slave;
|
|
|
|
slave = createSentinelRedisInstance(NULL,SRI_SLAVE,slaves[j]->hostname,
|
|
slaves[j]->port, master->quorum, master);
|
|
releaseSentinelAddr(slaves[j]);
|
|
if (slave) sentinelEvent(LL_NOTICE,"+slave",slave,"%@");
|
|
}
|
|
zfree(slaves);
|
|
|
|
/* Release the old address at the end so we are safe even if the function
|
|
* gets the master->addr->ip and master->addr->port as arguments. */
|
|
releaseSentinelAddr(oldaddr);
|
|
sentinelFlushConfig();
|
|
return C_OK;
|
|
}
|
|
|
|
/* Return non-zero if there was no SDOWN or ODOWN error associated to this
|
|
* instance in the latest 'ms' milliseconds. */
|
|
int sentinelRedisInstanceNoDownFor(sentinelRedisInstance *ri, mstime_t ms) {
|
|
mstime_t most_recent;
|
|
|
|
most_recent = ri->s_down_since_time;
|
|
if (ri->o_down_since_time > most_recent)
|
|
most_recent = ri->o_down_since_time;
|
|
return most_recent == 0 || (mstime() - most_recent) > ms;
|
|
}
|
|
|
|
/* Return the current master address, that is, its address or the address
|
|
* of the promoted slave if already operational. */
|
|
sentinelAddr *sentinelGetCurrentMasterAddress(sentinelRedisInstance *master) {
|
|
/* If we are failing over the master, and the state is already
|
|
* SENTINEL_FAILOVER_STATE_RECONF_SLAVES or greater, it means that we
|
|
* already have the new configuration epoch in the master, and the
|
|
* slave acknowledged the configuration switch. Advertise the new
|
|
* address. */
|
|
if ((master->flags & SRI_FAILOVER_IN_PROGRESS) &&
|
|
master->promoted_slave &&
|
|
master->failover_state >= SENTINEL_FAILOVER_STATE_RECONF_SLAVES)
|
|
{
|
|
return master->promoted_slave->addr;
|
|
} else {
|
|
return master->addr;
|
|
}
|
|
}
|
|
|
|
/* This function sets the down_after_period field value in 'master' to all
|
|
* the slaves and sentinel instances connected to this master. */
|
|
void sentinelPropagateDownAfterPeriod(sentinelRedisInstance *master) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
int j;
|
|
dict *d[] = {master->slaves, master->sentinels, NULL};
|
|
|
|
for (j = 0; d[j]; j++) {
|
|
di = dictGetIterator(d[j]);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
ri->down_after_period = master->down_after_period;
|
|
}
|
|
dictReleaseIterator(di);
|
|
}
|
|
}
|
|
|
|
/* This function is used in order to send commands to Redis instances: the
|
|
* commands we send from Sentinel may be renamed, a common case is a master
|
|
* with CONFIG and SLAVEOF commands renamed for security concerns. In that
|
|
* case we check the ri->renamed_command table (or if the instance is a slave,
|
|
* we check the one of the master), and map the command that we should send
|
|
* to the set of renamed commands. However, if the command was not renamed,
|
|
* we just return "command" itself. */
|
|
char *sentinelInstanceMapCommand(sentinelRedisInstance *ri, char *command) {
|
|
sds sc = sdsnew(command);
|
|
if (ri->master) ri = ri->master;
|
|
char *retval = dictFetchValue(ri->renamed_commands, sc);
|
|
sdsfree(sc);
|
|
return retval ? retval : command;
|
|
}
|
|
|
|
/* ============================ Config handling ============================= */
|
|
|
|
/* Generalise handling create instance error. Use SRI_MASTER, SRI_SLAVE or
|
|
* SRI_SENTINEL as a role value. */
|
|
const char *sentinelCheckCreateInstanceErrors(int role) {
|
|
switch(errno) {
|
|
case EBUSY:
|
|
switch (role) {
|
|
case SRI_MASTER:
|
|
return "Duplicate master name.";
|
|
case SRI_SLAVE:
|
|
return "Duplicate hostname and port for replica.";
|
|
case SRI_SENTINEL:
|
|
return "Duplicate runid for sentinel.";
|
|
default:
|
|
serverAssert(0);
|
|
break;
|
|
}
|
|
break;
|
|
case ENOENT:
|
|
return "Can't resolve instance hostname.";
|
|
case EINVAL:
|
|
return "Invalid port number.";
|
|
default:
|
|
return "Unknown Error for creating instances.";
|
|
}
|
|
}
|
|
|
|
/* init function for server.sentinel_config */
|
|
void initializeSentinelConfig() {
|
|
server.sentinel_config = zmalloc(sizeof(struct sentinelConfig));
|
|
server.sentinel_config->monitor_cfg = listCreate();
|
|
server.sentinel_config->pre_monitor_cfg = listCreate();
|
|
server.sentinel_config->post_monitor_cfg = listCreate();
|
|
listSetFreeMethod(server.sentinel_config->monitor_cfg,freeSentinelLoadQueueEntry);
|
|
listSetFreeMethod(server.sentinel_config->pre_monitor_cfg,freeSentinelLoadQueueEntry);
|
|
listSetFreeMethod(server.sentinel_config->post_monitor_cfg,freeSentinelLoadQueueEntry);
|
|
}
|
|
|
|
/* destroy function for server.sentinel_config */
|
|
void freeSentinelConfig() {
|
|
/* release these three config queues since we will not use it anymore */
|
|
listRelease(server.sentinel_config->pre_monitor_cfg);
|
|
listRelease(server.sentinel_config->monitor_cfg);
|
|
listRelease(server.sentinel_config->post_monitor_cfg);
|
|
zfree(server.sentinel_config);
|
|
server.sentinel_config = NULL;
|
|
}
|
|
|
|
/* Search config name in pre monitor config name array, return 1 if found,
|
|
* 0 if not found. */
|
|
int searchPreMonitorCfgName(const char *name) {
|
|
for (unsigned int i = 0; i < sizeof(preMonitorCfgName)/sizeof(preMonitorCfgName[0]); i++) {
|
|
if (!strcasecmp(preMonitorCfgName[i],name)) return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* free method for sentinelLoadQueueEntry when release the list */
|
|
void freeSentinelLoadQueueEntry(void *item) {
|
|
struct sentinelLoadQueueEntry *entry = item;
|
|
sdsfreesplitres(entry->argv,entry->argc);
|
|
sdsfree(entry->line);
|
|
zfree(entry);
|
|
}
|
|
|
|
/* This function is used for queuing sentinel configuration, the main
|
|
* purpose of this function is to delay parsing the sentinel config option
|
|
* in order to avoid the order dependent issue from the config. */
|
|
void queueSentinelConfig(sds *argv, int argc, int linenum, sds line) {
|
|
int i;
|
|
struct sentinelLoadQueueEntry *entry;
|
|
|
|
/* initialize sentinel_config for the first call */
|
|
if (server.sentinel_config == NULL) initializeSentinelConfig();
|
|
|
|
entry = zmalloc(sizeof(struct sentinelLoadQueueEntry));
|
|
entry->argv = zmalloc(sizeof(char*)*argc);
|
|
entry->argc = argc;
|
|
entry->linenum = linenum;
|
|
entry->line = sdsdup(line);
|
|
for (i = 0; i < argc; i++) {
|
|
entry->argv[i] = sdsdup(argv[i]);
|
|
}
|
|
/* Separate config lines with pre monitor config, monitor config and
|
|
* post monitor config, in order to parsing config dependencies
|
|
* correctly. */
|
|
if (!strcasecmp(argv[0],"monitor")) {
|
|
listAddNodeTail(server.sentinel_config->monitor_cfg,entry);
|
|
} else if (searchPreMonitorCfgName(argv[0])) {
|
|
listAddNodeTail(server.sentinel_config->pre_monitor_cfg,entry);
|
|
} else{
|
|
listAddNodeTail(server.sentinel_config->post_monitor_cfg,entry);
|
|
}
|
|
}
|
|
|
|
/* This function is used for loading the sentinel configuration from
|
|
* pre_monitor_cfg, monitor_cfg and post_monitor_cfg list */
|
|
void loadSentinelConfigFromQueue(void) {
|
|
const char *err = NULL;
|
|
listIter li;
|
|
listNode *ln;
|
|
int linenum = 0;
|
|
sds line = NULL;
|
|
unsigned int j;
|
|
|
|
/* if there is no sentinel_config entry, we can return immediately */
|
|
if (server.sentinel_config == NULL) return;
|
|
|
|
list *sentinel_configs[3] = {
|
|
server.sentinel_config->pre_monitor_cfg,
|
|
server.sentinel_config->monitor_cfg,
|
|
server.sentinel_config->post_monitor_cfg
|
|
};
|
|
/* loading from pre monitor config queue first to avoid dependency issues
|
|
* loading from monitor config queue
|
|
* loading from the post monitor config queue */
|
|
for (j = 0; j < sizeof(sentinel_configs) / sizeof(sentinel_configs[0]); j++) {
|
|
listRewind(sentinel_configs[j],&li);
|
|
while((ln = listNext(&li))) {
|
|
struct sentinelLoadQueueEntry *entry = ln->value;
|
|
err = sentinelHandleConfiguration(entry->argv,entry->argc);
|
|
if (err) {
|
|
linenum = entry->linenum;
|
|
line = entry->line;
|
|
goto loaderr;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* free sentinel_config when config loading is finished */
|
|
freeSentinelConfig();
|
|
return;
|
|
|
|
loaderr:
|
|
fprintf(stderr, "\n*** FATAL CONFIG FILE ERROR (Redis %s) ***\n",
|
|
REDIS_VERSION);
|
|
fprintf(stderr, "Reading the configuration file, at line %d\n", linenum);
|
|
fprintf(stderr, ">>> '%s'\n", line);
|
|
fprintf(stderr, "%s\n", err);
|
|
exit(1);
|
|
}
|
|
|
|
const char *sentinelHandleConfiguration(char **argv, int argc) {
|
|
|
|
sentinelRedisInstance *ri;
|
|
|
|
if (!strcasecmp(argv[0],"monitor") && argc == 5) {
|
|
/* monitor <name> <host> <port> <quorum> */
|
|
int quorum = atoi(argv[4]);
|
|
|
|
if (quorum <= 0) return "Quorum must be 1 or greater.";
|
|
if (createSentinelRedisInstance(argv[1],SRI_MASTER,argv[2],
|
|
atoi(argv[3]),quorum,NULL) == NULL)
|
|
{
|
|
return sentinelCheckCreateInstanceErrors(SRI_MASTER);
|
|
}
|
|
} else if (!strcasecmp(argv[0],"down-after-milliseconds") && argc == 3) {
|
|
/* down-after-milliseconds <name> <milliseconds> */
|
|
ri = sentinelGetMasterByName(argv[1]);
|
|
if (!ri) return "No such master with specified name.";
|
|
ri->down_after_period = atoi(argv[2]);
|
|
if (ri->down_after_period <= 0)
|
|
return "negative or zero time parameter.";
|
|
sentinelPropagateDownAfterPeriod(ri);
|
|
} else if (!strcasecmp(argv[0],"failover-timeout") && argc == 3) {
|
|
/* failover-timeout <name> <milliseconds> */
|
|
ri = sentinelGetMasterByName(argv[1]);
|
|
if (!ri) return "No such master with specified name.";
|
|
ri->failover_timeout = atoi(argv[2]);
|
|
if (ri->failover_timeout <= 0)
|
|
return "negative or zero time parameter.";
|
|
} else if (!strcasecmp(argv[0],"parallel-syncs") && argc == 3) {
|
|
/* parallel-syncs <name> <milliseconds> */
|
|
ri = sentinelGetMasterByName(argv[1]);
|
|
if (!ri) return "No such master with specified name.";
|
|
ri->parallel_syncs = atoi(argv[2]);
|
|
} else if (!strcasecmp(argv[0],"notification-script") && argc == 3) {
|
|
/* notification-script <name> <path> */
|
|
ri = sentinelGetMasterByName(argv[1]);
|
|
if (!ri) return "No such master with specified name.";
|
|
if (access(argv[2],X_OK) == -1)
|
|
return "Notification script seems non existing or non executable.";
|
|
ri->notification_script = sdsnew(argv[2]);
|
|
} else if (!strcasecmp(argv[0],"client-reconfig-script") && argc == 3) {
|
|
/* client-reconfig-script <name> <path> */
|
|
ri = sentinelGetMasterByName(argv[1]);
|
|
if (!ri) return "No such master with specified name.";
|
|
if (access(argv[2],X_OK) == -1)
|
|
return "Client reconfiguration script seems non existing or "
|
|
"non executable.";
|
|
ri->client_reconfig_script = sdsnew(argv[2]);
|
|
} else if (!strcasecmp(argv[0],"auth-pass") && argc == 3) {
|
|
/* auth-pass <name> <password> */
|
|
ri = sentinelGetMasterByName(argv[1]);
|
|
if (!ri) return "No such master with specified name.";
|
|
ri->auth_pass = sdsnew(argv[2]);
|
|
} else if (!strcasecmp(argv[0],"auth-user") && argc == 3) {
|
|
/* auth-user <name> <username> */
|
|
ri = sentinelGetMasterByName(argv[1]);
|
|
if (!ri) return "No such master with specified name.";
|
|
ri->auth_user = sdsnew(argv[2]);
|
|
} else if (!strcasecmp(argv[0],"current-epoch") && argc == 2) {
|
|
/* current-epoch <epoch> */
|
|
unsigned long long current_epoch = strtoull(argv[1],NULL,10);
|
|
if (current_epoch > sentinel.current_epoch)
|
|
sentinel.current_epoch = current_epoch;
|
|
} else if (!strcasecmp(argv[0],"myid") && argc == 2) {
|
|
if (strlen(argv[1]) != CONFIG_RUN_ID_SIZE)
|
|
return "Malformed Sentinel id in myid option.";
|
|
memcpy(sentinel.myid,argv[1],CONFIG_RUN_ID_SIZE);
|
|
} else if (!strcasecmp(argv[0],"config-epoch") && argc == 3) {
|
|
/* config-epoch <name> <epoch> */
|
|
ri = sentinelGetMasterByName(argv[1]);
|
|
if (!ri) return "No such master with specified name.";
|
|
ri->config_epoch = strtoull(argv[2],NULL,10);
|
|
/* The following update of current_epoch is not really useful as
|
|
* now the current epoch is persisted on the config file, but
|
|
* we leave this check here for redundancy. */
|
|
if (ri->config_epoch > sentinel.current_epoch)
|
|
sentinel.current_epoch = ri->config_epoch;
|
|
} else if (!strcasecmp(argv[0],"leader-epoch") && argc == 3) {
|
|
/* leader-epoch <name> <epoch> */
|
|
ri = sentinelGetMasterByName(argv[1]);
|
|
if (!ri) return "No such master with specified name.";
|
|
ri->leader_epoch = strtoull(argv[2],NULL,10);
|
|
} else if ((!strcasecmp(argv[0],"known-slave") ||
|
|
!strcasecmp(argv[0],"known-replica")) && argc == 4)
|
|
{
|
|
sentinelRedisInstance *slave;
|
|
|
|
/* known-replica <name> <ip> <port> */
|
|
ri = sentinelGetMasterByName(argv[1]);
|
|
if (!ri) return "No such master with specified name.";
|
|
if ((slave = createSentinelRedisInstance(NULL,SRI_SLAVE,argv[2],
|
|
atoi(argv[3]), ri->quorum, ri)) == NULL)
|
|
{
|
|
return sentinelCheckCreateInstanceErrors(SRI_SLAVE);
|
|
}
|
|
} else if (!strcasecmp(argv[0],"known-sentinel") &&
|
|
(argc == 4 || argc == 5)) {
|
|
sentinelRedisInstance *si;
|
|
|
|
if (argc == 5) { /* Ignore the old form without runid. */
|
|
/* known-sentinel <name> <ip> <port> [runid] */
|
|
ri = sentinelGetMasterByName(argv[1]);
|
|
if (!ri) return "No such master with specified name.";
|
|
if ((si = createSentinelRedisInstance(argv[4],SRI_SENTINEL,argv[2],
|
|
atoi(argv[3]), ri->quorum, ri)) == NULL)
|
|
{
|
|
return sentinelCheckCreateInstanceErrors(SRI_SENTINEL);
|
|
}
|
|
si->runid = sdsnew(argv[4]);
|
|
sentinelTryConnectionSharing(si);
|
|
}
|
|
} else if (!strcasecmp(argv[0],"rename-command") && argc == 4) {
|
|
/* rename-command <name> <command> <renamed-command> */
|
|
ri = sentinelGetMasterByName(argv[1]);
|
|
if (!ri) return "No such master with specified name.";
|
|
sds oldcmd = sdsnew(argv[2]);
|
|
sds newcmd = sdsnew(argv[3]);
|
|
if (dictAdd(ri->renamed_commands,oldcmd,newcmd) != DICT_OK) {
|
|
sdsfree(oldcmd);
|
|
sdsfree(newcmd);
|
|
return "Same command renamed multiple times with rename-command.";
|
|
}
|
|
} else if (!strcasecmp(argv[0],"announce-ip") && argc == 2) {
|
|
/* announce-ip <ip-address> */
|
|
if (strlen(argv[1]))
|
|
sentinel.announce_ip = sdsnew(argv[1]);
|
|
} else if (!strcasecmp(argv[0],"announce-port") && argc == 2) {
|
|
/* announce-port <port> */
|
|
sentinel.announce_port = atoi(argv[1]);
|
|
} else if (!strcasecmp(argv[0],"deny-scripts-reconfig") && argc == 2) {
|
|
/* deny-scripts-reconfig <yes|no> */
|
|
if ((sentinel.deny_scripts_reconfig = yesnotoi(argv[1])) == -1) {
|
|
return "Please specify yes or no for the "
|
|
"deny-scripts-reconfig options.";
|
|
}
|
|
} else if (!strcasecmp(argv[0],"sentinel-user") && argc == 2) {
|
|
/* sentinel-user <user-name> */
|
|
if (strlen(argv[1]))
|
|
sentinel.sentinel_auth_user = sdsnew(argv[1]);
|
|
} else if (!strcasecmp(argv[0],"sentinel-pass") && argc == 2) {
|
|
/* sentinel-pass <password> */
|
|
if (strlen(argv[1]))
|
|
sentinel.sentinel_auth_pass = sdsnew(argv[1]);
|
|
} else if (!strcasecmp(argv[0],"resolve-hostnames") && argc == 2) {
|
|
/* resolve-hostnames <yes|no> */
|
|
if ((sentinel.resolve_hostnames = yesnotoi(argv[1])) == -1) {
|
|
return "Please specify yes or no for the resolve-hostnames option.";
|
|
}
|
|
} else if (!strcasecmp(argv[0],"announce-hostnames") && argc == 2) {
|
|
/* announce-hostnames <yes|no> */
|
|
if ((sentinel.announce_hostnames = yesnotoi(argv[1])) == -1) {
|
|
return "Please specify yes or no for the announce-hostnames option.";
|
|
}
|
|
} else if (!strcasecmp(argv[0],"master-reboot-down-after-period") && argc == 3) {
|
|
/* master-reboot-down-after-period <name> <milliseconds> */
|
|
ri = sentinelGetMasterByName(argv[1]);
|
|
if (!ri) return "No such master with specified name.";
|
|
ri->master_reboot_down_after_period = atoi(argv[2]);
|
|
if (ri->master_reboot_down_after_period < 0)
|
|
return "negative time parameter.";
|
|
} else {
|
|
return "Unrecognized sentinel configuration statement.";
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* Implements CONFIG REWRITE for "sentinel" option.
|
|
* This is used not just to rewrite the configuration given by the user
|
|
* (the configured masters) but also in order to retain the state of
|
|
* Sentinel across restarts: config epoch of masters, associated slaves
|
|
* and sentinel instances, and so forth. */
|
|
void rewriteConfigSentinelOption(struct rewriteConfigState *state) {
|
|
dictIterator *di, *di2;
|
|
dictEntry *de;
|
|
sds line;
|
|
|
|
/* sentinel unique ID. */
|
|
line = sdscatprintf(sdsempty(), "sentinel myid %s", sentinel.myid);
|
|
rewriteConfigRewriteLine(state,"sentinel myid",line,1);
|
|
|
|
/* sentinel deny-scripts-reconfig. */
|
|
line = sdscatprintf(sdsempty(), "sentinel deny-scripts-reconfig %s",
|
|
sentinel.deny_scripts_reconfig ? "yes" : "no");
|
|
rewriteConfigRewriteLine(state,"sentinel deny-scripts-reconfig",line,
|
|
sentinel.deny_scripts_reconfig != SENTINEL_DEFAULT_DENY_SCRIPTS_RECONFIG);
|
|
|
|
/* sentinel resolve-hostnames.
|
|
* This must be included early in the file so it is already in effect
|
|
* when reading the file.
