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postgresql/contrib/pg_upgrade/pg_upgrade.c

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/*
* pg_upgrade.c
*
* main source file
*
* Copyright (c) 2010-2014, PostgreSQL Global Development Group
* contrib/pg_upgrade/pg_upgrade.c
*/
/*
* To simplify the upgrade process, we force certain system values to be
* identical between old and new clusters:
*
* We control all assignments of pg_class.oid (and relfilenode) so toast
* oids are the same between old and new clusters. This is important
* because toast oids are stored as toast pointers in user tables.
*
* While pg_class.oid and pg_class.relfilenode are initially the same
* in a cluster, they can diverge due to CLUSTER, REINDEX, or VACUUM
* FULL. In the new cluster, pg_class.oid and pg_class.relfilenode will
* be the same and will match the old pg_class.oid value. Because of
* this, old/new pg_class.relfilenode values will not match if CLUSTER,
* REINDEX, or VACUUM FULL have been performed in the old cluster.
*
* We control all assignments of pg_type.oid because these oids are stored
* in user composite type values.
*
* We control all assignments of pg_enum.oid because these oids are stored
* in user tables as enum values.
*
* We control all assignments of pg_authid.oid because these oids are stored
* in pg_largeobject_metadata.
*/
#include "postgres_fe.h"
#include "pg_upgrade.h"
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif
static void prepare_new_cluster(void);
static void prepare_new_databases(void);
static void create_new_objects(void);
static void copy_clog_xlog_xid(void);
static void set_frozenxids(bool minmxid_only);
static void setup(char *argv0, bool *live_check);
static void cleanup(void);
ClusterInfo old_cluster,
new_cluster;
OSInfo os_info;
char *output_files[] = {
SERVER_LOG_FILE,
#ifdef WIN32
/* unique file for pg_ctl start */
SERVER_START_LOG_FILE,
#endif
UTILITY_LOG_FILE,
INTERNAL_LOG_FILE,
NULL
};
int
main(int argc, char **argv)
{
char *analyze_script_file_name = NULL;
char *deletion_script_file_name = NULL;
bool live_check = false;
parseCommandLine(argc, argv);
adjust_data_dir(&old_cluster);
adjust_data_dir(&new_cluster);
setup(argv[0], &live_check);
output_check_banner(live_check);
check_cluster_versions();
get_sock_dir(&old_cluster, live_check);
get_sock_dir(&new_cluster, false);
check_cluster_compatibility(live_check);
check_and_dump_old_cluster(live_check);
/* -- NEW -- */
start_postmaster(&new_cluster, true);
check_new_cluster();
report_clusters_compatible();
pg_log(PG_REPORT, "\nPerforming Upgrade\n");
pg_log(PG_REPORT, "------------------\n");
prepare_new_cluster();
stop_postmaster(false);
/*
* Destructive Changes to New Cluster
*/
copy_clog_xlog_xid();
/* New now using xids of the old system */
/* -- NEW -- */
start_postmaster(&new_cluster, true);
prepare_new_databases();
create_new_objects();
stop_postmaster(false);
/*
* Most failures happen in create_new_objects(), which has completed at
* this point. We do this here because it is just before linking, which
* will link the old and new cluster data files, preventing the old
* cluster from being safely started once the new cluster is started.
*/
if (user_opts.transfer_mode == TRANSFER_MODE_LINK)
disable_old_cluster();
transfer_all_new_tablespaces(&old_cluster.dbarr, &new_cluster.dbarr,
old_cluster.pgdata, new_cluster.pgdata);
/*
* Assuming OIDs are only used in system tables, there is no need to
* restore the OID counter because we have not transferred any OIDs from
* the old system, but we do it anyway just in case. We do it late here
* because there is no need to have the schema load use new oids.
*/
prep_status("Setting next OID for new cluster");
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/pg_resetxlog\" -o %u \"%s\"",
new_cluster.bindir, old_cluster.controldata.chkpnt_nxtoid,
new_cluster.pgdata);
check_ok();
prep_status("Sync data directory to disk");
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/initdb\" --sync-only \"%s\"", new_cluster.bindir,
new_cluster.pgdata);
check_ok();
create_script_for_cluster_analyze(&analyze_script_file_name);
create_script_for_old_cluster_deletion(&deletion_script_file_name);
issue_warnings();
pg_log(PG_REPORT, "\nUpgrade Complete\n");
pg_log(PG_REPORT, "----------------\n");
output_completion_banner(analyze_script_file_name,
deletion_script_file_name);
pg_free(analyze_script_file_name);
pg_free(deletion_script_file_name);
cleanup();
return 0;
}
static void
setup(char *argv0, bool *live_check)
{
char exec_path[MAXPGPATH]; /* full path to my executable */
/*
* make sure the user has a clean environment, otherwise, we may confuse
* libpq when we connect to one (or both) of the servers.
*/
check_pghost_envvar();
verify_directories();
/* no postmasters should be running, except for a live check */
if (pid_lock_file_exists(old_cluster.pgdata))
{
/*
* If we have a postmaster.pid file, try to start the server. If it
* starts, the pid file was stale, so stop the server. If it doesn't
* start, assume the server is running. If the pid file is left over
* from a server crash, this also allows any committed transactions
* stored in the WAL to be replayed so they are not lost, because WAL
* files are not transfered from old to new servers.
*/
if (start_postmaster(&old_cluster, false))
stop_postmaster(false);
else
{
if (!user_opts.check)
pg_fatal("There seems to be a postmaster servicing the old cluster.\n"
"Please shutdown that postmaster and try again.\n");
else
*live_check = true;
}
}
/* same goes for the new postmaster */
if (pid_lock_file_exists(new_cluster.pgdata))
{
if (start_postmaster(&new_cluster, false))
stop_postmaster(false);
else
pg_fatal("There seems to be a postmaster servicing the new cluster.\n"
"Please shutdown that postmaster and try again.\n");
}
/* get path to pg_upgrade executable */
if (find_my_exec(argv0, exec_path) < 0)
pg_fatal("Could not get path name to pg_upgrade: %s\n", getErrorText(errno));
/* Trim off program name and keep just path */
*last_dir_separator(exec_path) = '\0';
canonicalize_path(exec_path);
os_info.exec_path = pg_strdup(exec_path);
}
static void
prepare_new_cluster(void)
{
/*
* It would make more sense to freeze after loading the schema, but that
* would cause us to lose the frozenids restored by the load. We use
* --analyze so autovacuum doesn't update statistics later
*/
prep_status("Analyzing all rows in the new cluster");
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/vacuumdb\" %s --all --analyze %s",
new_cluster.bindir, cluster_conn_opts(&new_cluster),
log_opts.verbose ? "--verbose" : "");
check_ok();
/*
* We do freeze after analyze so pg_statistic is also frozen. template0 is
* not frozen here, but data rows were frozen by initdb, and we set its
* datfrozenxid, relfrozenxids, and relminmxid later to match the new xid
* counter later.
*/
prep_status("Freezing all rows on the new cluster");
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/vacuumdb\" %s --all --freeze %s",
new_cluster.bindir, cluster_conn_opts(&new_cluster),
log_opts.verbose ? "--verbose" : "");
check_ok();
get_pg_database_relfilenode(&new_cluster);
}
static void
prepare_new_databases(void)
{
/*
* We set autovacuum_freeze_max_age to its maximum value so autovacuum
* does not launch here and delete clog files, before the frozen xids are
* set.
*/
set_frozenxids(false);
prep_status("Restoring global objects in the new cluster");
/*
* Install support functions in the global-object restore database to
* preserve pg_authid.oid. pg_dumpall uses 'template0' as its template
* database so objects we add into 'template1' are not propogated. They
* are removed on pg_upgrade exit.
*/
install_support_functions_in_new_db("template1");
/*
* We have to create the databases first so we can install support
* functions in all the other databases. Ideally we could create the
* support functions in template1 but pg_dumpall creates database using
* the template0 template.
*/
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/psql\" " EXEC_PSQL_ARGS " %s -f \"%s\"",
new_cluster.bindir, cluster_conn_opts(&new_cluster),
GLOBALS_DUMP_FILE);
check_ok();
/* we load this to get a current list of databases */
get_db_and_rel_infos(&new_cluster);
}
static void
create_new_objects(void)
{
int dbnum;
prep_status("Adding support functions to new cluster");
/*
* Technically, we only need to install these support functions in new
* databases that also exist in the old cluster, but for completeness we
* process all new databases.
*/
for (dbnum = 0; dbnum < new_cluster.dbarr.ndbs; dbnum++)
{
DbInfo *new_db = &new_cluster.dbarr.dbs[dbnum];
/* skip db we already installed */
if (strcmp(new_db->db_name, "template1") != 0)
install_support_functions_in_new_db(new_db->db_name);
}
check_ok();
prep_status("Restoring database schemas in the new cluster\n");
for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
{
char sql_file_name[MAXPGPATH],
log_file_name[MAXPGPATH];
DbInfo *old_db = &old_cluster.dbarr.dbs[dbnum];
pg_log(PG_STATUS, "%s", old_db->db_name);
snprintf(sql_file_name, sizeof(sql_file_name), DB_DUMP_FILE_MASK, old_db->db_oid);
snprintf(log_file_name, sizeof(log_file_name), DB_DUMP_LOG_FILE_MASK, old_db->db_oid);
/*
* pg_dump only produces its output at the end, so there is little
* parallelism if using the pipe.