|
|
*/
|
|
line = sdscatprintf(sdsempty(), "sentinel resolve-hostnames %s",
|
|
sentinel.resolve_hostnames ? "yes" : "no");
|
|
rewriteConfigRewriteLine(state,"sentinel resolve-hostnames",line,
|
|
sentinel.resolve_hostnames != SENTINEL_DEFAULT_RESOLVE_HOSTNAMES);
|
|
|
|
/* sentinel announce-hostnames. */
|
|
line = sdscatprintf(sdsempty(), "sentinel announce-hostnames %s",
|
|
sentinel.announce_hostnames ? "yes" : "no");
|
|
rewriteConfigRewriteLine(state,"sentinel announce-hostnames",line,
|
|
sentinel.announce_hostnames != SENTINEL_DEFAULT_ANNOUNCE_HOSTNAMES);
|
|
|
|
/* For every master emit a "sentinel monitor" config entry. */
|
|
di = dictGetIterator(sentinel.masters);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *master, *ri;
|
|
sentinelAddr *master_addr;
|
|
|
|
/* sentinel monitor */
|
|
master = dictGetVal(de);
|
|
master_addr = sentinelGetCurrentMasterAddress(master);
|
|
line = sdscatprintf(sdsempty(),"sentinel monitor %s %s %d %d",
|
|
master->name, announceSentinelAddr(master_addr), master_addr->port,
|
|
master->quorum);
|
|
rewriteConfigRewriteLine(state,"sentinel monitor",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
|
|
/* sentinel down-after-milliseconds */
|
|
if (master->down_after_period != sentinel_default_down_after) {
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel down-after-milliseconds %s %ld",
|
|
master->name, (long) master->down_after_period);
|
|
rewriteConfigRewriteLine(state,"sentinel down-after-milliseconds",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
}
|
|
|
|
/* sentinel failover-timeout */
|
|
if (master->failover_timeout != sentinel_default_failover_timeout) {
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel failover-timeout %s %ld",
|
|
master->name, (long) master->failover_timeout);
|
|
rewriteConfigRewriteLine(state,"sentinel failover-timeout",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
|
|
}
|
|
|
|
/* sentinel parallel-syncs */
|
|
if (master->parallel_syncs != SENTINEL_DEFAULT_PARALLEL_SYNCS) {
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel parallel-syncs %s %d",
|
|
master->name, master->parallel_syncs);
|
|
rewriteConfigRewriteLine(state,"sentinel parallel-syncs",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
}
|
|
|
|
/* sentinel notification-script */
|
|
if (master->notification_script) {
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel notification-script %s %s",
|
|
master->name, master->notification_script);
|
|
rewriteConfigRewriteLine(state,"sentinel notification-script",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
}
|
|
|
|
/* sentinel client-reconfig-script */
|
|
if (master->client_reconfig_script) {
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel client-reconfig-script %s %s",
|
|
master->name, master->client_reconfig_script);
|
|
rewriteConfigRewriteLine(state,"sentinel client-reconfig-script",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
}
|
|
|
|
/* sentinel auth-pass & auth-user */
|
|
if (master->auth_pass) {
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel auth-pass %s %s",
|
|
master->name, master->auth_pass);
|
|
rewriteConfigRewriteLine(state,"sentinel auth-pass",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
}
|
|
|
|
if (master->auth_user) {
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel auth-user %s %s",
|
|
master->name, master->auth_user);
|
|
rewriteConfigRewriteLine(state,"sentinel auth-user",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
}
|
|
|
|
/* sentinel master-reboot-down-after-period */
|
|
if (master->master_reboot_down_after_period != 0) {
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel master-reboot-down-after-period %s %ld",
|
|
master->name, (long) master->master_reboot_down_after_period);
|
|
rewriteConfigRewriteLine(state,"sentinel master-reboot-down-after-period",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
}
|
|
|
|
/* sentinel config-epoch */
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel config-epoch %s %llu",
|
|
master->name, (unsigned long long) master->config_epoch);
|
|
rewriteConfigRewriteLine(state,"sentinel config-epoch",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
|
|
|
|
/* sentinel leader-epoch */
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel leader-epoch %s %llu",
|
|
master->name, (unsigned long long) master->leader_epoch);
|
|
rewriteConfigRewriteLine(state,"sentinel leader-epoch",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
|
|
/* sentinel known-slave */
|
|
di2 = dictGetIterator(master->slaves);
|
|
while((de = dictNext(di2)) != NULL) {
|
|
sentinelAddr *slave_addr;
|
|
|
|
ri = dictGetVal(de);
|
|
slave_addr = ri->addr;
|
|
|
|
/* If master_addr (obtained using sentinelGetCurrentMasterAddress()
|
|
* so it may be the address of the promoted slave) is equal to this
|
|
* slave's address, a failover is in progress and the slave was
|
|
* already successfully promoted. So as the address of this slave
|
|
* we use the old master address instead. */
|
|
if (sentinelAddrIsEqual(slave_addr,master_addr))
|
|
slave_addr = master->addr;
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel known-replica %s %s %d",
|
|
master->name, announceSentinelAddr(slave_addr), slave_addr->port);
|
|
rewriteConfigRewriteLine(state,"sentinel known-replica",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
}
|
|
dictReleaseIterator(di2);
|
|
|
|
/* sentinel known-sentinel */
|
|
di2 = dictGetIterator(master->sentinels);
|
|
while((de = dictNext(di2)) != NULL) {
|
|
ri = dictGetVal(de);
|
|
if (ri->runid == NULL) continue;
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel known-sentinel %s %s %d %s",
|
|
master->name, announceSentinelAddr(ri->addr), ri->addr->port, ri->runid);
|
|
rewriteConfigRewriteLine(state,"sentinel known-sentinel",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
}
|
|
dictReleaseIterator(di2);
|
|
|
|
/* sentinel rename-command */
|
|
di2 = dictGetIterator(master->renamed_commands);
|
|
while((de = dictNext(di2)) != NULL) {
|
|
sds oldname = dictGetKey(de);
|
|
sds newname = dictGetVal(de);
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel rename-command %s %s %s",
|
|
master->name, oldname, newname);
|
|
rewriteConfigRewriteLine(state,"sentinel rename-command",line,1);
|
|
/* rewriteConfigMarkAsProcessed is handled after the loop */
|
|
}
|
|
dictReleaseIterator(di2);
|
|
}
|
|
|
|
/* sentinel current-epoch is a global state valid for all the masters. */
|
|
line = sdscatprintf(sdsempty(),
|
|
"sentinel current-epoch %llu", (unsigned long long) sentinel.current_epoch);
|
|
rewriteConfigRewriteLine(state,"sentinel current-epoch",line,1);
|
|
|
|
/* sentinel announce-ip. */
|
|
if (sentinel.announce_ip) {
|
|
line = sdsnew("sentinel announce-ip ");
|
|
line = sdscatrepr(line, sentinel.announce_ip, sdslen(sentinel.announce_ip));
|
|
rewriteConfigRewriteLine(state,"sentinel announce-ip",line,1);
|
|
} else {
|
|
rewriteConfigMarkAsProcessed(state,"sentinel announce-ip");
|
|
}
|
|
|
|
/* sentinel announce-port. */
|
|
if (sentinel.announce_port) {
|
|
line = sdscatprintf(sdsempty(),"sentinel announce-port %d",
|
|
sentinel.announce_port);
|
|
rewriteConfigRewriteLine(state,"sentinel announce-port",line,1);
|
|
} else {
|
|
rewriteConfigMarkAsProcessed(state,"sentinel announce-port");
|
|
}
|
|
|
|
/* sentinel sentinel-user. */
|
|
if (sentinel.sentinel_auth_user) {
|
|
line = sdscatprintf(sdsempty(), "sentinel sentinel-user %s", sentinel.sentinel_auth_user);
|
|
rewriteConfigRewriteLine(state,"sentinel sentinel-user",line,1);
|
|
} else {
|
|
rewriteConfigMarkAsProcessed(state,"sentinel sentinel-user");
|
|
}
|
|
|
|
/* sentinel sentinel-pass. */
|
|
if (sentinel.sentinel_auth_pass) {
|
|
line = sdscatprintf(sdsempty(), "sentinel sentinel-pass %s", sentinel.sentinel_auth_pass);
|
|
rewriteConfigRewriteLine(state,"sentinel sentinel-pass",line,1);
|
|
} else {
|
|
rewriteConfigMarkAsProcessed(state,"sentinel sentinel-pass");
|
|
}
|
|
|
|
dictReleaseIterator(di);
|
|
|
|
/* NOTE: the purpose here is in case due to the state change, the config rewrite
|
|
does not handle the configs, however, previously the config was set in the config file,
|
|
rewriteConfigMarkAsProcessed should be put here to mark it as processed in order to
|
|
delete the old config entry.
|
|
*/
|
|
rewriteConfigMarkAsProcessed(state,"sentinel monitor");
|
|
rewriteConfigMarkAsProcessed(state,"sentinel down-after-milliseconds");
|
|
rewriteConfigMarkAsProcessed(state,"sentinel failover-timeout");
|
|
rewriteConfigMarkAsProcessed(state,"sentinel parallel-syncs");
|
|
rewriteConfigMarkAsProcessed(state,"sentinel notification-script");
|
|
rewriteConfigMarkAsProcessed(state,"sentinel client-reconfig-script");
|
|
rewriteConfigMarkAsProcessed(state,"sentinel auth-pass");
|
|
rewriteConfigMarkAsProcessed(state,"sentinel auth-user");
|
|
rewriteConfigMarkAsProcessed(state,"sentinel config-epoch");
|
|
rewriteConfigMarkAsProcessed(state,"sentinel leader-epoch");
|
|
rewriteConfigMarkAsProcessed(state,"sentinel known-replica");
|
|
rewriteConfigMarkAsProcessed(state,"sentinel known-sentinel");
|
|
rewriteConfigMarkAsProcessed(state,"sentinel rename-command");
|
|
rewriteConfigMarkAsProcessed(state,"sentinel master-reboot-down-after-period");
|
|
}
|
|
|
|
/* This function uses the config rewriting Redis engine in order to persist
|
|
* the state of the Sentinel in the current configuration file.
|
|
*
|
|
* Before returning the function calls fsync() against the generated
|
|
* configuration file to make sure changes are committed to disk.
|
|
*
|
|
* On failure the function logs a warning on the Redis log. */
|
|
int sentinelFlushConfig(void) {
|
|
int fd = -1;
|
|
int saved_hz = server.hz;
|
|
int rewrite_status;
|
|
|
|
server.hz = CONFIG_DEFAULT_HZ;
|
|
rewrite_status = rewriteConfig(server.configfile, 0);
|
|
server.hz = saved_hz;
|
|
|
|
if (rewrite_status == -1) goto werr;
|
|
if ((fd = open(server.configfile,O_RDONLY)) == -1) goto werr;
|
|
if (fsync(fd) == -1) goto werr;
|
|
if (close(fd) == EOF) goto werr;
|
|
serverLog(LL_NOTICE,"Sentinel new configuration saved on disk");
|
|
return C_OK;
|
|
|
|
werr:
|
|
serverLog(LL_WARNING,"WARNING: Sentinel was not able to save the new configuration on disk!!!: %s", strerror(errno));
|
|
if (fd != -1) close(fd);
|
|
return C_ERR;
|
|
}
|
|
|
|
/* Call sentinelFlushConfig() produce a success/error reply to the
|
|
* calling client.
|
|
*/
|
|
static void sentinelFlushConfigAndReply(client *c) {
|
|
if (sentinelFlushConfig() == C_ERR)
|
|
addReplyError(c, "Failed to save config file. Check server logs.");
|
|
else
|
|
addReply(c, shared.ok);
|
|
}
|
|
|
|
/* ====================== hiredis connection handling ======================= */
|
|
|
|
/* Send the AUTH command with the specified master password if needed.
|
|
* Note that for slaves the password set for the master is used.
|
|
*
|
|
* In case this Sentinel requires a password as well, via the "requirepass"
|
|
* configuration directive, we assume we should use the local password in
|
|
* order to authenticate when connecting with the other Sentinels as well.
|
|
* So basically all the Sentinels share the same password and use it to
|
|
* authenticate reciprocally.
|
|
*
|
|
* We don't check at all if the command was successfully transmitted
|
|
* to the instance as if it fails Sentinel will detect the instance down,
|
|
* will disconnect and reconnect the link and so forth. */
|
|
void sentinelSendAuthIfNeeded(sentinelRedisInstance *ri, redisAsyncContext *c) {
|
|
char *auth_pass = NULL;
|
|
char *auth_user = NULL;
|
|
|
|
if (ri->flags & SRI_MASTER) {
|
|
auth_pass = ri->auth_pass;
|
|
auth_user = ri->auth_user;
|
|
} else if (ri->flags & SRI_SLAVE) {
|
|
auth_pass = ri->master->auth_pass;
|
|
auth_user = ri->master->auth_user;
|
|
} else if (ri->flags & SRI_SENTINEL) {
|
|
/* If sentinel_auth_user is NULL, AUTH will use default user
|
|
with sentinel_auth_pass to authenticate */
|
|
if (sentinel.sentinel_auth_pass) {
|
|
auth_pass = sentinel.sentinel_auth_pass;
|
|
auth_user = sentinel.sentinel_auth_user;
|
|
} else {
|
|
/* Compatibility with old configs. requirepass is used
|
|
* for both incoming and outgoing authentication. */
|
|
auth_pass = server.requirepass;
|
|
auth_user = NULL;
|
|
}
|
|
}
|
|
|
|
if (auth_pass && auth_user == NULL) {
|
|
if (redisAsyncCommand(c, sentinelDiscardReplyCallback, ri, "%s %s",
|
|
sentinelInstanceMapCommand(ri,"AUTH"),
|
|
auth_pass) == C_OK) ri->link->pending_commands++;
|
|
} else if (auth_pass && auth_user) {
|
|
/* If we also have an username, use the ACL-style AUTH command
|
|
* with two arguments, username and password. */
|
|
if (redisAsyncCommand(c, sentinelDiscardReplyCallback, ri, "%s %s %s",
|
|
sentinelInstanceMapCommand(ri,"AUTH"),
|
|
auth_user, auth_pass) == C_OK) ri->link->pending_commands++;
|
|
}
|
|
}
|
|
|
|
/* Use CLIENT SETNAME to name the connection in the Redis instance as
|
|
* sentinel-<first_8_chars_of_runid>-<connection_type>
|
|
* The connection type is "cmd" or "pubsub" as specified by 'type'.
|
|
*
|
|
* This makes it possible to list all the sentinel instances connected
|
|
* to a Redis server with CLIENT LIST, grepping for a specific name format. */
|
|
void sentinelSetClientName(sentinelRedisInstance *ri, redisAsyncContext *c, char *type) {
|
|
char name[64];
|
|
|
|
snprintf(name,sizeof(name),"sentinel-%.8s-%s",sentinel.myid,type);
|
|
if (redisAsyncCommand(c, sentinelDiscardReplyCallback, ri,
|
|
"%s SETNAME %s",
|
|
sentinelInstanceMapCommand(ri,"CLIENT"),
|
|
name) == C_OK)
|
|
{
|
|
ri->link->pending_commands++;
|
|
}
|
|
}
|
|
|
|
static int instanceLinkNegotiateTLS(redisAsyncContext *context) {
|
|
#ifndef USE_OPENSSL
|
|
(void) context;
|
|
#else
|
|
if (!redis_tls_ctx) return C_ERR;
|
|
SSL *ssl = SSL_new(redis_tls_client_ctx ? redis_tls_client_ctx : redis_tls_ctx);
|
|
if (!ssl) return C_ERR;
|
|
|
|
if (redisInitiateSSL(&context->c, ssl) == REDIS_ERR) {
|
|
SSL_free(ssl);
|
|
return C_ERR;
|
|
}
|
|
#endif
|
|
return C_OK;
|
|
}
|
|
|
|
/* Create the async connections for the instance link if the link
|
|
* is disconnected. Note that link->disconnected is true even if just
|
|
* one of the two links (commands and pub/sub) is missing. */
|
|
void sentinelReconnectInstance(sentinelRedisInstance *ri) {
|
|
|
|
if (ri->link->disconnected == 0) return;
|
|
if (ri->addr->port == 0) return; /* port == 0 means invalid address. */
|
|
instanceLink *link = ri->link;
|
|
mstime_t now = mstime();
|
|
|
|
if (now - ri->link->last_reconn_time < sentinel_ping_period) return;
|
|
ri->link->last_reconn_time = now;
|
|
|
|
/* Commands connection. */
|
|
if (link->cc == NULL) {
|
|
|
|
/* It might be that the instance is disconnected because it wasn't available earlier when the instance
|
|
* allocated, say during failover, and therefore we failed to resolve its ip.
|
|
* Another scenario is that the instance restarted with new ip, and we should resolve its new ip based on
|
|
* its hostname */
|
|
if (sentinel.resolve_hostnames) {
|
|
sentinelAddr *tryResolveAddr = createSentinelAddr(ri->addr->hostname, ri->addr->port, 0);
|
|
if (tryResolveAddr != NULL) {
|
|
releaseSentinelAddr(ri->addr);
|
|
ri->addr = tryResolveAddr;
|
|
}
|
|
}
|
|
|
|
link->cc = redisAsyncConnectBind(ri->addr->ip,ri->addr->port,server.bind_source_addr);
|
|
|
|
if (link->cc && !link->cc->err) anetCloexec(link->cc->c.fd);
|
|
if (!link->cc) {
|
|
sentinelEvent(LL_DEBUG,"-cmd-link-reconnection",ri,"%@ #Failed to establish connection");
|
|
} else if (!link->cc->err && server.tls_replication &&
|
|
(instanceLinkNegotiateTLS(link->cc) == C_ERR)) {
|
|
sentinelEvent(LL_DEBUG,"-cmd-link-reconnection",ri,"%@ #Failed to initialize TLS");
|
|
instanceLinkCloseConnection(link,link->cc);
|
|
} else if (link->cc->err) {
|
|
sentinelEvent(LL_DEBUG,"-cmd-link-reconnection",ri,"%@ #%s",
|
|
link->cc->errstr);
|
|
instanceLinkCloseConnection(link,link->cc);
|
|
} else {
|
|
link->pending_commands = 0;
|
|
link->cc_conn_time = mstime();
|
|
link->cc->data = link;
|
|
redisAeAttach(server.el,link->cc);
|
|
redisAsyncSetConnectCallback(link->cc,
|
|
sentinelLinkEstablishedCallback);
|
|
redisAsyncSetDisconnectCallback(link->cc,
|
|
sentinelDisconnectCallback);
|
|
sentinelSendAuthIfNeeded(ri,link->cc);
|
|
sentinelSetClientName(ri,link->cc,"cmd");
|
|
|
|
/* Send a PING ASAP when reconnecting. */
|
|
sentinelSendPing(ri);
|
|
}
|
|
}
|
|
/* Pub / Sub */
|
|
if ((ri->flags & (SRI_MASTER|SRI_SLAVE)) && link->pc == NULL) {
|
|
link->pc = redisAsyncConnectBind(ri->addr->ip,ri->addr->port,server.bind_source_addr);
|
|
if (link->pc && !link->pc->err) anetCloexec(link->pc->c.fd);
|
|
if (!link->pc) {
|
|
sentinelEvent(LL_DEBUG,"-pubsub-link-reconnection",ri,"%@ #Failed to establish connection");
|
|
} else if (!link->pc->err && server.tls_replication &&
|
|
(instanceLinkNegotiateTLS(link->pc) == C_ERR)) {
|
|
sentinelEvent(LL_DEBUG,"-pubsub-link-reconnection",ri,"%@ #Failed to initialize TLS");
|
|
} else if (link->pc->err) {
|
|
sentinelEvent(LL_DEBUG,"-pubsub-link-reconnection",ri,"%@ #%s",
|
|
link->pc->errstr);
|
|
instanceLinkCloseConnection(link,link->pc);
|
|
} else {
|
|
int retval;
|
|
link->pc_conn_time = mstime();
|
|
link->pc->data = link;
|
|
redisAeAttach(server.el,link->pc);
|
|
redisAsyncSetConnectCallback(link->pc,
|
|
sentinelLinkEstablishedCallback);
|
|
redisAsyncSetDisconnectCallback(link->pc,
|
|
sentinelDisconnectCallback);
|
|
sentinelSendAuthIfNeeded(ri,link->pc);
|
|
sentinelSetClientName(ri,link->pc,"pubsub");
|
|
/* Now we subscribe to the Sentinels "Hello" channel. */
|
|
retval = redisAsyncCommand(link->pc,
|
|
sentinelReceiveHelloMessages, ri, "%s %s",
|
|
sentinelInstanceMapCommand(ri,"SUBSCRIBE"),
|
|
SENTINEL_HELLO_CHANNEL);
|
|
if (retval != C_OK) {
|
|
/* If we can't subscribe, the Pub/Sub connection is useless
|
|
* and we can simply disconnect it and try again. */
|
|
instanceLinkCloseConnection(link,link->pc);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
/* Clear the disconnected status only if we have both the connections
|
|
* (or just the commands connection if this is a sentinel instance). */
|
|
if (link->cc && (ri->flags & SRI_SENTINEL || link->pc))
|
|
link->disconnected = 0;
|
|
}
|
|
|
|
/* ======================== Redis instances pinging ======================== */
|
|
|
|
/* Return true if master looks "sane", that is:
|
|
* 1) It is actually a master in the current configuration.
|
|
* 2) It reports itself as a master.
|
|
* 3) It is not SDOWN or ODOWN.
|
|
* 4) We obtained last INFO no more than two times the INFO period time ago. */
|
|
int sentinelMasterLooksSane(sentinelRedisInstance *master) {
|
|
return
|
|
master->flags & SRI_MASTER &&
|
|
master->role_reported == SRI_MASTER &&
|
|
(master->flags & (SRI_S_DOWN|SRI_O_DOWN)) == 0 &&
|
|
(mstime() - master->info_refresh) < sentinel_info_period*2;
|
|
}
|
|
|
|
/* Process the INFO output from masters. */
|
|
void sentinelRefreshInstanceInfo(sentinelRedisInstance *ri, const char *info) {
|
|
sds *lines;
|
|
int numlines, j;
|
|
int role = 0;
|
|
|
|
/* cache full INFO output for instance */
|
|
sdsfree(ri->info);
|
|
ri->info = sdsnew(info);
|
|
|
|
/* The following fields must be reset to a given value in the case they
|
|
* are not found at all in the INFO output. */
|
|
ri->master_link_down_time = 0;
|
|
|
|
/* Process line by line. */
|
|
lines = sdssplitlen(info,strlen(info),"\r\n",2,&numlines);
|
|
for (j = 0; j < numlines; j++) {
|
|
sentinelRedisInstance *slave;
|
|
sds l = lines[j];
|
|
|
|
/* run_id:<40 hex chars>*/
|
|
if (sdslen(l) >= 47 && !memcmp(l,"run_id:",7)) {
|
|
if (ri->runid == NULL) {
|
|
ri->runid = sdsnewlen(l+7,40);
|
|
} else {
|
|
if (strncmp(ri->runid,l+7,40) != 0) {
|
|
sentinelEvent(LL_NOTICE,"+reboot",ri,"%@");
|
|
|
|
if (ri->flags & SRI_MASTER && ri->master_reboot_down_after_period != 0) {
|
|
ri->flags |= SRI_MASTER_REBOOT;
|
|
ri->master_reboot_since_time = mstime();
|
|
}
|
|
|
|
sdsfree(ri->runid);
|
|
ri->runid = sdsnewlen(l+7,40);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* old versions: slave0:<ip>,<port>,<state>
|
|
* new versions: slave0:ip=127.0.0.1,port=9999,... */
|
|
if ((ri->flags & SRI_MASTER) &&
|
|
sdslen(l) >= 7 &&
|
|
!memcmp(l,"slave",5) && isdigit(l[5]))
|
|
{
|
|
char *ip, *port, *end;
|
|
|
|
if (strstr(l,"ip=") == NULL) {
|
|
/* Old format. */
|
|
ip = strchr(l,':'); if (!ip) continue;
|
|
ip++; /* Now ip points to start of ip address. */
|
|
port = strchr(ip,','); if (!port) continue;
|
|
*port = '\0'; /* nul term for easy access. */
|
|
port++; /* Now port points to start of port number. */
|
|
end = strchr(port,','); if (!end) continue;
|
|
*end = '\0'; /* nul term for easy access. */
|
|
} else {
|
|
/* New format. */
|
|
ip = strstr(l,"ip="); if (!ip) continue;
|
|
ip += 3; /* Now ip points to start of ip address. */
|
|
port = strstr(l,"port="); if (!port) continue;
|
|
port += 5; /* Now port points to start of port number. */
|
|
/* Nul term both fields for easy access. */
|
|
end = strchr(ip,','); if (end) *end = '\0';
|
|
end = strchr(port,','); if (end) *end = '\0';
|
|
}
|
|
|
|
/* Check if we already have this slave into our table,
|
|
* otherwise add it. */
|
|
if (sentinelRedisInstanceLookupSlave(ri,ip,atoi(port)) == NULL) {
|
|
if ((slave = createSentinelRedisInstance(NULL,SRI_SLAVE,ip,
|
|
atoi(port), ri->quorum, ri)) != NULL)
|
|
{
|
|
sentinelEvent(LL_NOTICE,"+slave",slave,"%@");
|
|
sentinelFlushConfig();
|
|
}
|
|
}
|
|
}
|
|
|
|
/* master_link_down_since_seconds:<seconds> */
|
|
if (sdslen(l) >= 32 &&
|
|
!memcmp(l,"master_link_down_since_seconds",30))
|
|
{
|
|
ri->master_link_down_time = strtoll(l+31,NULL,10)*1000;
|
|
}
|
|
|
|
/* role:<role> */
|
|
if (sdslen(l) >= 11 && !memcmp(l,"role:master",11)) role = SRI_MASTER;
|
|
else if (sdslen(l) >= 10 && !memcmp(l,"role:slave",10)) role = SRI_SLAVE;
|
|
|
|
if (role == SRI_SLAVE) {
|
|
/* master_host:<host> */
|
|
if (sdslen(l) >= 12 && !memcmp(l,"master_host:",12)) {
|
|
if (ri->slave_master_host == NULL ||
|
|
strcasecmp(l+12,ri->slave_master_host))
|
|
{
|
|
sdsfree(ri->slave_master_host);
|
|
ri->slave_master_host = sdsnew(l+12);
|
|
ri->slave_conf_change_time = mstime();
|
|
}
|
|
}
|
|
|
|
/* master_port:<port> */
|
|
if (sdslen(l) >= 12 && !memcmp(l,"master_port:",12)) {
|
|
int slave_master_port = atoi(l+12);
|
|
|
|
if (ri->slave_master_port != slave_master_port) {
|
|
ri->slave_master_port = slave_master_port;
|
|
ri->slave_conf_change_time = mstime();
|
|
}
|
|
}
|
|
|
|
/* master_link_status:<status> */
|
|
if (sdslen(l) >= 19 && !memcmp(l,"master_link_status:",19)) {
|
|
ri->slave_master_link_status =
|
|
(strcasecmp(l+19,"up") == 0) ?
|
|
SENTINEL_MASTER_LINK_STATUS_UP :
|
|
SENTINEL_MASTER_LINK_STATUS_DOWN;
|
|
}
|
|
|
|
/* slave_priority:<priority> */
|
|
if (sdslen(l) >= 15 && !memcmp(l,"slave_priority:",15))
|
|
ri->slave_priority = atoi(l+15);
|
|
|
|
/* slave_repl_offset:<offset> */
|
|
if (sdslen(l) >= 18 && !memcmp(l,"slave_repl_offset:",18))
|
|
ri->slave_repl_offset = strtoull(l+18,NULL,10);
|
|
|
|
/* replica_announced:<announcement> */
|
|
if (sdslen(l) >= 18 && !memcmp(l,"replica_announced:",18))
|
|
ri->replica_announced = atoi(l+18);
|
|
}
|
|
}
|
|
ri->info_refresh = mstime();
|
|
sdsfreesplitres(lines,numlines);
|
|
|
|
/* ---------------------------- Acting half -----------------------------
|
|
* Some things will not happen if sentinel.tilt is true, but some will
|
|
* still be processed. */
|
|
|
|
/* Remember when the role changed. */
|
|
if (role != ri->role_reported) {
|
|
ri->role_reported_time = mstime();
|
|
ri->role_reported = role;
|
|
if (role == SRI_SLAVE) ri->slave_conf_change_time = mstime();
|
|
/* Log the event with +role-change if the new role is coherent or
|
|
* with -role-change if there is a mismatch with the current config. */
|
|
sentinelEvent(LL_VERBOSE,
|
|
((ri->flags & (SRI_MASTER|SRI_SLAVE)) == role) ?
|
|
"+role-change" : "-role-change",
|
|
ri, "%@ new reported role is %s",
|
|
role == SRI_MASTER ? "master" : "slave");
|
|
}
|
|
|
|
/* None of the following conditions are processed when in tilt mode, so
|
|
* return asap. */
|
|
if (sentinel.tilt) return;
|
|
|
|
/* Handle master -> slave role switch. */
|
|
if ((ri->flags & SRI_MASTER) && role == SRI_SLAVE) {
|
|
/* Nothing to do, but masters claiming to be slaves are
|
|
* considered to be unreachable by Sentinel, so eventually
|
|
* a failover will be triggered. */
|
|
}
|
|
|
|
/* Handle slave -> master role switch. */
|
|
if ((ri->flags & SRI_SLAVE) && role == SRI_MASTER) {
|
|
/* If this is a promoted slave we can change state to the
|
|
* failover state machine. */
|
|
if ((ri->flags & SRI_PROMOTED) &&
|
|
(ri->master->flags & SRI_FAILOVER_IN_PROGRESS) &&
|
|
(ri->master->failover_state ==
|
|
SENTINEL_FAILOVER_STATE_WAIT_PROMOTION))
|
|
{
|
|
/* Now that we are sure the slave was reconfigured as a master
|
|
* set the master configuration epoch to the epoch we won the
|
|
* election to perform this failover. This will force the other
|
|
* Sentinels to update their config (assuming there is not
|
|
* a newer one already available). */
|
|
ri->master->config_epoch = ri->master->failover_epoch;
|
|
ri->master->failover_state = SENTINEL_FAILOVER_STATE_RECONF_SLAVES;
|
|
ri->master->failover_state_change_time = mstime();
|
|
sentinelFlushConfig();
|
|
sentinelEvent(LL_WARNING,"+promoted-slave",ri,"%@");
|
|
if (sentinel.simfailure_flags &
|
|
SENTINEL_SIMFAILURE_CRASH_AFTER_PROMOTION)
|
|
sentinelSimFailureCrash();
|
|
sentinelEvent(LL_WARNING,"+failover-state-reconf-slaves",
|
|
ri->master,"%@");
|
|
sentinelCallClientReconfScript(ri->master,SENTINEL_LEADER,
|
|
"start",ri->master->addr,ri->addr);
|
|
sentinelForceHelloUpdateForMaster(ri->master);
|
|
} else {
|
|
/* A slave turned into a master. We want to force our view and
|
|
* reconfigure as slave. Wait some time after the change before
|
|
* going forward, to receive new configs if any. */
|
|
mstime_t wait_time = sentinel_publish_period*4;
|
|
|
|
if (!(ri->flags & SRI_PROMOTED) &&
|
|
sentinelMasterLooksSane(ri->master) &&
|
|
sentinelRedisInstanceNoDownFor(ri,wait_time) &&
|
|
mstime() - ri->role_reported_time > wait_time)
|
|
{
|
|
int retval = sentinelSendSlaveOf(ri,ri->master->addr);
|
|
if (retval == C_OK)
|
|
sentinelEvent(LL_NOTICE,"+convert-to-slave",ri,"%@");
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Handle slaves replicating to a different master address. */
|
|
if ((ri->flags & SRI_SLAVE) &&
|
|
role == SRI_SLAVE &&
|
|
(ri->slave_master_port != ri->master->addr->port ||
|
|
!sentinelAddrEqualsHostname(ri->master->addr, ri->slave_master_host)))
|
|
{
|
|
mstime_t wait_time = ri->master->failover_timeout;
|
|
|
|
/* Make sure the master is sane before reconfiguring this instance
|
|
* into a slave. */
|
|
if (sentinelMasterLooksSane(ri->master) &&
|
|
sentinelRedisInstanceNoDownFor(ri,wait_time) &&
|
|
mstime() - ri->slave_conf_change_time > wait_time)
|
|
{
|
|
int retval = sentinelSendSlaveOf(ri,ri->master->addr);
|
|
if (retval == C_OK)
|
|
sentinelEvent(LL_NOTICE,"+fix-slave-config",ri,"%@");
|
|
}
|
|
}
|
|
|
|
/* Detect if the slave that is in the process of being reconfigured
|
|
* changed state. */
|
|
if ((ri->flags & SRI_SLAVE) && role == SRI_SLAVE &&
|
|
(ri->flags & (SRI_RECONF_SENT|SRI_RECONF_INPROG)))
|
|
{
|
|
/* SRI_RECONF_SENT -> SRI_RECONF_INPROG. */
|
|
if ((ri->flags & SRI_RECONF_SENT) &&
|
|
ri->slave_master_host &&
|
|
sentinelAddrEqualsHostname(ri->master->promoted_slave->addr,
|
|
ri->slave_master_host) &&
|
|
ri->slave_master_port == ri->master->promoted_slave->addr->port)
|
|
{
|
|
ri->flags &= ~SRI_RECONF_SENT;
|
|
ri->flags |= SRI_RECONF_INPROG;
|
|
sentinelEvent(LL_NOTICE,"+slave-reconf-inprog",ri,"%@");
|
|
}
|
|
|
|
/* SRI_RECONF_INPROG -> SRI_RECONF_DONE */
|
|
if ((ri->flags & SRI_RECONF_INPROG) &&
|
|
ri->slave_master_link_status == SENTINEL_MASTER_LINK_STATUS_UP)
|
|
{
|
|
ri->flags &= ~SRI_RECONF_INPROG;
|
|
ri->flags |= SRI_RECONF_DONE;
|
|
sentinelEvent(LL_NOTICE,"+slave-reconf-done",ri,"%@");
|
|
}
|
|
}
|
|
}
|
|
|
|
void sentinelInfoReplyCallback(redisAsyncContext *c, void *reply, void *privdata) {
|
|
sentinelRedisInstance *ri = privdata;
|
|
instanceLink *link = c->data;
|
|
redisReply *r;
|
|
|
|
if (!reply || !link) return;
|
|
link->pending_commands--;
|
|
r = reply;
|
|
|
|
if (r->type == REDIS_REPLY_STRING)
|
|
sentinelRefreshInstanceInfo(ri,r->str);
|
|
}
|
|
|
|
/* Just discard the reply. We use this when we are not monitoring the return
|
|
* value of the command but its effects directly. */
|
|
void sentinelDiscardReplyCallback(redisAsyncContext *c, void *reply, void *privdata) {
|
|
instanceLink *link = c->data;
|
|
UNUSED(reply);
|
|
UNUSED(privdata);
|
|
|
|
if (link) link->pending_commands--;
|
|
}
|
|
|
|
void sentinelPingReplyCallback(redisAsyncContext *c, void *reply, void *privdata) {
|
|
sentinelRedisInstance *ri = privdata;
|
|
instanceLink *link = c->data;
|
|
redisReply *r;
|
|
|
|
if (!reply || !link) return;
|
|
link->pending_commands--;
|
|
r = reply;
|
|
|
|
if (r->type == REDIS_REPLY_STATUS ||
|
|
r->type == REDIS_REPLY_ERROR) {
|
|
/* Update the "instance available" field only if this is an
|
|
* acceptable reply. */
|
|
if (strncmp(r->str,"PONG",4) == 0 ||
|
|
strncmp(r->str,"LOADING",7) == 0 ||
|
|
strncmp(r->str,"MASTERDOWN",10) == 0)
|
|
{
|
|
link->last_avail_time = mstime();
|
|
link->act_ping_time = 0; /* Flag the pong as received. */
|
|
|
|
if (ri->flags & SRI_MASTER_REBOOT && strncmp(r->str,"PONG",4) == 0)
|
|
ri->flags &= ~SRI_MASTER_REBOOT;
|
|
|
|
} else {
|
|
/* Send a SCRIPT KILL command if the instance appears to be
|
|
* down because of a busy script. */
|
|
if (strncmp(r->str,"BUSY",4) == 0 &&
|
|
(ri->flags & SRI_S_DOWN) &&
|
|
!(ri->flags & SRI_SCRIPT_KILL_SENT))
|
|
{
|
|
if (redisAsyncCommand(ri->link->cc,
|
|
sentinelDiscardReplyCallback, ri,
|
|
"%s KILL",
|
|
sentinelInstanceMapCommand(ri,"SCRIPT")) == C_OK)
|
|
{
|
|
ri->link->pending_commands++;
|
|
}
|
|
ri->flags |= SRI_SCRIPT_KILL_SENT;
|
|
}
|
|
}
|
|
}
|
|
link->last_pong_time = mstime();
|
|
}
|
|
|
|
/* This is called when we get the reply about the PUBLISH command we send
|
|
* to the master to advertise this sentinel. */
|
|
void sentinelPublishReplyCallback(redisAsyncContext *c, void *reply, void *privdata) {
|
|
sentinelRedisInstance *ri = privdata;
|
|
instanceLink *link = c->data;
|
|
redisReply *r;
|
|
|
|
if (!reply || !link) return;
|
|
link->pending_commands--;
|
|
r = reply;
|
|
|
|
/* Only update pub_time if we actually published our message. Otherwise
|
|
* we'll retry again in 100 milliseconds. */
|
|
if (r->type != REDIS_REPLY_ERROR)
|
|
ri->last_pub_time = mstime();
|
|
}
|
|
|
|
/* Process a hello message received via Pub/Sub in master or slave instance,
|
|
* or sent directly to this sentinel via the (fake) PUBLISH command of Sentinel.
|
|
*
|
|
* If the master name specified in the message is not known, the message is
|
|
* discarded. */
|
|
void sentinelProcessHelloMessage(char *hello, int hello_len) {
|
|
/* Format is composed of 8 tokens:
|
|
* 0=ip,1=port,2=runid,3=current_epoch,4=master_name,
|
|
* 5=master_ip,6=master_port,7=master_config_epoch. */
|
|
int numtokens, port, removed, master_port;
|
|
uint64_t current_epoch, master_config_epoch;
|
|
char **token = sdssplitlen(hello, hello_len, ",", 1, &numtokens);
|
|
sentinelRedisInstance *si, *master;
|
|
|
|
if (numtokens == 8) {
|
|
/* Obtain a reference to the master this hello message is about */
|
|
master = sentinelGetMasterByName(token[4]);
|
|
if (!master) goto cleanup; /* Unknown master, skip the message. */
|
|
|
|
/* First, try to see if we already have this sentinel. */
|
|
port = atoi(token[1]);
|
|
master_port = atoi(token[6]);
|
|
si = getSentinelRedisInstanceByAddrAndRunID(
|
|
master->sentinels,token[0],port,token[2]);
|
|
current_epoch = strtoull(token[3],NULL,10);
|
|
master_config_epoch = strtoull(token[7],NULL,10);
|
|
|
|
if (!si) {
|
|
/* If not, remove all the sentinels that have the same runid
|
|
* because there was an address change, and add the same Sentinel
|
|
* with the new address back. */
|
|
removed = removeMatchingSentinelFromMaster(master,token[2]);
|
|
if (removed) {
|
|
sentinelEvent(LL_NOTICE,"+sentinel-address-switch",master,
|
|
"%@ ip %s port %d for %s", token[0],port,token[2]);
|
|
} else {
|
|
/* Check if there is another Sentinel with the same address this
|
|
* new one is reporting. What we do if this happens is to set its
|
|
* port to 0, to signal the address is invalid. We'll update it
|
|
* later if we get an HELLO message. */
|
|
sentinelRedisInstance *other =
|
|
getSentinelRedisInstanceByAddrAndRunID(
|
|
master->sentinels, token[0],port,NULL);
|
|
if (other) {
|
|
/* If there is already other sentinel with same address (but
|
|
* different runid) then remove the old one across all masters */
|
|
sentinelEvent(LL_NOTICE,"+sentinel-invalid-addr",other,"%@");
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
|
|
/* Keep a copy of runid. 'other' about to be deleted in loop. */
|
|
sds runid_obsolete = sdsnew(other->runid);
|
|
|
|
di = dictGetIterator(sentinel.masters);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *master = dictGetVal(de);
|
|
removeMatchingSentinelFromMaster(master, runid_obsolete);
|
|
}
|
|
dictReleaseIterator(di);
|
|
sdsfree(runid_obsolete);
|
|
}
|
|
}
|
|
|
|
/* Add the new sentinel. */
|
|
si = createSentinelRedisInstance(token[2],SRI_SENTINEL,
|
|
token[0],port,master->quorum,master);
|
|
|
|
if (si) {
|
|
if (!removed) sentinelEvent(LL_NOTICE,"+sentinel",si,"%@");
|
|
/* The runid is NULL after a new instance creation and
|
|
* for Sentinels we don't have a later chance to fill it,
|
|
* so do it now. */
|
|
si->runid = sdsnew(token[2]);
|
|
sentinelTryConnectionSharing(si);
|
|
if (removed) sentinelUpdateSentinelAddressInAllMasters(si);
|
|
sentinelFlushConfig();
|
|
}
|
|
}
|
|
|
|
/* Update local current_epoch if received current_epoch is greater.*/
|
|
if (current_epoch > sentinel.current_epoch) {
|
|
sentinel.current_epoch = current_epoch;
|
|
sentinelFlushConfig();
|
|
sentinelEvent(LL_WARNING,"+new-epoch",master,"%llu",
|
|
(unsigned long long) sentinel.current_epoch);
|
|
}
|
|
|
|
/* Update master info if received configuration is newer. */
|
|
if (si && master->config_epoch < master_config_epoch) {
|
|
master->config_epoch = master_config_epoch;
|
|
if (master_port != master->addr->port ||
|
|
!sentinelAddrEqualsHostname(master->addr, token[5]))
|
|
{
|
|
sentinelAddr *old_addr;
|
|
|
|
sentinelEvent(LL_WARNING,"+config-update-from",si,"%@");
|
|
sentinelEvent(LL_WARNING,"+switch-master",
|
|
master,"%s %s %d %s %d",
|
|
master->name,
|
|
announceSentinelAddr(master->addr), master->addr->port,
|
|
token[5], master_port);
|
|
|
|
old_addr = dupSentinelAddr(master->addr);
|
|
sentinelResetMasterAndChangeAddress(master, token[5], master_port);
|
|
sentinelCallClientReconfScript(master,
|
|
SENTINEL_OBSERVER,"start",
|
|
old_addr,master->addr);
|
|
releaseSentinelAddr(old_addr);
|
|
}
|
|
}
|
|
|
|
/* Update the state of the Sentinel. */
|
|
if (si) si->last_hello_time = mstime();
|
|
}
|
|
|
|
cleanup:
|
|
sdsfreesplitres(token,numtokens);
|
|
}
|
|
|
|
|
|
/* This is our Pub/Sub callback for the Hello channel. It's useful in order
|
|
* to discover other sentinels attached at the same master. */
|
|
void sentinelReceiveHelloMessages(redisAsyncContext *c, void *reply, void *privdata) {
|
|
sentinelRedisInstance *ri = privdata;
|
|
redisReply *r;
|
|
UNUSED(c);
|
|
|
|
if (!reply || !ri) return;
|
|
r = reply;
|
|
|
|
/* Update the last activity in the pubsub channel. Note that since we
|
|
* receive our messages as well this timestamp can be used to detect
|
|
* if the link is probably disconnected even if it seems otherwise. */
|
|
ri->link->pc_last_activity = mstime();
|
|
|
|
/* Sanity check in the reply we expect, so that the code that follows
|
|
* can avoid to check for details. */
|
|
if (r->type != REDIS_REPLY_ARRAY ||
|
|
r->elements != 3 ||
|
|
r->element[0]->type != REDIS_REPLY_STRING ||
|
|
r->element[1]->type != REDIS_REPLY_STRING ||
|
|
r->element[2]->type != REDIS_REPLY_STRING ||
|
|
strcmp(r->element[0]->str,"message") != 0) return;
|
|
|
|
/* We are not interested in meeting ourselves */
|
|
if (strstr(r->element[2]->str,sentinel.myid) != NULL) return;
|
|
|
|
sentinelProcessHelloMessage(r->element[2]->str, r->element[2]->len);
|
|
}
|
|
|
|
/* Send a "Hello" message via Pub/Sub to the specified 'ri' Redis
|
|
* instance in order to broadcast the current configuration for this
|
|
* master, and to advertise the existence of this Sentinel at the same time.