*/
parallel_exec_prog(log_file_name,
NULL,
"\"%s/pg_restore\" %s --exit-on-error --verbose --dbname \"%s\" \"%s\"",
new_cluster.bindir,
cluster_conn_opts(&new_cluster),
old_db->db_name,
sql_file_name);
}
/* reap all children */
while (reap_child(true) == true)
;
end_progress_output();
check_ok();
/*
* We don't have minmxids for databases or relations in pre-9.3
* clusters, so set those after we have restores the schemas.
*/
if (GET_MAJOR_VERSION(old_cluster.major_version) < 903)
set_frozenxids(true);
optionally_create_toast_tables();
/* regenerate now that we have objects in the databases */
get_db_and_rel_infos(&new_cluster);
uninstall_support_functions_from_new_cluster();
}
/*
* Delete the given subdirectory contents from the new cluster
*/
static void
remove_new_subdir(char *subdir, bool rmtopdir)
{
char new_path[MAXPGPATH];
prep_status("Deleting files from new %s", subdir);
snprintf(new_path, sizeof(new_path), "%s/%s", new_cluster.pgdata, subdir);
if (!rmtree(new_path, rmtopdir))
pg_fatal("could not delete directory \"%s\"\n", new_path);
check_ok();
}
/*
* Copy the files from the old cluster into it
*/
static void
copy_subdir_files(char *subdir)
{
char old_path[MAXPGPATH];
char new_path[MAXPGPATH];
remove_new_subdir(subdir, true);
snprintf(old_path, sizeof(old_path), "%s/%s", old_cluster.pgdata, subdir);
snprintf(new_path, sizeof(new_path), "%s/%s", new_cluster.pgdata, subdir);
prep_status("Copying old %s to new server", subdir);
exec_prog(UTILITY_LOG_FILE, NULL, true,
#ifndef WIN32
"cp -Rf \"%s\" \"%s\"",
#else
/* flags: everything, no confirm, quiet, overwrite read-only */
"xcopy /e /y /q /r \"%s\" \"%s\\\"",
#endif
old_path, new_path);
check_ok();
}
static void
copy_clog_xlog_xid(void)
{
/* copy old commit logs to new data dir */
copy_subdir_files("pg_clog");
/* set the next transaction id and epoch of the new cluster */
prep_status("Setting next transaction ID and epoch for new cluster");
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/pg_resetxlog\" -f -x %u \"%s\"",
new_cluster.bindir, old_cluster.controldata.chkpnt_nxtxid,
new_cluster.pgdata);
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/pg_resetxlog\" -f -e %u \"%s\"",
new_cluster.bindir, old_cluster.controldata.chkpnt_nxtepoch,
new_cluster.pgdata);
/* must reset commit timestamp limits also */
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/pg_resetxlog\" -f -c %u,%u \"%s\"",
new_cluster.bindir,
old_cluster.controldata.chkpnt_nxtxid,
old_cluster.controldata.chkpnt_nxtxid,
new_cluster.pgdata);
check_ok();
/*
* If the old server is before the MULTIXACT_FORMATCHANGE_CAT_VER change
* (see pg_upgrade.h) and the new server is after, then we don't copy
* pg_multixact files, but we need to reset pg_control so that the new
* server doesn't attempt to read multis older than the cutoff value.
*/
if (old_cluster.controldata.cat_ver >= MULTIXACT_FORMATCHANGE_CAT_VER &&
new_cluster.controldata.cat_ver >= MULTIXACT_FORMATCHANGE_CAT_VER)
{
copy_subdir_files("pg_multixact/offsets");
copy_subdir_files("pg_multixact/members");
prep_status("Setting next multixact ID and offset for new cluster");
/*
* we preserve all files and contents, so we must preserve both "next"
* counters here and the oldest multi present on system.
*/
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/pg_resetxlog\" -O %u -m %u,%u \"%s\"",
new_cluster.bindir,
old_cluster.controldata.chkpnt_nxtmxoff,
old_cluster.controldata.chkpnt_nxtmulti,
old_cluster.controldata.chkpnt_oldstMulti,
new_cluster.pgdata);
check_ok();
}
else if (new_cluster.controldata.cat_ver >= MULTIXACT_FORMATCHANGE_CAT_VER)
{
/*
* Remove offsets/0000 file created by initdb that no longer matches
* the new multi-xid value. "members" starts at zero so no need to
* remove it.
*/
remove_new_subdir("pg_multixact/offsets", false);
prep_status("Setting oldest multixact ID on new cluster");
/*
* We don't preserve files in this case, but it's important that the
* oldest multi is set to the latest value used by the old system, so
* that multixact.c returns the empty set for multis that might be
* present on disk. We set next multi to the value following that; it
* might end up wrapped around (i.e. 0) if the old cluster had
* next=MaxMultiXactId, but multixact.c can cope with that just fine.