|
|
*
|
|
* The message has the following format:
|
|
*
|
|
* sentinel_ip,sentinel_port,sentinel_runid,current_epoch,
|
|
* master_name,master_ip,master_port,master_config_epoch.
|
|
*
|
|
* Returns C_OK if the PUBLISH was queued correctly, otherwise
|
|
* C_ERR is returned. */
|
|
int sentinelSendHello(sentinelRedisInstance *ri) {
|
|
char ip[NET_IP_STR_LEN];
|
|
char payload[NET_IP_STR_LEN+1024];
|
|
int retval;
|
|
char *announce_ip;
|
|
int announce_port;
|
|
sentinelRedisInstance *master = (ri->flags & SRI_MASTER) ? ri : ri->master;
|
|
sentinelAddr *master_addr = sentinelGetCurrentMasterAddress(master);
|
|
|
|
if (ri->link->disconnected) return C_ERR;
|
|
|
|
/* Use the specified announce address if specified, otherwise try to
|
|
* obtain our own IP address. */
|
|
if (sentinel.announce_ip) {
|
|
announce_ip = sentinel.announce_ip;
|
|
} else {
|
|
if (anetFdToString(ri->link->cc->c.fd,ip,sizeof(ip),NULL,FD_TO_SOCK_NAME) == -1)
|
|
return C_ERR;
|
|
announce_ip = ip;
|
|
}
|
|
if (sentinel.announce_port) announce_port = sentinel.announce_port;
|
|
else if (server.tls_replication && server.tls_port) announce_port = server.tls_port;
|
|
else announce_port = server.port;
|
|
|
|
/* Format and send the Hello message. */
|
|
snprintf(payload,sizeof(payload),
|
|
"%s,%d,%s,%llu," /* Info about this sentinel. */
|
|
"%s,%s,%d,%llu", /* Info about current master. */
|
|
announce_ip, announce_port, sentinel.myid,
|
|
(unsigned long long) sentinel.current_epoch,
|
|
/* --- */
|
|
master->name,announceSentinelAddr(master_addr),master_addr->port,
|
|
(unsigned long long) master->config_epoch);
|
|
retval = redisAsyncCommand(ri->link->cc,
|
|
sentinelPublishReplyCallback, ri, "%s %s %s",
|
|
sentinelInstanceMapCommand(ri,"PUBLISH"),
|
|
SENTINEL_HELLO_CHANNEL,payload);
|
|
if (retval != C_OK) return C_ERR;
|
|
ri->link->pending_commands++;
|
|
return C_OK;
|
|
}
|
|
|
|
/* Reset last_pub_time in all the instances in the specified dictionary
|
|
* in order to force the delivery of a Hello update ASAP. */
|
|
void sentinelForceHelloUpdateDictOfRedisInstances(dict *instances) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
|
|
di = dictGetSafeIterator(instances);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
if (ri->last_pub_time >= (sentinel_publish_period+1))
|
|
ri->last_pub_time -= (sentinel_publish_period+1);
|
|
}
|
|
dictReleaseIterator(di);
|
|
}
|
|
|
|
/* This function forces the delivery of a "Hello" message (see
|
|
* sentinelSendHello() top comment for further information) to all the Redis
|
|
* and Sentinel instances related to the specified 'master'.
|
|
*
|
|
* It is technically not needed since we send an update to every instance
|
|
* with a period of SENTINEL_PUBLISH_PERIOD milliseconds, however when a
|
|
* Sentinel upgrades a configuration it is a good idea to deliver an update
|
|
* to the other Sentinels ASAP. */
|
|
int sentinelForceHelloUpdateForMaster(sentinelRedisInstance *master) {
|
|
if (!(master->flags & SRI_MASTER)) return C_ERR;
|
|
if (master->last_pub_time >= (sentinel_publish_period+1))
|
|
master->last_pub_time -= (sentinel_publish_period+1);
|
|
sentinelForceHelloUpdateDictOfRedisInstances(master->sentinels);
|
|
sentinelForceHelloUpdateDictOfRedisInstances(master->slaves);
|
|
return C_OK;
|
|
}
|
|
|
|
/* Send a PING to the specified instance and refresh the act_ping_time
|
|
* if it is zero (that is, if we received a pong for the previous ping).
|
|
*
|
|
* On error zero is returned, and we can't consider the PING command
|
|
* queued in the connection. */
|
|
int sentinelSendPing(sentinelRedisInstance *ri) {
|
|
int retval = redisAsyncCommand(ri->link->cc,
|
|
sentinelPingReplyCallback, ri, "%s",
|
|
sentinelInstanceMapCommand(ri,"PING"));
|
|
if (retval == C_OK) {
|
|
ri->link->pending_commands++;
|
|
ri->link->last_ping_time = mstime();
|
|
/* We update the active ping time only if we received the pong for
|
|
* the previous ping, otherwise we are technically waiting since the
|
|
* first ping that did not receive a reply. */
|
|
if (ri->link->act_ping_time == 0)
|
|
ri->link->act_ping_time = ri->link->last_ping_time;
|
|
return 1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Send periodic PING, INFO, and PUBLISH to the Hello channel to
|
|
* the specified master or slave instance. */
|
|
void sentinelSendPeriodicCommands(sentinelRedisInstance *ri) {
|
|
mstime_t now = mstime();
|
|
mstime_t info_period, ping_period;
|
|
int retval;
|
|
|
|
/* Return ASAP if we have already a PING or INFO already pending, or
|
|
* in the case the instance is not properly connected. */
|
|
if (ri->link->disconnected) return;
|
|
|
|
/* For INFO, PING, PUBLISH that are not critical commands to send we
|
|
* also have a limit of SENTINEL_MAX_PENDING_COMMANDS. We don't
|
|
* want to use a lot of memory just because a link is not working
|
|
* properly (note that anyway there is a redundant protection about this,
|
|
* that is, the link will be disconnected and reconnected if a long
|
|
* timeout condition is detected. */
|
|
if (ri->link->pending_commands >=
|
|
SENTINEL_MAX_PENDING_COMMANDS * ri->link->refcount) return;
|
|
|
|
/* If this is a slave of a master in O_DOWN condition we start sending
|
|
* it INFO every second, instead of the usual SENTINEL_INFO_PERIOD
|
|
* period. In this state we want to closely monitor slaves in case they
|
|
* are turned into masters by another Sentinel, or by the sysadmin.
|
|
*
|
|
* Similarly we monitor the INFO output more often if the slave reports
|
|
* to be disconnected from the master, so that we can have a fresh
|
|
* disconnection time figure. */
|
|
if ((ri->flags & SRI_SLAVE) &&
|
|
((ri->master->flags & (SRI_O_DOWN|SRI_FAILOVER_IN_PROGRESS)) ||
|
|
(ri->master_link_down_time != 0)))
|
|
{
|
|
info_period = 1000;
|
|
} else {
|
|
info_period = sentinel_info_period;
|
|
}
|
|
|
|
/* We ping instances every time the last received pong is older than
|
|
* the configured 'down-after-milliseconds' time, but every second
|
|
* anyway if 'down-after-milliseconds' is greater than 1 second. */
|
|
ping_period = ri->down_after_period;
|
|
if (ping_period > sentinel_ping_period) ping_period = sentinel_ping_period;
|
|
|
|
/* Send INFO to masters and slaves, not sentinels. */
|
|
if ((ri->flags & SRI_SENTINEL) == 0 &&
|
|
(ri->info_refresh == 0 ||
|
|
(now - ri->info_refresh) > info_period))
|
|
{
|
|
retval = redisAsyncCommand(ri->link->cc,
|
|
sentinelInfoReplyCallback, ri, "%s",
|
|
sentinelInstanceMapCommand(ri,"INFO"));
|
|
if (retval == C_OK) ri->link->pending_commands++;
|
|
}
|
|
|
|
/* Send PING to all the three kinds of instances. */
|
|
if ((now - ri->link->last_pong_time) > ping_period &&
|
|
(now - ri->link->last_ping_time) > ping_period/2) {
|
|
sentinelSendPing(ri);
|
|
}
|
|
|
|
/* PUBLISH hello messages to all the three kinds of instances. */
|
|
if ((now - ri->last_pub_time) > sentinel_publish_period) {
|
|
sentinelSendHello(ri);
|
|
}
|
|
}
|
|
|
|
/* =========================== SENTINEL command ============================= */
|
|
|
|
/* SENTINEL CONFIG SET <option> */
|
|
void sentinelConfigSetCommand(client *c) {
|
|
robj *o = c->argv[3];
|
|
robj *val = c->argv[4];
|
|
long long numval;
|
|
int drop_conns = 0;
|
|
|
|
if (!strcasecmp(o->ptr, "resolve-hostnames")) {
|
|
if ((numval = yesnotoi(val->ptr)) == -1) goto badfmt;
|
|
sentinel.resolve_hostnames = numval;
|
|
} else if (!strcasecmp(o->ptr, "announce-hostnames")) {
|
|
if ((numval = yesnotoi(val->ptr)) == -1) goto badfmt;
|
|
sentinel.announce_hostnames = numval;
|
|
} else if (!strcasecmp(o->ptr, "announce-ip")) {
|
|
if (sentinel.announce_ip) sdsfree(sentinel.announce_ip);
|
|
sentinel.announce_ip = sdsnew(val->ptr);
|
|
} else if (!strcasecmp(o->ptr, "announce-port")) {
|
|
if (getLongLongFromObject(val, &numval) == C_ERR ||
|
|
numval < 0 || numval > 65535)
|
|
goto badfmt;
|
|
sentinel.announce_port = numval;
|
|
} else if (!strcasecmp(o->ptr, "sentinel-user")) {
|
|
sdsfree(sentinel.sentinel_auth_user);
|
|
sentinel.sentinel_auth_user = sdslen(val->ptr) == 0 ?
|
|
NULL : sdsdup(val->ptr);
|
|
drop_conns = 1;
|
|
} else if (!strcasecmp(o->ptr, "sentinel-pass")) {
|
|
sdsfree(sentinel.sentinel_auth_pass);
|
|
sentinel.sentinel_auth_pass = sdslen(val->ptr) == 0 ?
|
|
NULL : sdsdup(val->ptr);
|
|
drop_conns = 1;
|
|
} else {
|
|
addReplyErrorFormat(c, "Invalid argument '%s' to SENTINEL CONFIG SET",
|
|
(char *) o->ptr);
|
|
return;
|
|
}
|
|
|
|
sentinelFlushConfigAndReply(c);
|
|
|
|
/* Drop Sentinel connections to initiate a reconnect if needed. */
|
|
if (drop_conns)
|
|
sentinelDropConnections();
|
|
|
|
return;
|
|
|
|
badfmt:
|
|
addReplyErrorFormat(c, "Invalid value '%s' to SENTINEL CONFIG SET '%s'",
|
|
(char *) val->ptr, (char *) o->ptr);
|
|
}
|
|
|
|
/* SENTINEL CONFIG GET <option> */
|
|
void sentinelConfigGetCommand(client *c) {
|
|
robj *o = c->argv[3];
|
|
const char *pattern = o->ptr;
|
|
void *replylen = addReplyDeferredLen(c);
|
|
int matches = 0;
|
|
|
|
if (stringmatch(pattern,"resolve-hostnames",1)) {
|
|
addReplyBulkCString(c,"resolve-hostnames");
|
|
addReplyBulkCString(c,sentinel.resolve_hostnames ? "yes" : "no");
|
|
matches++;
|
|
}
|
|
|
|
if (stringmatch(pattern, "announce-hostnames", 1)) {
|
|
addReplyBulkCString(c,"announce-hostnames");
|
|
addReplyBulkCString(c,sentinel.announce_hostnames ? "yes" : "no");
|
|
matches++;
|
|
}
|
|
|
|
if (stringmatch(pattern, "announce-ip", 1)) {
|
|
addReplyBulkCString(c,"announce-ip");
|
|
addReplyBulkCString(c,sentinel.announce_ip ? sentinel.announce_ip : "");
|
|
matches++;
|
|
}
|
|
|
|
if (stringmatch(pattern, "announce-port", 1)) {
|
|
addReplyBulkCString(c, "announce-port");
|
|
addReplyBulkLongLong(c, sentinel.announce_port);
|
|
matches++;
|
|
}
|
|
|
|
if (stringmatch(pattern, "sentinel-user", 1)) {
|
|
addReplyBulkCString(c, "sentinel-user");
|
|
addReplyBulkCString(c, sentinel.sentinel_auth_user ? sentinel.sentinel_auth_user : "");
|
|
matches++;
|
|
}
|
|
|
|
if (stringmatch(pattern, "sentinel-pass", 1)) {
|
|
addReplyBulkCString(c, "sentinel-pass");
|
|
addReplyBulkCString(c, sentinel.sentinel_auth_pass ? sentinel.sentinel_auth_pass : "");
|
|
matches++;
|
|
}
|
|
|
|
setDeferredMapLen(c, replylen, matches);
|
|
}
|
|
|
|
const char *sentinelFailoverStateStr(int state) {
|
|
switch(state) {
|
|
case SENTINEL_FAILOVER_STATE_NONE: return "none";
|
|
case SENTINEL_FAILOVER_STATE_WAIT_START: return "wait_start";
|
|
case SENTINEL_FAILOVER_STATE_SELECT_SLAVE: return "select_slave";
|
|
case SENTINEL_FAILOVER_STATE_SEND_SLAVEOF_NOONE: return "send_slaveof_noone";
|
|
case SENTINEL_FAILOVER_STATE_WAIT_PROMOTION: return "wait_promotion";
|
|
case SENTINEL_FAILOVER_STATE_RECONF_SLAVES: return "reconf_slaves";
|
|
case SENTINEL_FAILOVER_STATE_UPDATE_CONFIG: return "update_config";
|
|
default: return "unknown";
|
|
}
|
|
}
|
|
|
|
/* Redis instance to Redis protocol representation. */
|
|
void addReplySentinelRedisInstance(client *c, sentinelRedisInstance *ri) {
|
|
char *flags = sdsempty();
|
|
void *mbl;
|
|
int fields = 0;
|
|
|
|
mbl = addReplyDeferredLen(c);
|
|
|
|
addReplyBulkCString(c,"name");
|
|
addReplyBulkCString(c,ri->name);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"ip");
|
|
addReplyBulkCString(c,announceSentinelAddr(ri->addr));
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"port");
|
|
addReplyBulkLongLong(c,ri->addr->port);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"runid");
|
|
addReplyBulkCString(c,ri->runid ? ri->runid : "");
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"flags");
|
|
if (ri->flags & SRI_S_DOWN) flags = sdscat(flags,"s_down,");
|
|
if (ri->flags & SRI_O_DOWN) flags = sdscat(flags,"o_down,");
|
|
if (ri->flags & SRI_MASTER) flags = sdscat(flags,"master,");
|
|
if (ri->flags & SRI_SLAVE) flags = sdscat(flags,"slave,");
|
|
if (ri->flags & SRI_SENTINEL) flags = sdscat(flags,"sentinel,");
|
|
if (ri->link->disconnected) flags = sdscat(flags,"disconnected,");
|
|
if (ri->flags & SRI_MASTER_DOWN) flags = sdscat(flags,"master_down,");
|
|
if (ri->flags & SRI_FAILOVER_IN_PROGRESS)
|
|
flags = sdscat(flags,"failover_in_progress,");
|
|
if (ri->flags & SRI_PROMOTED) flags = sdscat(flags,"promoted,");
|
|
if (ri->flags & SRI_RECONF_SENT) flags = sdscat(flags,"reconf_sent,");
|
|
if (ri->flags & SRI_RECONF_INPROG) flags = sdscat(flags,"reconf_inprog,");
|
|
if (ri->flags & SRI_RECONF_DONE) flags = sdscat(flags,"reconf_done,");
|
|
if (ri->flags & SRI_FORCE_FAILOVER) flags = sdscat(flags,"force_failover,");
|
|
if (ri->flags & SRI_SCRIPT_KILL_SENT) flags = sdscat(flags,"script_kill_sent,");
|
|
|
|
if (sdslen(flags) != 0) sdsrange(flags,0,-2); /* remove last "," */
|
|
addReplyBulkCString(c,flags);
|
|
sdsfree(flags);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"link-pending-commands");
|
|
addReplyBulkLongLong(c,ri->link->pending_commands);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"link-refcount");
|
|
addReplyBulkLongLong(c,ri->link->refcount);
|
|
fields++;
|
|
|
|
if (ri->flags & SRI_FAILOVER_IN_PROGRESS) {
|
|
addReplyBulkCString(c,"failover-state");
|
|
addReplyBulkCString(c,(char*)sentinelFailoverStateStr(ri->failover_state));
|
|
fields++;
|
|
}
|
|
|
|
addReplyBulkCString(c,"last-ping-sent");
|
|
addReplyBulkLongLong(c,
|
|
ri->link->act_ping_time ? (mstime() - ri->link->act_ping_time) : 0);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"last-ok-ping-reply");
|
|
addReplyBulkLongLong(c,mstime() - ri->link->last_avail_time);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"last-ping-reply");
|
|
addReplyBulkLongLong(c,mstime() - ri->link->last_pong_time);
|
|
fields++;
|
|
|
|
if (ri->flags & SRI_S_DOWN) {
|
|
addReplyBulkCString(c,"s-down-time");
|
|
addReplyBulkLongLong(c,mstime()-ri->s_down_since_time);
|
|
fields++;
|
|
}
|
|
|
|
if (ri->flags & SRI_O_DOWN) {
|
|
addReplyBulkCString(c,"o-down-time");
|
|
addReplyBulkLongLong(c,mstime()-ri->o_down_since_time);
|
|
fields++;
|
|
}
|
|
|
|
addReplyBulkCString(c,"down-after-milliseconds");
|
|
addReplyBulkLongLong(c,ri->down_after_period);
|
|
fields++;
|
|
|
|
/* Masters and Slaves */
|
|
if (ri->flags & (SRI_MASTER|SRI_SLAVE)) {
|
|
addReplyBulkCString(c,"info-refresh");
|
|
addReplyBulkLongLong(c,
|
|
ri->info_refresh ? (mstime() - ri->info_refresh) : 0);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"role-reported");
|
|
addReplyBulkCString(c, (ri->role_reported == SRI_MASTER) ? "master" :
|
|
"slave");
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"role-reported-time");
|
|
addReplyBulkLongLong(c,mstime() - ri->role_reported_time);
|
|
fields++;
|
|
}
|
|
|
|
/* Only masters */
|
|
if (ri->flags & SRI_MASTER) {
|
|
addReplyBulkCString(c,"config-epoch");
|
|
addReplyBulkLongLong(c,ri->config_epoch);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"num-slaves");
|
|
addReplyBulkLongLong(c,dictSize(ri->slaves));
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"num-other-sentinels");
|
|
addReplyBulkLongLong(c,dictSize(ri->sentinels));
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"quorum");
|
|
addReplyBulkLongLong(c,ri->quorum);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"failover-timeout");
|
|
addReplyBulkLongLong(c,ri->failover_timeout);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"parallel-syncs");
|
|
addReplyBulkLongLong(c,ri->parallel_syncs);
|
|
fields++;
|
|
|
|
if (ri->notification_script) {
|
|
addReplyBulkCString(c,"notification-script");
|
|
addReplyBulkCString(c,ri->notification_script);
|
|
fields++;
|
|
}
|
|
|
|
if (ri->client_reconfig_script) {
|
|
addReplyBulkCString(c,"client-reconfig-script");
|
|
addReplyBulkCString(c,ri->client_reconfig_script);
|
|
fields++;
|
|
}
|
|
}
|
|
|
|
/* Only slaves */
|
|
if (ri->flags & SRI_SLAVE) {
|
|
addReplyBulkCString(c,"master-link-down-time");
|
|
addReplyBulkLongLong(c,ri->master_link_down_time);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"master-link-status");
|
|
addReplyBulkCString(c,
|
|
(ri->slave_master_link_status == SENTINEL_MASTER_LINK_STATUS_UP) ?
|
|
"ok" : "err");
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"master-host");
|
|
addReplyBulkCString(c,
|
|
ri->slave_master_host ? ri->slave_master_host : "?");
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"master-port");
|
|
addReplyBulkLongLong(c,ri->slave_master_port);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"slave-priority");
|
|
addReplyBulkLongLong(c,ri->slave_priority);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"slave-repl-offset");
|
|
addReplyBulkLongLong(c,ri->slave_repl_offset);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"replica-announced");
|
|
addReplyBulkLongLong(c,ri->replica_announced);
|
|
fields++;
|
|
}
|
|
|
|
/* Only sentinels */
|
|
if (ri->flags & SRI_SENTINEL) {
|
|
addReplyBulkCString(c,"last-hello-message");
|
|
addReplyBulkLongLong(c,mstime() - ri->last_hello_time);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"voted-leader");
|
|
addReplyBulkCString(c,ri->leader ? ri->leader : "?");
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"voted-leader-epoch");
|
|
addReplyBulkLongLong(c,ri->leader_epoch);
|
|
fields++;
|
|
}
|
|
|
|
setDeferredMapLen(c,mbl,fields);
|
|
}
|
|
|
|
void sentinelSetDebugConfigParameters(client *c){
|
|
int j;
|
|
int badarg = 0; /* Bad argument position for error reporting. */
|
|
char *option;
|
|
|
|
/* Process option - value pairs. */
|
|
for (j = 2; j < c->argc; j++) {
|
|
int moreargs = (c->argc-1) - j;
|
|
option = c->argv[j]->ptr;
|
|
long long ll;
|
|
|
|
if (!strcasecmp(option,"info-period") && moreargs > 0) {
|
|
/* info-period <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
sentinel_info_period = ll;
|
|
|
|
} else if (!strcasecmp(option,"ping-period") && moreargs > 0) {
|
|
/* ping-period <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
sentinel_ping_period = ll;
|
|
|
|
} else if (!strcasecmp(option,"ask-period") && moreargs > 0) {
|
|
/* ask-period <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
sentinel_ask_period = ll;
|
|
|
|
} else if (!strcasecmp(option,"publish-period") && moreargs > 0) {
|
|
/* publish-period <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
sentinel_publish_period = ll;
|
|
|
|
} else if (!strcasecmp(option,"default-down-after") && moreargs > 0) {
|
|
/* default-down-after <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
sentinel_default_down_after = ll;
|
|
|
|
} else if (!strcasecmp(option,"tilt-trigger") && moreargs > 0) {
|
|
/* tilt-trigger <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
sentinel_tilt_trigger = ll;
|
|
|
|
} else if (!strcasecmp(option,"tilt-period") && moreargs > 0) {
|
|
/* tilt-period <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
sentinel_tilt_period = ll;
|
|
|
|
} else if (!strcasecmp(option,"slave-reconf-timeout") && moreargs > 0) {
|
|
/* slave-reconf-timeout <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
sentinel_slave_reconf_timeout = ll;
|
|
|
|
} else if (!strcasecmp(option,"min-link-reconnect-period") && moreargs > 0) {
|
|
/* min-link-reconnect-period <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
sentinel_min_link_reconnect_period = ll;
|
|
|
|
} else if (!strcasecmp(option,"default-failover-timeout") && moreargs > 0) {
|
|
/* default-failover-timeout <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
sentinel_default_failover_timeout = ll;
|
|
|
|
} else if (!strcasecmp(option,"election-timeout") && moreargs > 0) {
|
|
/* election-timeout <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
sentinel_election_timeout = ll;
|
|
|
|
} else if (!strcasecmp(option,"script-max-runtime") && moreargs > 0) {
|
|
/* script-max-runtime <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
sentinel_script_max_runtime = ll;
|
|
|
|
} else if (!strcasecmp(option,"script-retry-delay") && moreargs > 0) {
|
|
/* script-retry-delay <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
sentinel_script_retry_delay = ll;
|
|
|
|
} else {
|
|
addReplyErrorFormat(c,"Unknown option or number of arguments for "
|
|
"SENTINEL DEBUG '%s'", option);
|
|
return;
|
|
}
|
|
}
|
|
|
|
addReply(c,shared.ok);
|
|
return;
|
|
|
|
badfmt: /* Bad format errors */
|
|
addReplyErrorFormat(c,"Invalid argument '%s' for SENTINEL DEBUG '%s'",
|
|
(char*)c->argv[badarg]->ptr,option);
|
|
|
|
return;
|
|
}
|
|
|
|
void addReplySentinelDebugInfo(client *c) {
|
|
void *mbl;
|
|
int fields = 0;
|
|
|
|
mbl = addReplyDeferredLen(c);
|
|
|
|
addReplyBulkCString(c,"INFO-PERIOD");
|
|
addReplyBulkLongLong(c,sentinel_info_period);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"PING-PERIOD");
|
|
addReplyBulkLongLong(c,sentinel_ping_period);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"ASK-PERIOD");
|
|
addReplyBulkLongLong(c,sentinel_ask_period);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"PUBLISH-PERIOD");
|
|
addReplyBulkLongLong(c,sentinel_publish_period);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"DEFAULT-DOWN-AFTER");
|
|
addReplyBulkLongLong(c,sentinel_default_down_after);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"DEFAULT-FAILOVER-TIMEOUT");
|
|
addReplyBulkLongLong(c,sentinel_default_failover_timeout);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"TILT-TRIGGER");
|
|
addReplyBulkLongLong(c,sentinel_tilt_trigger);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"TILT-PERIOD");
|
|
addReplyBulkLongLong(c,sentinel_tilt_period);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"SLAVE-RECONF-TIMEOUT");
|
|
addReplyBulkLongLong(c,sentinel_slave_reconf_timeout);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"MIN-LINK-RECONNECT-PERIOD");
|
|
addReplyBulkLongLong(c,sentinel_min_link_reconnect_period);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"ELECTION-TIMEOUT");
|
|
addReplyBulkLongLong(c,sentinel_election_timeout);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"SCRIPT-MAX-RUNTIME");
|
|
addReplyBulkLongLong(c,sentinel_script_max_runtime);
|
|
fields++;
|
|
|
|
addReplyBulkCString(c,"SCRIPT-RETRY-DELAY");
|
|
addReplyBulkLongLong(c,sentinel_script_retry_delay);
|
|
fields++;
|
|
|
|
setDeferredMapLen(c,mbl,fields);
|
|
}
|
|
|
|
/* Output a number of instances contained inside a dictionary as
|
|
* Redis protocol. */
|
|
void addReplyDictOfRedisInstances(client *c, dict *instances) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
long slaves = 0;
|
|
void *replylen = addReplyDeferredLen(c);
|
|
|
|
di = dictGetIterator(instances);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
|
|
/* don't announce unannounced replicas */
|
|
if (ri->flags & SRI_SLAVE && !ri->replica_announced) continue;
|
|
addReplySentinelRedisInstance(c,ri);
|
|
slaves++;
|
|
}
|
|
dictReleaseIterator(di);
|
|
setDeferredArrayLen(c, replylen, slaves);
|
|
}
|
|
|
|
/* Lookup the named master into sentinel.masters.
|
|
* If the master is not found reply to the client with an error and returns
|
|
* NULL. */
|
|
sentinelRedisInstance *sentinelGetMasterByNameOrReplyError(client *c,
|
|
robj *name)
|
|
{
|
|
sentinelRedisInstance *ri;
|
|
|
|
ri = dictFetchValue(sentinel.masters,name->ptr);
|
|
if (!ri) {
|
|
addReplyError(c,"No such master with that name");
|
|
return NULL;
|
|
}
|
|
return ri;
|
|
}
|
|
|
|
#define SENTINEL_ISQR_OK 0
|
|
#define SENTINEL_ISQR_NOQUORUM (1<<0)
|
|
#define SENTINEL_ISQR_NOAUTH (1<<1)
|
|
int sentinelIsQuorumReachable(sentinelRedisInstance *master, int *usableptr) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
int usable = 1; /* Number of usable Sentinels. Init to 1 to count myself. */
|
|
int result = SENTINEL_ISQR_OK;
|
|
int voters = dictSize(master->sentinels)+1; /* Known Sentinels + myself. */
|
|
|
|
di = dictGetIterator(master->sentinels);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
|
|
if (ri->flags & (SRI_S_DOWN|SRI_O_DOWN)) continue;
|
|
usable++;
|
|
}
|
|
dictReleaseIterator(di);
|
|
|
|
if (usable < (int)master->quorum) result |= SENTINEL_ISQR_NOQUORUM;
|
|
if (usable < voters/2+1) result |= SENTINEL_ISQR_NOAUTH;
|
|
if (usableptr) *usableptr = usable;
|
|
return result;
|
|
}
|
|
|
|
void sentinelCommand(client *c) {
|
|
if (c->argc == 2 && !strcasecmp(c->argv[1]->ptr,"help")) {
|
|
const char *help[] = {
|
|
"CKQUORUM <master-name>",
|
|
" Check if the current Sentinel configuration is able to reach the quorum",
|
|
" needed to failover a master and the majority needed to authorize the",
|
|
" failover.",
|
|
"CONFIG SET <param> <value>",
|
|
" Set a global Sentinel configuration parameter.",
|
|
"CONFIG GET <param>",
|
|
" Get global Sentinel configuration parameter.",
|
|
"DEBUG [<param> <value> ...]",
|
|
" Show a list of configurable time parameters and their values (milliseconds).",
|
|
" Or update current configurable parameters values (one or more).",
|
|
"GET-MASTER-ADDR-BY-NAME <master-name>",
|
|
" Return the ip and port number of the master with that name.",
|
|
"FAILOVER <master-name>",
|
|
" Manually failover a master node without asking for agreement from other",
|
|
" Sentinels",
|
|
"FLUSHCONFIG",
|
|
" Force Sentinel to rewrite its configuration on disk, including the current",
|
|
" Sentinel state.",
|
|
"INFO-CACHE <master-name>",
|
|
" Return last cached INFO output from masters and all its replicas.",
|
|
"IS-MASTER-DOWN-BY-ADDR <ip> <port> <current-epoch> <runid>",
|
|
" Check if the master specified by ip:port is down from current Sentinel's",
|
|
" point of view.",
|
|
"MASTER <master-name>",
|
|
" Show the state and info of the specified master.",
|
|
"MASTERS",
|
|
" Show a list of monitored masters and their state.",
|
|
"MONITOR <name> <ip> <port> <quorum>",
|
|
" Start monitoring a new master with the specified name, ip, port and quorum.",
|
|
"MYID",
|
|
" Return the ID of the Sentinel instance.",
|
|
"PENDING-SCRIPTS",
|
|
" Get pending scripts information.",
|
|
"REMOVE <master-name>",
|
|
" Remove master from Sentinel's monitor list.",
|
|
"REPLICAS <master-name>",
|
|
" Show a list of replicas for this master and their state.",
|
|
"RESET <pattern>",
|
|
" Reset masters for specific master name matching this pattern.",
|
|
"SENTINELS <master-name>",
|
|
" Show a list of Sentinel instances for this master and their state.",
|
|
"SET <master-name> <option> <value> [<option> <value> ...]",
|
|
" Set configuration parameters for certain masters.",
|
|
"SIMULATE-FAILURE [CRASH-AFTER-ELECTION] [CRASH-AFTER-PROMOTION] [HELP]",
|
|
" Simulate a Sentinel crash.",
|
|
NULL
|
|
};
|
|
addReplyHelp(c, help);
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"masters")) {
|
|
/* SENTINEL MASTERS */
|
|
if (c->argc != 2) goto numargserr;
|
|
addReplyDictOfRedisInstances(c,sentinel.masters);
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"master")) {
|
|
/* SENTINEL MASTER <name> */
|
|
sentinelRedisInstance *ri;
|
|
|
|
if (c->argc != 3) goto numargserr;
|
|
if ((ri = sentinelGetMasterByNameOrReplyError(c,c->argv[2]))
|
|
== NULL) return;
|
|
addReplySentinelRedisInstance(c,ri);
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"slaves") ||
|
|
!strcasecmp(c->argv[1]->ptr,"replicas"))
|
|
{
|
|
/* SENTINEL REPLICAS <master-name> */
|
|
sentinelRedisInstance *ri;
|
|
|
|
if (c->argc != 3) goto numargserr;
|
|
if ((ri = sentinelGetMasterByNameOrReplyError(c,c->argv[2])) == NULL)
|
|
return;
|
|
addReplyDictOfRedisInstances(c,ri->slaves);
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"sentinels")) {
|
|
/* SENTINEL SENTINELS <master-name> */
|
|
sentinelRedisInstance *ri;
|
|
|
|
if (c->argc != 3) goto numargserr;
|
|
if ((ri = sentinelGetMasterByNameOrReplyError(c,c->argv[2])) == NULL)
|
|
return;
|
|
addReplyDictOfRedisInstances(c,ri->sentinels);
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"myid") && c->argc == 2) {
|
|
/* SENTINEL MYID */
|
|
addReplyBulkCBuffer(c,sentinel.myid,CONFIG_RUN_ID_SIZE);
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"is-master-down-by-addr")) {
|
|
/* SENTINEL IS-MASTER-DOWN-BY-ADDR <ip> <port> <current-epoch> <runid>
|
|
*
|
|
* Arguments:
|
|
*
|
|
* ip and port are the ip and port of the master we want to be
|
|
* checked by Sentinel. Note that the command will not check by
|
|
* name but just by master, in theory different Sentinels may monitor
|
|
* different masters with the same name.
|
|
*
|
|
* current-epoch is needed in order to understand if we are allowed
|
|
* to vote for a failover leader or not. Each Sentinel can vote just
|
|
* one time per epoch.
|
|
*
|
|
* runid is "*" if we are not seeking for a vote from the Sentinel
|
|
* in order to elect the failover leader. Otherwise it is set to the
|
|
* runid we want the Sentinel to vote if it did not already voted.
|
|
*/
|
|
sentinelRedisInstance *ri;
|
|
long long req_epoch;
|
|
uint64_t leader_epoch = 0;
|
|
char *leader = NULL;
|
|
long port;
|
|
int isdown = 0;
|
|
|
|
if (c->argc != 6) goto numargserr;
|
|
if (getLongFromObjectOrReply(c,c->argv[3],&port,NULL) != C_OK ||
|
|
getLongLongFromObjectOrReply(c,c->argv[4],&req_epoch,NULL)
|
|
!= C_OK)
|
|
return;
|
|
ri = getSentinelRedisInstanceByAddrAndRunID(sentinel.masters,
|
|
c->argv[2]->ptr,port,NULL);
|
|
|
|
/* It exists? Is actually a master? Is subjectively down? It's down.
|
|
* Note: if we are in tilt mode we always reply with "0". */
|
|
if (!sentinel.tilt && ri && (ri->flags & SRI_S_DOWN) &&
|
|
(ri->flags & SRI_MASTER))
|
|
isdown = 1;
|
|
|
|
/* Vote for the master (or fetch the previous vote) if the request
|
|
* includes a runid, otherwise the sender is not seeking for a vote. */
|
|
if (ri && ri->flags & SRI_MASTER && strcasecmp(c->argv[5]->ptr,"*")) {
|
|
leader = sentinelVoteLeader(ri,(uint64_t)req_epoch,
|
|
c->argv[5]->ptr,
|
|
&leader_epoch);
|
|
}
|
|
|
|
/* Reply with a three-elements multi-bulk reply:
|
|
* down state, leader, vote epoch. */
|
|
addReplyArrayLen(c,3);
|
|
addReply(c, isdown ? shared.cone : shared.czero);
|
|
addReplyBulkCString(c, leader ? leader : "*");
|
|
addReplyLongLong(c, (long long)leader_epoch);
|
|
if (leader) sdsfree(leader);
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"reset")) {
|
|
/* SENTINEL RESET <pattern> */
|
|
if (c->argc != 3) goto numargserr;
|
|
addReplyLongLong(c,sentinelResetMastersByPattern(c->argv[2]->ptr,SENTINEL_GENERATE_EVENT));
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"get-master-addr-by-name")) {
|
|
/* SENTINEL GET-MASTER-ADDR-BY-NAME <master-name> */
|
|
sentinelRedisInstance *ri;
|
|
|
|
if (c->argc != 3) goto numargserr;
|
|
ri = sentinelGetMasterByName(c->argv[2]->ptr);
|
|
if (ri == NULL) {
|
|
addReplyNullArray(c);
|
|
} else {
|
|
sentinelAddr *addr = sentinelGetCurrentMasterAddress(ri);
|
|
|
|
addReplyArrayLen(c,2);
|
|
addReplyBulkCString(c,announceSentinelAddr(addr));
|
|
addReplyBulkLongLong(c,addr->port);
|
|
}
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"failover")) {
|
|
/* SENTINEL FAILOVER <master-name> */
|
|
sentinelRedisInstance *ri;
|
|
|
|
if (c->argc != 3) goto numargserr;
|
|
if ((ri = sentinelGetMasterByNameOrReplyError(c,c->argv[2])) == NULL)
|
|
return;
|
|
if (ri->flags & SRI_FAILOVER_IN_PROGRESS) {
|
|
addReplyError(c,"-INPROG Failover already in progress");
|
|
return;
|
|
}
|
|
if (sentinelSelectSlave(ri) == NULL) {
|
|
addReplyError(c,"-NOGOODSLAVE No suitable replica to promote");
|
|
return;
|
|
}
|
|
serverLog(LL_WARNING,"Executing user requested FAILOVER of '%s'",
|
|
ri->name);
|
|
sentinelStartFailover(ri);
|
|
ri->flags |= SRI_FORCE_FAILOVER;
|
|
addReply(c,shared.ok);
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"pending-scripts")) {
|
|
/* SENTINEL PENDING-SCRIPTS */
|
|
|
|
if (c->argc != 2) goto numargserr;
|
|
sentinelPendingScriptsCommand(c);
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"monitor")) {
|
|
/* SENTINEL MONITOR <name> <ip> <port> <quorum> */
|
|
sentinelRedisInstance *ri;
|
|
long quorum, port;
|
|
char ip[NET_IP_STR_LEN];
|
|
|
|
if (c->argc != 6) goto numargserr;
|
|
if (getLongFromObjectOrReply(c,c->argv[5],&quorum,"Invalid quorum")
|
|
!= C_OK) return;
|
|
if (getLongFromObjectOrReply(c,c->argv[4],&port,"Invalid port")
|
|
!= C_OK) return;
|
|
|
|
if (quorum <= 0) {
|
|
addReplyError(c, "Quorum must be 1 or greater.");
|
|
return;
|
|
}
|
|
|
|
/* If resolve-hostnames is used, actual DNS resolution may take place.
|
|
* Otherwise just validate address.