*/
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/pg_resetxlog\" -m %u,%u \"%s\"",
new_cluster.bindir,
old_cluster.controldata.chkpnt_nxtmulti + 1,
old_cluster.controldata.chkpnt_nxtmulti,
new_cluster.pgdata);
check_ok();
}
/* now reset the wal archives in the new cluster */
prep_status("Resetting WAL archives");
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/pg_resetxlog\" -l %s \"%s\"", new_cluster.bindir,
old_cluster.controldata.nextxlogfile,
new_cluster.pgdata);
check_ok();
}
/*
* set_frozenxids()
*
* We have frozen all xids, so set datfrozenxid, relfrozenxid, and
* relminmxid to be the old cluster's xid counter, which we just set
* in the new cluster. User-table frozenxid and minmxid values will
* be set by pg_dump --binary-upgrade, but objects not set by the pg_dump
* must have proper frozen counters.
*/
static
void
set_frozenxids(bool minmxid_only)
{
int dbnum;
PGconn *conn,
*conn_template1;
PGresult *dbres;
int ntups;
int i_datname;
int i_datallowconn;
if (!minmxid_only)
prep_status("Setting frozenxid and minmxid counters in new cluster");
else
prep_status("Setting minmxid counter in new cluster");
conn_template1 = connectToServer(&new_cluster, "template1");
if (!minmxid_only)
/* set pg_database.datfrozenxid */
PQclear(executeQueryOrDie(conn_template1,
"UPDATE pg_catalog.pg_database "
"SET datfrozenxid = '%u'",
old_cluster.controldata.chkpnt_nxtxid));
/* set pg_database.datminmxid */
PQclear(executeQueryOrDie(conn_template1,
"UPDATE pg_catalog.pg_database "
"SET datminmxid = '%u'",
old_cluster.controldata.chkpnt_nxtmulti));
/* get database names */
dbres = executeQueryOrDie(conn_template1,
"SELECT datname, datallowconn "
"FROM pg_catalog.pg_database");
i_datname = PQfnumber(dbres, "datname");
i_datallowconn = PQfnumber(dbres, "datallowconn");
ntups = PQntuples(dbres);
for (dbnum = 0; dbnum < ntups; dbnum++)
{
char *datname = PQgetvalue(dbres, dbnum, i_datname);
char *datallowconn = PQgetvalue(dbres, dbnum, i_datallowconn);
/*
* We must update databases where datallowconn = false, e.g.
* template0, because autovacuum increments their datfrozenxids,
* relfrozenxids, and relminmxid even if autovacuum is turned off,
* and even though all the data rows are already frozen To enable
* this, we temporarily change datallowconn.
*/
if (strcmp(datallowconn, "f") == 0)
PQclear(executeQueryOrDie(conn_template1,
"ALTER DATABASE %s ALLOW_CONNECTIONS = true",
quote_identifier(datname)));
conn = connectToServer(&new_cluster, datname);
if (!minmxid_only)
/* set pg_class.relfrozenxid */
PQclear(executeQueryOrDie(conn,
"UPDATE pg_catalog.pg_class "
"SET relfrozenxid = '%u' "
/* only heap, materialized view, and TOAST are vacuumed */
"WHERE relkind IN ('r', 'm', 't')",
old_cluster.controldata.chkpnt_nxtxid));
/* set pg_class.relminmxid */
PQclear(executeQueryOrDie(conn,
"UPDATE pg_catalog.pg_class "
"SET relminmxid = '%u' "
/* only heap, materialized view, and TOAST are vacuumed */
"WHERE relkind IN ('r', 'm', 't')",
old_cluster.controldata.chkpnt_nxtmulti));
PQfinish(conn);
/* Reset datallowconn flag */
if (strcmp(datallowconn, "f") == 0)
PQclear(executeQueryOrDie(conn_template1,
"ALTER DATABASE %s ALLOW_CONNECTIONS = false",
quote_identifier(datname)));
}
PQclear(dbres);
PQfinish(conn_template1);
check_ok();
}
static void
cleanup(void)
{
fclose(log_opts.internal);
/* Remove dump and log files? */
if (!log_opts.retain)
{
int dbnum;
char **filename;
for (filename = output_files; *filename != NULL; filename++)
unlink(*filename);
/* remove dump files */
unlink(GLOBALS_DUMP_FILE);
if (old_cluster.dbarr.dbs)
for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
{
char sql_file_name[MAXPGPATH],
log_file_name[MAXPGPATH];
DbInfo *old_db = &old_cluster.dbarr.dbs[dbnum];
snprintf(sql_file_name, sizeof(sql_file_name), DB_DUMP_FILE_MASK, old_db->db_oid);
unlink(sql_file_name);
snprintf(log_file_name, sizeof(log_file_name), DB_DUMP_LOG_FILE_MASK, old_db->db_oid);
unlink(log_file_name);
}
}
}
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