|
|
*/
|
|
if (anetResolve(NULL,c->argv[3]->ptr,ip,sizeof(ip),
|
|
sentinel.resolve_hostnames ? ANET_NONE : ANET_IP_ONLY) == ANET_ERR) {
|
|
addReplyError(c, "Invalid IP address or hostname specified");
|
|
return;
|
|
}
|
|
|
|
/* Parameters are valid. Try to create the master instance. */
|
|
ri = createSentinelRedisInstance(c->argv[2]->ptr,SRI_MASTER,
|
|
c->argv[3]->ptr,port,quorum,NULL);
|
|
if (ri == NULL) {
|
|
addReplyError(c,sentinelCheckCreateInstanceErrors(SRI_MASTER));
|
|
} else {
|
|
sentinelFlushConfigAndReply(c);
|
|
sentinelEvent(LL_WARNING,"+monitor",ri,"%@ quorum %d",ri->quorum);
|
|
}
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"flushconfig")) {
|
|
if (c->argc != 2) goto numargserr;
|
|
sentinelFlushConfigAndReply(c);
|
|
return;
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"remove")) {
|
|
/* SENTINEL REMOVE <name> */
|
|
sentinelRedisInstance *ri;
|
|
|
|
if (c->argc != 3) goto numargserr;
|
|
if ((ri = sentinelGetMasterByNameOrReplyError(c,c->argv[2]))
|
|
== NULL) return;
|
|
sentinelEvent(LL_WARNING,"-monitor",ri,"%@");
|
|
dictDelete(sentinel.masters,c->argv[2]->ptr);
|
|
sentinelFlushConfigAndReply(c);
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"ckquorum")) {
|
|
/* SENTINEL CKQUORUM <name> */
|
|
sentinelRedisInstance *ri;
|
|
int usable;
|
|
|
|
if (c->argc != 3) goto numargserr;
|
|
if ((ri = sentinelGetMasterByNameOrReplyError(c,c->argv[2]))
|
|
== NULL) return;
|
|
int result = sentinelIsQuorumReachable(ri,&usable);
|
|
if (result == SENTINEL_ISQR_OK) {
|
|
addReplySds(c, sdscatfmt(sdsempty(),
|
|
"+OK %i usable Sentinels. Quorum and failover authorization "
|
|
"can be reached\r\n",usable));
|
|
} else {
|
|
sds e = sdscatfmt(sdsempty(),
|
|
"-NOQUORUM %i usable Sentinels. ",usable);
|
|
if (result & SENTINEL_ISQR_NOQUORUM)
|
|
e = sdscat(e,"Not enough available Sentinels to reach the"
|
|
" specified quorum for this master");
|
|
if (result & SENTINEL_ISQR_NOAUTH) {
|
|
if (result & SENTINEL_ISQR_NOQUORUM) e = sdscat(e,". ");
|
|
e = sdscat(e, "Not enough available Sentinels to reach the"
|
|
" majority and authorize a failover");
|
|
}
|
|
addReplyErrorSds(c,e);
|
|
}
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"set")) {
|
|
sentinelSetCommand(c);
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"config")) {
|
|
if (c->argc < 3) goto numargserr;
|
|
if (!strcasecmp(c->argv[2]->ptr,"set") && c->argc == 5)
|
|
sentinelConfigSetCommand(c);
|
|
else if (!strcasecmp(c->argv[2]->ptr,"get") && c->argc == 4)
|
|
sentinelConfigGetCommand(c);
|
|
else
|
|
addReplyError(c, "Only SENTINEL CONFIG GET <option> / SET <option> <value> are supported.");
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"info-cache")) {
|
|
/* SENTINEL INFO-CACHE <name> */
|
|
if (c->argc < 2) goto numargserr;
|
|
mstime_t now = mstime();
|
|
|
|
/* Create an ad-hoc dictionary type so that we can iterate
|
|
* a dictionary composed of just the master groups the user
|
|
* requested. */
|
|
dictType copy_keeper = instancesDictType;
|
|
copy_keeper.valDestructor = NULL;
|
|
dict *masters_local = sentinel.masters;
|
|
if (c->argc > 2) {
|
|
masters_local = dictCreate(©_keeper);
|
|
|
|
for (int i = 2; i < c->argc; i++) {
|
|
sentinelRedisInstance *ri;
|
|
ri = sentinelGetMasterByName(c->argv[i]->ptr);
|
|
if (!ri) continue; /* ignore non-existing names */
|
|
dictAdd(masters_local, ri->name, ri);
|
|
}
|
|
}
|
|
|
|
/* Reply format:
|
|
* 1.) master name
|
|
* 2.) 1.) info from master
|
|
* 2.) info from replica
|
|
* ...
|
|
* 3.) other master name
|
|
* ...
|
|
*/
|
|
addReplyArrayLen(c,dictSize(masters_local) * 2);
|
|
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
di = dictGetIterator(masters_local);
|
|
while ((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
addReplyBulkCBuffer(c,ri->name,strlen(ri->name));
|
|
addReplyArrayLen(c,dictSize(ri->slaves) + 1); /* +1 for self */
|
|
addReplyArrayLen(c,2);
|
|
addReplyLongLong(c,
|
|
ri->info_refresh ? (now - ri->info_refresh) : 0);
|
|
if (ri->info)
|
|
addReplyBulkCBuffer(c,ri->info,sdslen(ri->info));
|
|
else
|
|
addReplyNull(c);
|
|
|
|
dictIterator *sdi;
|
|
dictEntry *sde;
|
|
sdi = dictGetIterator(ri->slaves);
|
|
while ((sde = dictNext(sdi)) != NULL) {
|
|
sentinelRedisInstance *sri = dictGetVal(sde);
|
|
addReplyArrayLen(c,2);
|
|
addReplyLongLong(c,
|
|
ri->info_refresh ? (now - sri->info_refresh) : 0);
|
|
if (sri->info)
|
|
addReplyBulkCBuffer(c,sri->info,sdslen(sri->info));
|
|
else
|
|
addReplyNull(c);
|
|
}
|
|
dictReleaseIterator(sdi);
|
|
}
|
|
dictReleaseIterator(di);
|
|
if (masters_local != sentinel.masters) dictRelease(masters_local);
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"simulate-failure")) {
|
|
/* SENTINEL SIMULATE-FAILURE [CRASH-AFTER-ELECTION] [CRASH-AFTER-PROMOTION] [HELP] */
|
|
int j;
|
|
|
|
sentinel.simfailure_flags = SENTINEL_SIMFAILURE_NONE;
|
|
for (j = 2; j < c->argc; j++) {
|
|
if (!strcasecmp(c->argv[j]->ptr,"crash-after-election")) {
|
|
sentinel.simfailure_flags |=
|
|
SENTINEL_SIMFAILURE_CRASH_AFTER_ELECTION;
|
|
serverLog(LL_WARNING,"Failure simulation: this Sentinel "
|
|
"will crash after being successfully elected as failover "
|
|
"leader");
|
|
} else if (!strcasecmp(c->argv[j]->ptr,"crash-after-promotion")) {
|
|
sentinel.simfailure_flags |=
|
|
SENTINEL_SIMFAILURE_CRASH_AFTER_PROMOTION;
|
|
serverLog(LL_WARNING,"Failure simulation: this Sentinel "
|
|
"will crash after promoting the selected replica to master");
|
|
} else if (!strcasecmp(c->argv[j]->ptr,"help")) {
|
|
addReplyArrayLen(c,2);
|
|
addReplyBulkCString(c,"crash-after-election");
|
|
addReplyBulkCString(c,"crash-after-promotion");
|
|
return;
|
|
} else {
|
|
addReplyError(c,"Unknown failure simulation specified");
|
|
return;
|
|
}
|
|
}
|
|
addReply(c,shared.ok);
|
|
} else if (!strcasecmp(c->argv[1]->ptr,"debug")) {
|
|
if(c->argc == 2)
|
|
addReplySentinelDebugInfo(c);
|
|
else
|
|
sentinelSetDebugConfigParameters(c);
|
|
}
|
|
else {
|
|
addReplySubcommandSyntaxError(c);
|
|
}
|
|
return;
|
|
|
|
numargserr:
|
|
addReplyErrorArity(c);
|
|
}
|
|
|
|
void addInfoSectionsToDict(dict *section_dict, char **sections);
|
|
|
|
/* SENTINEL INFO [section] */
|
|
void sentinelInfoCommand(client *c) {
|
|
char *sentinel_sections[] = {"server", "clients", "cpu", "stats", "sentinel", NULL};
|
|
int sec_all = 0, sec_everything = 0;
|
|
static dict *cached_all_info_sections = NULL;
|
|
|
|
/* Get requested section list. */
|
|
dict *sections_dict = genInfoSectionDict(c->argv+1, c->argc-1, sentinel_sections, &sec_all, &sec_everything);
|
|
|
|
/* Purge unsupported sections from the requested ones. */
|
|
dictEntry *de;
|
|
dictIterator *di = dictGetSafeIterator(sections_dict);
|
|
while((de = dictNext(di)) != NULL) {
|
|
int i;
|
|
sds sec = dictGetKey(de);
|
|
for (i=0; sentinel_sections[i]; i++)
|
|
if (!strcasecmp(sentinel_sections[i], sec))
|
|
break;
|
|
/* section not found? remove it */
|
|
if (!sentinel_sections[i])
|
|
dictDelete(sections_dict, sec);
|
|
}
|
|
dictReleaseIterator(di);
|
|
|
|
/* Insert explicit all sections (don't pass these vars to genRedisInfoString) */
|
|
if (sec_all || sec_everything) {
|
|
releaseInfoSectionDict(sections_dict);
|
|
/* We cache this dict as an optimization. */
|
|
if (!cached_all_info_sections) {
|
|
cached_all_info_sections = dictCreate(&stringSetDictType);
|
|
addInfoSectionsToDict(cached_all_info_sections, sentinel_sections);
|
|
}
|
|
sections_dict = cached_all_info_sections;
|
|
}
|
|
|
|
sds info = genRedisInfoString(sections_dict, 0, 0);
|
|
if (sec_all || (dictFind(sections_dict, "sentinel") != NULL)) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
int master_id = 0;
|
|
|
|
if (sdslen(info) != 0)
|
|
info = sdscat(info,"\r\n");
|
|
info = sdscatprintf(info,
|
|
"# Sentinel\r\n"
|
|
"sentinel_masters:%lu\r\n"
|
|
"sentinel_tilt:%d\r\n"
|
|
"sentinel_tilt_since_seconds:%jd\r\n"
|
|
"sentinel_running_scripts:%d\r\n"
|
|
"sentinel_scripts_queue_length:%ld\r\n"
|
|
"sentinel_simulate_failure_flags:%lu\r\n",
|
|
dictSize(sentinel.masters),
|
|
sentinel.tilt,
|
|
sentinel.tilt ? (intmax_t)((mstime()-sentinel.tilt_start_time)/1000) : -1,
|
|
sentinel.running_scripts,
|
|
listLength(sentinel.scripts_queue),
|
|
sentinel.simfailure_flags);
|
|
|
|
di = dictGetIterator(sentinel.masters);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
char *status = "ok";
|
|
|
|
if (ri->flags & SRI_O_DOWN) status = "odown";
|
|
else if (ri->flags & SRI_S_DOWN) status = "sdown";
|
|
info = sdscatprintf(info,
|
|
"master%d:name=%s,status=%s,address=%s:%d,"
|
|
"slaves=%lu,sentinels=%lu\r\n",
|
|
master_id++, ri->name, status,
|
|
announceSentinelAddr(ri->addr), ri->addr->port,
|
|
dictSize(ri->slaves),
|
|
dictSize(ri->sentinels)+1);
|
|
}
|
|
dictReleaseIterator(di);
|
|
}
|
|
if (sections_dict != cached_all_info_sections)
|
|
releaseInfoSectionDict(sections_dict);
|
|
addReplyBulkSds(c, info);
|
|
}
|
|
|
|
/* Implements Sentinel version of the ROLE command. The output is
|
|
* "sentinel" and the list of currently monitored master names. */
|
|
void sentinelRoleCommand(client *c) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
|
|
addReplyArrayLen(c,2);
|
|
addReplyBulkCBuffer(c,"sentinel",8);
|
|
addReplyArrayLen(c,dictSize(sentinel.masters));
|
|
|
|
di = dictGetIterator(sentinel.masters);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
|
|
addReplyBulkCString(c,ri->name);
|
|
}
|
|
dictReleaseIterator(di);
|
|
}
|
|
|
|
/* SENTINEL SET <mastername> [<option> <value> ...] */
|
|
void sentinelSetCommand(client *c) {
|
|
sentinelRedisInstance *ri;
|
|
int j, changes = 0;
|
|
int badarg = 0; /* Bad argument position for error reporting. */
|
|
char *option;
|
|
int redacted;
|
|
|
|
if ((ri = sentinelGetMasterByNameOrReplyError(c,c->argv[2]))
|
|
== NULL) return;
|
|
|
|
/* Process option - value pairs. */
|
|
for (j = 3; j < c->argc; j++) {
|
|
int moreargs = (c->argc-1) - j;
|
|
option = c->argv[j]->ptr;
|
|
long long ll;
|
|
int old_j = j; /* Used to know what to log as an event. */
|
|
redacted = 0;
|
|
|
|
if (!strcasecmp(option,"down-after-milliseconds") && moreargs > 0) {
|
|
/* down-after-milliseconds <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
ri->down_after_period = ll;
|
|
sentinelPropagateDownAfterPeriod(ri);
|
|
changes++;
|
|
} else if (!strcasecmp(option,"failover-timeout") && moreargs > 0) {
|
|
/* failover-timeout <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
ri->failover_timeout = ll;
|
|
changes++;
|
|
} else if (!strcasecmp(option,"parallel-syncs") && moreargs > 0) {
|
|
/* parallel-syncs <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
ri->parallel_syncs = ll;
|
|
changes++;
|
|
} else if (!strcasecmp(option,"notification-script") && moreargs > 0) {
|
|
/* notification-script <path> */
|
|
char *value = c->argv[++j]->ptr;
|
|
if (sentinel.deny_scripts_reconfig) {
|
|
addReplyError(c,
|
|
"Reconfiguration of scripts path is denied for "
|
|
"security reasons. Check the deny-scripts-reconfig "
|
|
"configuration directive in your Sentinel configuration");
|
|
goto seterr;
|
|
}
|
|
|
|
if (strlen(value) && access(value,X_OK) == -1) {
|
|
addReplyError(c,
|
|
"Notification script seems non existing or non executable");
|
|
goto seterr;
|
|
}
|
|
sdsfree(ri->notification_script);
|
|
ri->notification_script = strlen(value) ? sdsnew(value) : NULL;
|
|
changes++;
|
|
} else if (!strcasecmp(option,"client-reconfig-script") && moreargs > 0) {
|
|
/* client-reconfig-script <path> */
|
|
char *value = c->argv[++j]->ptr;
|
|
if (sentinel.deny_scripts_reconfig) {
|
|
addReplyError(c,
|
|
"Reconfiguration of scripts path is denied for "
|
|
"security reasons. Check the deny-scripts-reconfig "
|
|
"configuration directive in your Sentinel configuration");
|
|
goto seterr;
|
|
}
|
|
|
|
if (strlen(value) && access(value,X_OK) == -1) {
|
|
addReplyError(c,
|
|
"Client reconfiguration script seems non existing or "
|
|
"non executable");
|
|
goto seterr;
|
|
}
|
|
sdsfree(ri->client_reconfig_script);
|
|
ri->client_reconfig_script = strlen(value) ? sdsnew(value) : NULL;
|
|
changes++;
|
|
} else if (!strcasecmp(option,"auth-pass") && moreargs > 0) {
|
|
/* auth-pass <password> */
|
|
char *value = c->argv[++j]->ptr;
|
|
sdsfree(ri->auth_pass);
|
|
ri->auth_pass = strlen(value) ? sdsnew(value) : NULL;
|
|
dropInstanceConnections(ri);
|
|
changes++;
|
|
redacted = 1;
|
|
} else if (!strcasecmp(option,"auth-user") && moreargs > 0) {
|
|
/* auth-user <username> */
|
|
char *value = c->argv[++j]->ptr;
|
|
sdsfree(ri->auth_user);
|
|
ri->auth_user = strlen(value) ? sdsnew(value) : NULL;
|
|
dropInstanceConnections(ri);
|
|
changes++;
|
|
} else if (!strcasecmp(option,"quorum") && moreargs > 0) {
|
|
/* quorum <count> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll <= 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
ri->quorum = ll;
|
|
changes++;
|
|
} else if (!strcasecmp(option,"rename-command") && moreargs > 1) {
|
|
/* rename-command <oldname> <newname> */
|
|
sds oldname = c->argv[++j]->ptr;
|
|
sds newname = c->argv[++j]->ptr;
|
|
|
|
if ((sdslen(oldname) == 0) || (sdslen(newname) == 0)) {
|
|
badarg = sdslen(newname) ? j-1 : j;
|
|
goto badfmt;
|
|
}
|
|
|
|
/* Remove any older renaming for this command. */
|
|
dictDelete(ri->renamed_commands,oldname);
|
|
|
|
/* If the target name is the same as the source name there
|
|
* is no need to add an entry mapping to itself. */
|
|
if (!dictSdsKeyCaseCompare(ri->renamed_commands,oldname,newname)) {
|
|
oldname = sdsdup(oldname);
|
|
newname = sdsdup(newname);
|
|
dictAdd(ri->renamed_commands,oldname,newname);
|
|
}
|
|
changes++;
|
|
} else if (!strcasecmp(option,"master-reboot-down-after-period") && moreargs > 0) {
|
|
/* master-reboot-down-after-period <milliseconds> */
|
|
robj *o = c->argv[++j];
|
|
if (getLongLongFromObject(o,&ll) == C_ERR || ll < 0) {
|
|
badarg = j;
|
|
goto badfmt;
|
|
}
|
|
ri->master_reboot_down_after_period = ll;
|
|
changes++;
|
|
} else {
|
|
addReplyErrorFormat(c,"Unknown option or number of arguments for "
|
|
"SENTINEL SET '%s'", option);
|
|
goto seterr;
|
|
}
|
|
|
|
/* Log the event. */
|
|
int numargs = j-old_j+1;
|
|
switch(numargs) {
|
|
case 2:
|
|
sentinelEvent(LL_WARNING,"+set",ri,"%@ %s %s",(char*)c->argv[old_j]->ptr,
|
|
redacted ? "******" : (char*)c->argv[old_j+1]->ptr);
|
|
break;
|
|
case 3:
|
|
sentinelEvent(LL_WARNING,"+set",ri,"%@ %s %s %s",(char*)c->argv[old_j]->ptr,
|
|
(char*)c->argv[old_j+1]->ptr,
|
|
(char*)c->argv[old_j+2]->ptr);
|
|
break;
|
|
default:
|
|
sentinelEvent(LL_WARNING,"+set",ri,"%@ %s",(char*)c->argv[old_j]->ptr);
|
|
break;
|
|
}
|
|
}
|
|
if (changes) sentinelFlushConfigAndReply(c);
|
|
return;
|
|
|
|
badfmt: /* Bad format errors */
|
|
addReplyErrorFormat(c,"Invalid argument '%s' for SENTINEL SET '%s'",
|
|
(char*)c->argv[badarg]->ptr,option);
|
|
seterr:
|
|
/* TODO: Handle the case of both bad input and save error, possibly handling
|
|
* SENTINEL SET atomically. */
|
|
if (changes) sentinelFlushConfig();
|
|
}
|
|
|
|
/* Our fake PUBLISH command: it is actually useful only to receive hello messages
|
|
* from the other sentinel instances, and publishing to a channel other than
|
|
* SENTINEL_HELLO_CHANNEL is forbidden.
|
|
*
|
|
* Because we have a Sentinel PUBLISH, the code to send hello messages is the same
|
|
* for all the three kind of instances: masters, slaves, sentinels. */
|
|
void sentinelPublishCommand(client *c) {
|
|
if (strcmp(c->argv[1]->ptr,SENTINEL_HELLO_CHANNEL)) {
|
|
addReplyError(c, "Only HELLO messages are accepted by Sentinel instances.");
|
|
return;
|
|
}
|
|
sentinelProcessHelloMessage(c->argv[2]->ptr,sdslen(c->argv[2]->ptr));
|
|
addReplyLongLong(c,1);
|
|
}
|
|
|
|
/* ===================== SENTINEL availability checks ======================= */
|
|
|
|
/* Is this instance down from our point of view? */
|
|
void sentinelCheckSubjectivelyDown(sentinelRedisInstance *ri) {
|
|
mstime_t elapsed = 0;
|
|
|
|
if (ri->link->act_ping_time)
|
|
elapsed = mstime() - ri->link->act_ping_time;
|
|
else if (ri->link->disconnected)
|
|
elapsed = mstime() - ri->link->last_avail_time;
|
|
|
|
/* Check if we are in need for a reconnection of one of the
|
|
* links, because we are detecting low activity.
|
|
*
|
|
* 1) Check if the command link seems connected, was connected not less
|
|
* than SENTINEL_MIN_LINK_RECONNECT_PERIOD, but still we have a
|
|
* pending ping for more than half the timeout. */
|
|
if (ri->link->cc &&
|
|
(mstime() - ri->link->cc_conn_time) >
|
|
sentinel_min_link_reconnect_period &&
|
|
ri->link->act_ping_time != 0 && /* There is a pending ping... */
|
|
/* The pending ping is delayed, and we did not receive
|
|
* error replies as well. */
|
|
(mstime() - ri->link->act_ping_time) > (ri->down_after_period/2) &&
|
|
(mstime() - ri->link->last_pong_time) > (ri->down_after_period/2))
|
|
{
|
|
instanceLinkCloseConnection(ri->link,ri->link->cc);
|
|
}
|
|
|
|
/* 2) Check if the pubsub link seems connected, was connected not less
|
|
* than SENTINEL_MIN_LINK_RECONNECT_PERIOD, but still we have no
|
|
* activity in the Pub/Sub channel for more than
|
|
* SENTINEL_PUBLISH_PERIOD * 3.
|
|
*/
|
|
if (ri->link->pc &&
|
|
(mstime() - ri->link->pc_conn_time) >
|
|
sentinel_min_link_reconnect_period &&
|
|
(mstime() - ri->link->pc_last_activity) > (sentinel_publish_period*3))
|
|
{
|
|
instanceLinkCloseConnection(ri->link,ri->link->pc);
|
|
}
|
|
|
|
/* Update the SDOWN flag. We believe the instance is SDOWN if:
|
|
*
|
|
* 1) It is not replying.
|
|
* 2) We believe it is a master, it reports to be a slave for enough time
|
|
* to meet the down_after_period, plus enough time to get two times
|
|
* INFO report from the instance. */
|
|
if (elapsed > ri->down_after_period ||
|
|
(ri->flags & SRI_MASTER &&
|
|
ri->role_reported == SRI_SLAVE &&
|
|
mstime() - ri->role_reported_time >
|
|
(ri->down_after_period+sentinel_info_period*2)) ||
|
|
(ri->flags & SRI_MASTER_REBOOT &&
|
|
mstime()-ri->master_reboot_since_time > ri->master_reboot_down_after_period))
|
|
{
|
|
/* Is subjectively down */
|
|
if ((ri->flags & SRI_S_DOWN) == 0) {
|
|
sentinelEvent(LL_WARNING,"+sdown",ri,"%@");
|
|
ri->s_down_since_time = mstime();
|
|
ri->flags |= SRI_S_DOWN;
|
|
}
|
|
} else {
|
|
/* Is subjectively up */
|
|
if (ri->flags & SRI_S_DOWN) {
|
|
sentinelEvent(LL_WARNING,"-sdown",ri,"%@");
|
|
ri->flags &= ~(SRI_S_DOWN|SRI_SCRIPT_KILL_SENT);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Is this instance down according to the configured quorum?
|
|
*
|
|
* Note that ODOWN is a weak quorum, it only means that enough Sentinels
|
|
* reported in a given time range that the instance was not reachable.
|
|
* However messages can be delayed so there are no strong guarantees about
|
|
* N instances agreeing at the same time about the down state. */
|
|
void sentinelCheckObjectivelyDown(sentinelRedisInstance *master) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
unsigned int quorum = 0, odown = 0;
|
|
|
|
if (master->flags & SRI_S_DOWN) {
|
|
/* Is down for enough sentinels? */
|
|
quorum = 1; /* the current sentinel. */
|
|
/* Count all the other sentinels. */
|
|
di = dictGetIterator(master->sentinels);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
|
|
if (ri->flags & SRI_MASTER_DOWN) quorum++;
|
|
}
|
|
dictReleaseIterator(di);
|
|
if (quorum >= master->quorum) odown = 1;
|
|
}
|
|
|
|
/* Set the flag accordingly to the outcome. */
|
|
if (odown) {
|
|
if ((master->flags & SRI_O_DOWN) == 0) {
|
|
sentinelEvent(LL_WARNING,"+odown",master,"%@ #quorum %d/%d",
|
|
quorum, master->quorum);
|
|
master->flags |= SRI_O_DOWN;
|
|
master->o_down_since_time = mstime();
|
|
}
|
|
} else {
|
|
if (master->flags & SRI_O_DOWN) {
|
|
sentinelEvent(LL_WARNING,"-odown",master,"%@");
|
|
master->flags &= ~SRI_O_DOWN;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Receive the SENTINEL is-master-down-by-addr reply, see the
|
|
* sentinelAskMasterStateToOtherSentinels() function for more information. */
|
|
void sentinelReceiveIsMasterDownReply(redisAsyncContext *c, void *reply, void *privdata) {
|
|
sentinelRedisInstance *ri = privdata;
|
|
instanceLink *link = c->data;
|
|
redisReply *r;
|
|
|
|
if (!reply || !link) return;
|
|
link->pending_commands--;
|
|
r = reply;
|
|
|
|
/* Ignore every error or unexpected reply.
|
|
* Note that if the command returns an error for any reason we'll
|
|
* end clearing the SRI_MASTER_DOWN flag for timeout anyway. */
|
|
if (r->type == REDIS_REPLY_ARRAY && r->elements == 3 &&
|
|
r->element[0]->type == REDIS_REPLY_INTEGER &&
|
|
r->element[1]->type == REDIS_REPLY_STRING &&
|
|
r->element[2]->type == REDIS_REPLY_INTEGER)
|
|
{
|
|
ri->last_master_down_reply_time = mstime();
|
|
if (r->element[0]->integer == 1) {
|
|
ri->flags |= SRI_MASTER_DOWN;
|
|
} else {
|
|
ri->flags &= ~SRI_MASTER_DOWN;
|
|
}
|
|
if (strcmp(r->element[1]->str,"*")) {
|
|
/* If the runid in the reply is not "*" the Sentinel actually
|
|
* replied with a vote. */
|
|
sdsfree(ri->leader);
|
|
if ((long long)ri->leader_epoch != r->element[2]->integer)
|
|
serverLog(LL_WARNING,
|
|
"%s voted for %s %llu", ri->name,
|
|
r->element[1]->str,
|
|
(unsigned long long) r->element[2]->integer);
|
|
ri->leader = sdsnew(r->element[1]->str);
|
|
ri->leader_epoch = r->element[2]->integer;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* If we think the master is down, we start sending
|
|
* SENTINEL IS-MASTER-DOWN-BY-ADDR requests to other sentinels
|
|
* in order to get the replies that allow to reach the quorum
|
|
* needed to mark the master in ODOWN state and trigger a failover. */
|
|
#define SENTINEL_ASK_FORCED (1<<0)
|
|
void sentinelAskMasterStateToOtherSentinels(sentinelRedisInstance *master, int flags) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
|
|
di = dictGetIterator(master->sentinels);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
mstime_t elapsed = mstime() - ri->last_master_down_reply_time;
|
|
char port[32];
|
|
int retval;
|
|
|
|
/* If the master state from other sentinel is too old, we clear it. */
|
|
if (elapsed > sentinel_ask_period*5) {
|
|
ri->flags &= ~SRI_MASTER_DOWN;
|
|
sdsfree(ri->leader);
|
|
ri->leader = NULL;
|
|
}
|
|
|
|
/* Only ask if master is down to other sentinels if:
|
|
*
|
|
* 1) We believe it is down, or there is a failover in progress.
|
|
* 2) Sentinel is connected.
|
|
* 3) We did not receive the info within SENTINEL_ASK_PERIOD ms. */
|
|
if ((master->flags & SRI_S_DOWN) == 0) continue;
|
|
if (ri->link->disconnected) continue;
|
|
if (!(flags & SENTINEL_ASK_FORCED) &&
|
|
mstime() - ri->last_master_down_reply_time < sentinel_ask_period)
|
|
continue;
|
|
|
|
/* Ask */
|
|
ll2string(port,sizeof(port),master->addr->port);
|
|
retval = redisAsyncCommand(ri->link->cc,
|
|
sentinelReceiveIsMasterDownReply, ri,
|
|
"%s is-master-down-by-addr %s %s %llu %s",
|
|
sentinelInstanceMapCommand(ri,"SENTINEL"),
|
|
announceSentinelAddr(master->addr), port,
|
|
sentinel.current_epoch,
|
|
(master->failover_state > SENTINEL_FAILOVER_STATE_NONE) ?
|
|
sentinel.myid : "*");
|
|
if (retval == C_OK) ri->link->pending_commands++;
|
|
}
|
|
dictReleaseIterator(di);
|
|
}
|
|
|
|
/* =============================== FAILOVER ================================= */
|
|
|
|
/* Crash because of user request via SENTINEL simulate-failure command. */
|
|
void sentinelSimFailureCrash(void) {
|
|
serverLog(LL_WARNING,
|
|
"Sentinel CRASH because of SENTINEL simulate-failure");
|
|
exit(99);
|
|
}
|
|
|
|
/* Vote for the sentinel with 'req_runid' or return the old vote if already
|
|
* voted for the specified 'req_epoch' or one greater.
|
|
*
|
|
* If a vote is not available returns NULL, otherwise return the Sentinel
|
|
* runid and populate the leader_epoch with the epoch of the vote. */
|
|
char *sentinelVoteLeader(sentinelRedisInstance *master, uint64_t req_epoch, char *req_runid, uint64_t *leader_epoch) {
|
|
if (req_epoch > sentinel.current_epoch) {
|
|
sentinel.current_epoch = req_epoch;
|
|
sentinelFlushConfig();
|
|
sentinelEvent(LL_WARNING,"+new-epoch",master,"%llu",
|
|
(unsigned long long) sentinel.current_epoch);
|
|
}
|
|
|
|
if (master->leader_epoch < req_epoch && sentinel.current_epoch <= req_epoch)
|
|
{
|
|
sdsfree(master->leader);
|
|
master->leader = sdsnew(req_runid);
|
|
master->leader_epoch = sentinel.current_epoch;
|
|
sentinelFlushConfig();
|
|
sentinelEvent(LL_WARNING,"+vote-for-leader",master,"%s %llu",
|
|
master->leader, (unsigned long long) master->leader_epoch);
|
|
/* If we did not voted for ourselves, set the master failover start
|
|
* time to now, in order to force a delay before we can start a
|
|
* failover for the same master. */
|
|
if (strcasecmp(master->leader,sentinel.myid))
|
|
master->failover_start_time = mstime()+rand()%SENTINEL_MAX_DESYNC;
|
|
}
|
|
|
|
*leader_epoch = master->leader_epoch;
|
|
return master->leader ? sdsnew(master->leader) : NULL;
|
|
}
|
|
|
|
struct sentinelLeader {
|
|
char *runid;
|
|
unsigned long votes;
|
|
};
|
|
|
|
/* Helper function for sentinelGetLeader, increment the counter
|
|
* relative to the specified runid. */
|
|
int sentinelLeaderIncr(dict *counters, char *runid) {
|
|
dictEntry *existing, *de;
|
|
uint64_t oldval;
|
|
|
|
de = dictAddRaw(counters,runid,&existing);
|
|
if (existing) {
|
|
oldval = dictGetUnsignedIntegerVal(existing);
|
|
dictSetUnsignedIntegerVal(existing,oldval+1);
|
|
return oldval+1;
|
|
} else {
|
|
serverAssert(de != NULL);
|
|
dictSetUnsignedIntegerVal(de,1);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/* Scan all the Sentinels attached to this master to check if there
|
|
* is a leader for the specified epoch.
|
|
*
|
|
* To be a leader for a given epoch, we should have the majority of
|
|
* the Sentinels we know (ever seen since the last SENTINEL RESET) that
|
|
* reported the same instance as leader for the same epoch. */
|
|
char *sentinelGetLeader(sentinelRedisInstance *master, uint64_t epoch) {
|
|
dict *counters;
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
unsigned int voters = 0, voters_quorum;
|
|
char *myvote;
|
|
char *winner = NULL;
|
|
uint64_t leader_epoch;
|
|
uint64_t max_votes = 0;
|
|
|
|
serverAssert(master->flags & (SRI_O_DOWN|SRI_FAILOVER_IN_PROGRESS));
|
|
counters = dictCreate(&leaderVotesDictType);
|
|
|
|
voters = dictSize(master->sentinels)+1; /* All the other sentinels and me.*/
|
|
|
|
/* Count other sentinels votes */
|
|
di = dictGetIterator(master->sentinels);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
if (ri->leader != NULL && ri->leader_epoch == sentinel.current_epoch)
|
|
sentinelLeaderIncr(counters,ri->leader);
|
|
}
|
|
dictReleaseIterator(di);
|
|
|
|
/* Check what's the winner. For the winner to win, it needs two conditions:
|
|
* 1) Absolute majority between voters (50% + 1).
|
|
* 2) And anyway at least master->quorum votes. */
|
|
di = dictGetIterator(counters);
|
|
while((de = dictNext(di)) != NULL) {
|
|
uint64_t votes = dictGetUnsignedIntegerVal(de);
|
|
|
|
if (votes > max_votes) {
|
|
max_votes = votes;
|
|
winner = dictGetKey(de);
|
|
}
|
|
}
|
|
dictReleaseIterator(di);
|
|
|
|
/* Count this Sentinel vote:
|
|
* if this Sentinel did not voted yet, either vote for the most
|
|
* common voted sentinel, or for itself if no vote exists at all. */
|
|
if (winner)
|
|
myvote = sentinelVoteLeader(master,epoch,winner,&leader_epoch);
|
|
else
|
|
myvote = sentinelVoteLeader(master,epoch,sentinel.myid,&leader_epoch);
|
|
|
|
if (myvote && leader_epoch == epoch) {
|
|
uint64_t votes = sentinelLeaderIncr(counters,myvote);
|
|
|
|
if (votes > max_votes) {
|
|
max_votes = votes;
|
|
winner = myvote;
|
|
}
|
|
}
|
|
|
|
voters_quorum = voters/2+1;
|
|
if (winner && (max_votes < voters_quorum || max_votes < master->quorum))
|
|
winner = NULL;
|
|
|
|
winner = winner ? sdsnew(winner) : NULL;
|
|
sdsfree(myvote);
|
|
dictRelease(counters);
|
|
return winner;
|
|
}
|
|
|
|
/* Send SLAVEOF to the specified instance, always followed by a
|
|
* CONFIG REWRITE command in order to store the new configuration on disk
|
|
* when possible (that is, if the Redis instance is recent enough to support
|
|
* config rewriting, and if the server was started with a configuration file).
|
|
*
|
|
* If Host is NULL the function sends "SLAVEOF NO ONE".
|
|
*
|
|
* The command returns C_OK if the SLAVEOF command was accepted for
|
|
* (later) delivery otherwise C_ERR. The command replies are just
|
|
* discarded. */
|
|
int sentinelSendSlaveOf(sentinelRedisInstance *ri, const sentinelAddr *addr) {
|
|
char portstr[32];
|
|
const char *host;
|
|
int retval;
|
|
|
|
/* If host is NULL we send SLAVEOF NO ONE that will turn the instance
|
|
* into a master. */
|
|
if (!addr) {
|
|
host = "NO";
|
|
memcpy(portstr,"ONE",4);
|
|
} else {
|
|
host = announceSentinelAddr(addr);
|
|
ll2string(portstr,sizeof(portstr),addr->port);
|
|
}
|
|
|
|
/* In order to send SLAVEOF in a safe way, we send a transaction performing
|
|
* the following tasks:
|
|
* 1) Reconfigure the instance according to the specified host/port params.
|
|
* 2) Rewrite the configuration.
|
|
* 3) Disconnect all clients (but this one sending the command) in order
|
|
* to trigger the ask-master-on-reconnection protocol for connected
|
|
* clients.
|
|
*
|
|
* Note that we don't check the replies returned by commands, since we
|
|
* will observe instead the effects in the next INFO output. */
|
|
retval = redisAsyncCommand(ri->link->cc,
|
|
sentinelDiscardReplyCallback, ri, "%s",
|
|
sentinelInstanceMapCommand(ri,"MULTI"));
|
|
if (retval == C_ERR) return retval;
|
|
ri->link->pending_commands++;
|
|
|
|
retval = redisAsyncCommand(ri->link->cc,
|
|
sentinelDiscardReplyCallback, ri, "%s %s %s",
|
|
sentinelInstanceMapCommand(ri,"SLAVEOF"),
|
|
host, portstr);
|
|
if (retval == C_ERR) return retval;
|
|
ri->link->pending_commands++;
|
|
|
|
retval = redisAsyncCommand(ri->link->cc,
|
|
sentinelDiscardReplyCallback, ri, "%s REWRITE",
|
|
sentinelInstanceMapCommand(ri,"CONFIG"));
|
|
if (retval == C_ERR) return retval;
|
|
ri->link->pending_commands++;
|
|
|
|
/* CLIENT KILL TYPE <type> is only supported starting from Redis 2.8.12,
|
|
* however sending it to an instance not understanding this command is not
|
|
* an issue because CLIENT is variadic command, so Redis will not
|
|
* recognized as a syntax error, and the transaction will not fail (but
|
|
* only the unsupported command will fail). */
|
|
for (int type = 0; type < 2; type++) {
|
|
retval = redisAsyncCommand(ri->link->cc,
|
|
sentinelDiscardReplyCallback, ri, "%s KILL TYPE %s",
|
|
sentinelInstanceMapCommand(ri,"CLIENT"),
|
|
type == 0 ? "normal" : "pubsub");
|
|
if (retval == C_ERR) return retval;
|
|
ri->link->pending_commands++;
|
|
}
|
|
|
|
retval = redisAsyncCommand(ri->link->cc,
|
|
sentinelDiscardReplyCallback, ri, "%s",
|
|
sentinelInstanceMapCommand(ri,"EXEC"));
|
|
if (retval == C_ERR) return retval;
|
|
ri->link->pending_commands++;
|
|
|
|
return C_OK;
|
|
}
|
|
|
|
/* Setup the master state to start a failover. */
|
|
void sentinelStartFailover(sentinelRedisInstance *master) {
|
|
serverAssert(master->flags & SRI_MASTER);
|
|
|
|
master->failover_state = SENTINEL_FAILOVER_STATE_WAIT_START;
|
|
master->flags |= SRI_FAILOVER_IN_PROGRESS;
|
|
master->failover_epoch = ++sentinel.current_epoch;
|
|
sentinelEvent(LL_WARNING,"+new-epoch",master,"%llu",
|
|
(unsigned long long) sentinel.current_epoch);
|
|
sentinelEvent(LL_WARNING,"+try-failover",master,"%@");
|
|
master->failover_start_time = mstime()+rand()%SENTINEL_MAX_DESYNC;
|
|
master->failover_state_change_time = mstime();
|
|
}
|
|
|
|
/* This function checks if there are the conditions to start the failover,
|
|
* that is:
|
|
*
|
|
* 1) Master must be in ODOWN condition.
|
|
* 2) No failover already in progress.
|
|
* 3) No failover already attempted recently.
|
|
*
|
|
* We still don't know if we'll win the election so it is possible that we
|
|
* start the failover but that we'll not be able to act.
|
|
*
|
|
* Return non-zero if a failover was started. */
|
|
int sentinelStartFailoverIfNeeded(sentinelRedisInstance *master) {
|
|
/* We can't failover if the master is not in O_DOWN state. */
|
|
if (!(master->flags & SRI_O_DOWN)) return 0;
|
|
|
|
/* Failover already in progress? */
|
|
if (master->flags & SRI_FAILOVER_IN_PROGRESS) return 0;
|
|
|
|
/* Last failover attempt started too little time ago? */
|
|
if (mstime() - master->failover_start_time <
|
|
master->failover_timeout*2)
|
|
{
|
|
if (master->failover_delay_logged != master->failover_start_time) {
|
|
time_t clock = (master->failover_start_time +
|
|
master->failover_timeout*2) / 1000;
|
|
char ctimebuf[26];
|
|
|
|
ctime_r(&clock,ctimebuf);
|
|
ctimebuf[24] = '\0'; /* Remove newline. */
|
|
master->failover_delay_logged = master->failover_start_time;
|
|
serverLog(LL_WARNING,
|
|
"Next failover delay: I will not start a failover before %s",
|
|
ctimebuf);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
sentinelStartFailover(master);
|
|
return 1;
|
|
}
|
|
|
|
/* Select a suitable slave to promote. The current algorithm only uses
|
|
* the following parameters:
|
|
*
|
|
* 1) None of the following conditions: S_DOWN, O_DOWN, DISCONNECTED.
|
|
* 2) Last time the slave replied to ping no more than 5 times the PING period.
|
|
* 3) info_refresh not older than 3 times the INFO refresh period.
|
|
* 4) master_link_down_time no more than:
|
|
* (now - master->s_down_since_time) + (master->down_after_period * 10).
|
|
* Basically since the master is down from our POV, the slave reports
|
|
* to be disconnected no more than 10 times the configured down-after-period.
|
|
* This is pretty much black magic but the idea is, the master was not
|
|
* available so the slave may be lagging, but not over a certain time.
|
|
* Anyway we'll select the best slave according to replication offset.
|
|
* 5) Slave priority can't be zero, otherwise the slave is discarded.
|
|
*
|
|
* Among all the slaves matching the above conditions we select the slave
|
|
* with, in order of sorting key:
|
|
*
|
|
* - lower slave_priority.
|
|
* - bigger processed replication offset.
|
|
* - lexicographically smaller runid.
|
|
*
|
|
* Basically if runid is the same, the slave that processed more commands
|
|
* from the master is selected.
|
|
*
|
|
* The function returns the pointer to the selected slave, otherwise
|
|
* NULL if no suitable slave was found.
|
|
*/
|
|
|
|
/* Helper for sentinelSelectSlave(). This is used by qsort() in order to
|
|
* sort suitable slaves in a "better first" order, to take the first of
|
|
* the list. */
|
|
int compareSlavesForPromotion(const void *a, const void *b) {
|
|
sentinelRedisInstance **sa = (sentinelRedisInstance **)a,
|
|
**sb = (sentinelRedisInstance **)b;
|
|
char *sa_runid, *sb_runid;
|
|
|
|
if ((*sa)->slave_priority != (*sb)->slave_priority)
|
|
return (*sa)->slave_priority - (*sb)->slave_priority;
|
|
|
|
/* If priority is the same, select the slave with greater replication
|
|
* offset (processed more data from the master). */
|
|
if ((*sa)->slave_repl_offset > (*sb)->slave_repl_offset) {
|
|
return -1; /* a < b */
|
|
} else if ((*sa)->slave_repl_offset < (*sb)->slave_repl_offset) {
|
|
return 1; /* a > b */
|
|
}
|
|
|
|
/* If the replication offset is the same select the slave with that has
|
|
* the lexicographically smaller runid. Note that we try to handle runid
|
|
* == NULL as there are old Redis versions that don't publish runid in
|
|
* INFO. A NULL runid is considered bigger than any other runid. */
|
|
sa_runid = (*sa)->runid;
|
|
sb_runid = (*sb)->runid;
|
|
if (sa_runid == NULL && sb_runid == NULL) return 0;
|
|
else if (sa_runid == NULL) return 1; /* a > b */
|
|
else if (sb_runid == NULL) return -1; /* a < b */
|
|
return strcasecmp(sa_runid, sb_runid);
|
|
}
|
|
|
|
sentinelRedisInstance *sentinelSelectSlave(sentinelRedisInstance *master) {
|
|
sentinelRedisInstance **instance =
|
|
zmalloc(sizeof(instance[0])*dictSize(master->slaves));
|
|
sentinelRedisInstance *selected = NULL;
|
|
int instances = 0;
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
mstime_t max_master_down_time = 0;
|
|
|
|
if (master->flags & SRI_S_DOWN)
|
|
max_master_down_time += mstime() - master->s_down_since_time;
|
|
max_master_down_time += master->down_after_period * 10;
|
|
|
|
di = dictGetIterator(master->slaves);
|
|
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *slave = dictGetVal(de);
|
|
mstime_t info_validity_time;
|
|
|
|
if (slave->flags & (SRI_S_DOWN|SRI_O_DOWN)) continue;
|
|
if (slave->link->disconnected) continue;
|
|
if (mstime() - slave->link->last_avail_time > sentinel_ping_period*5) continue;
|
|
if (slave->slave_priority == 0) continue;
|
|
|
|
/* If the master is in SDOWN state we get INFO for slaves every second.
|
|
* Otherwise we get it with the usual period so we need to account for
|
|
* a larger delay. */
|
|
if (master->flags & SRI_S_DOWN)
|
|
info_validity_time = sentinel_ping_period*5;
|
|
else
|
|
info_validity_time = sentinel_info_period*3;
|
|
if (mstime() - slave->info_refresh > info_validity_time) continue;
|
|
if (slave->master_link_down_time > max_master_down_time) continue;
|
|
instance[instances++] = slave;
|
|
}
|
|
dictReleaseIterator(di);
|
|
if (instances) {
|
|
qsort(instance,instances,sizeof(sentinelRedisInstance*),
|
|
compareSlavesForPromotion);
|
|
selected = instance[0];
|
|
}
|
|
zfree(instance);
|
|
return selected;
|
|
}
|
|
|
|
/* ---------------- Failover state machine implementation ------------------- */
|
|
void sentinelFailoverWaitStart(sentinelRedisInstance *ri) {
|
|
char *leader;
|
|
int isleader;
|
|
|
|
/* Check if we are the leader for the failover epoch. */
|
|
leader = sentinelGetLeader(ri, ri->failover_epoch);
|
|
isleader = leader && strcasecmp(leader,sentinel.myid) == 0;
|
|
sdsfree(leader);
|
|
|
|
/* If I'm not the leader, and it is not a forced failover via
|
|
* SENTINEL FAILOVER, then I can't continue with the failover. */
|
|
if (!isleader && !(ri->flags & SRI_FORCE_FAILOVER)) {
|
|
mstime_t election_timeout = sentinel_election_timeout;
|
|
|
|
/* The election timeout is the MIN between SENTINEL_ELECTION_TIMEOUT
|
|
* and the configured failover timeout. */
|
|
if (election_timeout > ri->failover_timeout)
|
|
election_timeout = ri->failover_timeout;
|
|
/* Abort the failover if I'm not the leader after some time. */
|
|
if (mstime() - ri->failover_start_time > election_timeout) {
|
|
sentinelEvent(LL_WARNING,"-failover-abort-not-elected",ri,"%@");
|
|
sentinelAbortFailover(ri);
|
|
}
|
|
return;
|
|
}
|
|
sentinelEvent(LL_WARNING,"+elected-leader",ri,"%@");
|
|
if (sentinel.simfailure_flags & SENTINEL_SIMFAILURE_CRASH_AFTER_ELECTION)
|
|
sentinelSimFailureCrash();
|
|
ri->failover_state = SENTINEL_FAILOVER_STATE_SELECT_SLAVE;
|
|
ri->failover_state_change_time = mstime();
|
|
sentinelEvent(LL_WARNING,"+failover-state-select-slave",ri,"%@");
|
|
}
|
|
|
|
void sentinelFailoverSelectSlave(sentinelRedisInstance *ri) {
|
|
sentinelRedisInstance *slave = sentinelSelectSlave(ri);
|
|
|
|
/* We don't handle the timeout in this state as the function aborts
|
|
* the failover or go forward in the next state. */
|
|
if (slave == NULL) {
|
|
sentinelEvent(LL_WARNING,"-failover-abort-no-good-slave",ri,"%@");
|
|
sentinelAbortFailover(ri);
|
|
} else {
|
|
sentinelEvent(LL_WARNING,"+selected-slave",slave,"%@");
|
|
slave->flags |= SRI_PROMOTED;
|
|
ri->promoted_slave = slave;
|
|
ri->failover_state = SENTINEL_FAILOVER_STATE_SEND_SLAVEOF_NOONE;
|
|
ri->failover_state_change_time = mstime();
|
|
sentinelEvent(LL_NOTICE,"+failover-state-send-slaveof-noone",
|
|
slave, "%@");
|
|
}
|
|
}
|
|
|
|
void sentinelFailoverSendSlaveOfNoOne(sentinelRedisInstance *ri) {
|
|
int retval;
|
|
|
|
/* We can't send the command to the promoted slave if it is now
|
|
* disconnected. Retry again and again with this state until the timeout
|
|
* is reached, then abort the failover. */
|
|
if (ri->promoted_slave->link->disconnected) {
|
|
if (mstime() - ri->failover_state_change_time > ri->failover_timeout) {
|
|
sentinelEvent(LL_WARNING,"-failover-abort-slave-timeout",ri,"%@");
|
|
sentinelAbortFailover(ri);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* Send SLAVEOF NO ONE command to turn the slave into a master.
|
|
* We actually register a generic callback for this command as we don't
|
|
* really care about the reply. We check if it worked indirectly observing
|
|
* if INFO returns a different role (master instead of slave). */
|
|
retval = sentinelSendSlaveOf(ri->promoted_slave,NULL);
|
|
if (retval != C_OK) return;
|
|
sentinelEvent(LL_NOTICE, "+failover-state-wait-promotion",
|
|
ri->promoted_slave,"%@");
|
|
ri->failover_state = SENTINEL_FAILOVER_STATE_WAIT_PROMOTION;
|
|
ri->failover_state_change_time = mstime();
|
|
}
|
|
|
|
/* We actually wait for promotion indirectly checking with INFO when the
|
|
* slave turns into a master. */
|
|
void sentinelFailoverWaitPromotion(sentinelRedisInstance *ri) {
|
|
/* Just handle the timeout. Switching to the next state is handled
|
|
* by the function parsing the INFO command of the promoted slave. */
|
|
if (mstime() - ri->failover_state_change_time > ri->failover_timeout) {
|
|
sentinelEvent(LL_WARNING,"-failover-abort-slave-timeout",ri,"%@");
|
|
sentinelAbortFailover(ri);
|
|
}
|
|
}
|
|
|
|
void sentinelFailoverDetectEnd(sentinelRedisInstance *master) {
|
|
int not_reconfigured = 0, timeout = 0;
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
mstime_t elapsed = mstime() - master->failover_state_change_time;
|
|
|
|
/* We can't consider failover finished if the promoted slave is
|
|
* not reachable. */
|
|
if (master->promoted_slave == NULL ||
|
|
master->promoted_slave->flags & SRI_S_DOWN) return;
|
|
|
|
/* The failover terminates once all the reachable slaves are properly
|
|
* configured. */
|
|
di = dictGetIterator(master->slaves);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *slave = dictGetVal(de);
|
|
|
|
if (slave->flags & (SRI_PROMOTED|SRI_RECONF_DONE)) continue;
|
|
if (slave->flags & SRI_S_DOWN) continue;
|
|
not_reconfigured++;
|
|
}
|
|
dictReleaseIterator(di);
|
|
|
|
/* Force end of failover on timeout. */
|
|
if (elapsed > master->failover_timeout) {
|
|
not_reconfigured = 0;
|
|
timeout = 1;
|
|
sentinelEvent(LL_WARNING,"+failover-end-for-timeout",master,"%@");
|
|
}
|
|
|
|
if (not_reconfigured == 0) {
|
|
sentinelEvent(LL_WARNING,"+failover-end",master,"%@");
|
|
master->failover_state = SENTINEL_FAILOVER_STATE_UPDATE_CONFIG;
|
|
master->failover_state_change_time = mstime();
|
|
}
|
|
|
|
/* If I'm the leader it is a good idea to send a best effort SLAVEOF
|
|
* command to all the slaves still not reconfigured to replicate with
|
|
* the new master. */
|
|
if (timeout) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
|
|
di = dictGetIterator(master->slaves);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *slave = dictGetVal(de);
|
|
int retval;
|
|
|
|
if (slave->flags & (SRI_PROMOTED|SRI_RECONF_DONE|SRI_RECONF_SENT)) continue;
|
|
if (slave->link->disconnected) continue;
|
|
|
|
retval = sentinelSendSlaveOf(slave,master->promoted_slave->addr);
|
|
if (retval == C_OK) {
|
|
sentinelEvent(LL_NOTICE,"+slave-reconf-sent-be",slave,"%@");
|
|
slave->flags |= SRI_RECONF_SENT;
|
|
}
|
|
}
|
|
dictReleaseIterator(di);
|
|
}
|
|
}
|
|
|
|
/* Send SLAVE OF <new master address> to all the remaining slaves that
|
|
* still don't appear to have the configuration updated. */
|
|
void sentinelFailoverReconfNextSlave(sentinelRedisInstance *master) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
int in_progress = 0;
|
|
|
|
di = dictGetIterator(master->slaves);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *slave = dictGetVal(de);
|
|
|
|
if (slave->flags & (SRI_RECONF_SENT|SRI_RECONF_INPROG))
|
|
in_progress++;
|
|
}
|
|
dictReleaseIterator(di);
|
|
|
|
di = dictGetIterator(master->slaves);
|
|
while(in_progress < master->parallel_syncs &&
|
|
(de = dictNext(di)) != NULL)
|
|
{
|
|
sentinelRedisInstance *slave = dictGetVal(de);
|
|
int retval;
|
|
|
|
/* Skip the promoted slave, and already configured slaves. */
|
|
if (slave->flags & (SRI_PROMOTED|SRI_RECONF_DONE)) continue;
|
|
|
|
/* If too much time elapsed without the slave moving forward to
|
|
* the next state, consider it reconfigured even if it is not.
|
|
* Sentinels will detect the slave as misconfigured and fix its
|
|
* configuration later. */
|
|
if ((slave->flags & SRI_RECONF_SENT) &&
|
|
(mstime() - slave->slave_reconf_sent_time) >
|
|
sentinel_slave_reconf_timeout)
|
|
{
|
|
sentinelEvent(LL_NOTICE,"-slave-reconf-sent-timeout",slave,"%@");
|
|
slave->flags &= ~SRI_RECONF_SENT;
|
|
slave->flags |= SRI_RECONF_DONE;
|
|
}
|
|
|
|
/* Nothing to do for instances that are disconnected or already
|
|
* in RECONF_SENT state. */
|
|
if (slave->flags & (SRI_RECONF_SENT|SRI_RECONF_INPROG)) continue;
|
|
if (slave->link->disconnected) continue;
|
|
|
|
/* Send SLAVEOF <new master>. */
|
|
retval = sentinelSendSlaveOf(slave,master->promoted_slave->addr);
|
|
if (retval == C_OK) {
|
|
slave->flags |= SRI_RECONF_SENT;
|
|
slave->slave_reconf_sent_time = mstime();
|
|
sentinelEvent(LL_NOTICE,"+slave-reconf-sent",slave,"%@");
|
|
in_progress++;
|
|
}
|
|
}
|
|
dictReleaseIterator(di);
|
|
|
|
/* Check if all the slaves are reconfigured and handle timeout. */
|
|
sentinelFailoverDetectEnd(master);
|
|
}
|
|
|
|
/* This function is called when the slave is in
|
|
* SENTINEL_FAILOVER_STATE_UPDATE_CONFIG state. In this state we need
|
|
* to remove it from the master table and add the promoted slave instead. */
|
|
void sentinelFailoverSwitchToPromotedSlave(sentinelRedisInstance *master) {
|
|
sentinelRedisInstance *ref = master->promoted_slave ?
|
|
master->promoted_slave : master;
|
|
|
|
sentinelEvent(LL_WARNING,"+switch-master",master,"%s %s %d %s %d",
|
|
master->name, announceSentinelAddr(master->addr), master->addr->port,
|
|
announceSentinelAddr(ref->addr), ref->addr->port);
|
|
|
|
sentinelResetMasterAndChangeAddress(master,ref->addr->hostname,ref->addr->port);
|
|
}
|
|
|
|
void sentinelFailoverStateMachine(sentinelRedisInstance *ri) {
|
|
serverAssert(ri->flags & SRI_MASTER);
|
|
|
|
if (!(ri->flags & SRI_FAILOVER_IN_PROGRESS)) return;
|
|
|
|
switch(ri->failover_state) {
|
|
case SENTINEL_FAILOVER_STATE_WAIT_START:
|
|
sentinelFailoverWaitStart(ri);
|
|
break;
|
|
case SENTINEL_FAILOVER_STATE_SELECT_SLAVE:
|
|
sentinelFailoverSelectSlave(ri);
|
|
break;
|
|
case SENTINEL_FAILOVER_STATE_SEND_SLAVEOF_NOONE:
|
|
sentinelFailoverSendSlaveOfNoOne(ri);
|
|
break;
|
|
case SENTINEL_FAILOVER_STATE_WAIT_PROMOTION:
|
|
sentinelFailoverWaitPromotion(ri);
|
|
break;
|
|
case SENTINEL_FAILOVER_STATE_RECONF_SLAVES:
|
|
sentinelFailoverReconfNextSlave(ri);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Abort a failover in progress:
|
|
*
|
|
* This function can only be called before the promoted slave acknowledged
|
|
* the slave -> master switch. Otherwise the failover can't be aborted and
|
|
* will reach its end (possibly by timeout). */
|
|
void sentinelAbortFailover(sentinelRedisInstance *ri) {
|
|
serverAssert(ri->flags & SRI_FAILOVER_IN_PROGRESS);
|
|
serverAssert(ri->failover_state <= SENTINEL_FAILOVER_STATE_WAIT_PROMOTION);
|
|
|
|
ri->flags &= ~(SRI_FAILOVER_IN_PROGRESS|SRI_FORCE_FAILOVER);
|
|
ri->failover_state = SENTINEL_FAILOVER_STATE_NONE;
|
|
ri->failover_state_change_time = mstime();
|
|
if (ri->promoted_slave) {
|
|
ri->promoted_slave->flags &= ~SRI_PROMOTED;
|
|
ri->promoted_slave = NULL;
|
|
}
|
|
}
|
|
|
|
/* ======================== SENTINEL timer handler ==========================
|
|
* This is the "main" our Sentinel, being sentinel completely non blocking
|
|
* in design.
|
|
* -------------------------------------------------------------------------- */
|
|
|
|
/* Perform scheduled operations for the specified Redis instance. */
|
|
void sentinelHandleRedisInstance(sentinelRedisInstance *ri) {
|
|
/* ========== MONITORING HALF ============ */
|
|
/* Every kind of instance */
|
|
sentinelReconnectInstance(ri);
|
|
sentinelSendPeriodicCommands(ri);
|
|
|
|
/* ============== ACTING HALF ============= */
|
|
/* We don't proceed with the acting half if we are in TILT mode.
|
|
* TILT happens when we find something odd with the time, like a
|
|
* sudden change in the clock. */
|
|
if (sentinel.tilt) {
|
|
if (mstime()-sentinel.tilt_start_time < sentinel_tilt_period) return;
|
|
sentinel.tilt = 0;
|
|
sentinelEvent(LL_WARNING,"-tilt",NULL,"#tilt mode exited");
|
|
}
|
|
|
|
/* Every kind of instance */
|
|
sentinelCheckSubjectivelyDown(ri);
|
|
|
|
/* Masters and slaves */
|
|
if (ri->flags & (SRI_MASTER|SRI_SLAVE)) {
|
|
/* Nothing so far. */
|
|
}
|
|
|
|
/* Only masters */
|
|
if (ri->flags & SRI_MASTER) {
|
|
sentinelCheckObjectivelyDown(ri);
|
|
if (sentinelStartFailoverIfNeeded(ri))
|
|
sentinelAskMasterStateToOtherSentinels(ri,SENTINEL_ASK_FORCED);
|
|
sentinelFailoverStateMachine(ri);
|
|
sentinelAskMasterStateToOtherSentinels(ri,SENTINEL_NO_FLAGS);
|
|
}
|
|
}
|
|
|
|
/* Perform scheduled operations for all the instances in the dictionary.
|
|
* Recursively call the function against dictionaries of slaves. */
|
|
void sentinelHandleDictOfRedisInstances(dict *instances) {
|
|
dictIterator *di;
|
|
dictEntry *de;
|
|
sentinelRedisInstance *switch_to_promoted = NULL;
|
|
|
|
/* There are a number of things we need to perform against every master. */
|
|
di = dictGetIterator(instances);
|
|
while((de = dictNext(di)) != NULL) {
|
|
sentinelRedisInstance *ri = dictGetVal(de);
|
|
|
|
sentinelHandleRedisInstance(ri);
|
|
if (ri->flags & SRI_MASTER) {
|
|
sentinelHandleDictOfRedisInstances(ri->slaves);
|
|
sentinelHandleDictOfRedisInstances(ri->sentinels);
|
|
if (ri->failover_state == SENTINEL_FAILOVER_STATE_UPDATE_CONFIG) {
|
|
switch_to_promoted = ri;
|
|
}
|
|
}
|
|
}
|
|
if (switch_to_promoted)
|
|
sentinelFailoverSwitchToPromotedSlave(switch_to_promoted);
|
|
dictReleaseIterator(di);
|
|
}
|
|
|
|
/* This function checks if we need to enter the TILT mode.
|
|
*
|
|
* The TILT mode is entered if we detect that between two invocations of the
|
|
* timer interrupt, a negative amount of time, or too much time has passed.
|
|
* Note that we expect that more or less just 100 milliseconds will pass
|
|
* if everything is fine. However we'll see a negative number or a
|
|
* difference bigger than SENTINEL_TILT_TRIGGER milliseconds if one of the
|
|
* following conditions happen:
|
|
*
|
|
* 1) The Sentinel process for some time is blocked, for every kind of
|
|
* random reason: the load is huge, the computer was frozen for some time
|
|
* in I/O or alike, the process was stopped by a signal. Everything.
|
|
* 2) The system clock was altered significantly.
|
|
*
|
|
* Under both this conditions we'll see everything as timed out and failing
|
|
* without good reasons. Instead we enter the TILT mode and wait
|
|
* for SENTINEL_TILT_PERIOD to elapse before starting to act again.
|
|
*
|
|
* During TILT time we still collect information, we just do not act. */
|
|
void sentinelCheckTiltCondition(void) {
|
|
mstime_t now = mstime();
|
|
mstime_t delta = now - sentinel.previous_time;
|
|
|
|
if (delta < 0 || delta > sentinel_tilt_trigger) {
|
|
sentinel.tilt = 1;
|
|
sentinel.tilt_start_time = mstime();
|
|
sentinelEvent(LL_WARNING,"+tilt",NULL,"#tilt mode entered");
|
|
}
|
|
sentinel.previous_time = mstime();
|
|
}
|
|
|
|
void sentinelTimer(void) {
|
|
sentinelCheckTiltCondition();
|
|
sentinelHandleDictOfRedisInstances(sentinel.masters);
|
|
sentinelRunPendingScripts();
|
|
sentinelCollectTerminatedScripts();
|
|
sentinelKillTimedoutScripts();
|
|
|
|
/* We continuously change the frequency of the Redis "timer interrupt"
|
|
* in order to desynchronize every Sentinel from every other.
|
|
* This non-determinism avoids that Sentinels started at the same time
|
|
* exactly continue to stay synchronized asking to be voted at the
|
|
* same time again and again (resulting in nobody likely winning the
|
|
* election because of split brain voting). */
|
|
server.hz = CONFIG_DEFAULT_HZ + rand() % CONFIG_DEFAULT_HZ;
|
|
}
|