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amcheck: Skip unlogged relations during recovery. 

contrib/amcheck failed to consider the possibility that unlogged
relations will not have any main relation fork files when running in hot
standby mode.  This led to low-level "can't happen" errors that complain
about the absence of a relfilenode file.

To fix, simply skip verification of unlogged index relations during
recovery.  In passing, add a direct check for the presence of a main
fork just before verification proper begins, so that we cleanly verify
the presence of the main relation fork file.

Author: Andrey Borodin, Peter Geoghegan
Reported-By: Andrey Borodin
Diagnosed-By: Andrey Borodin
Discussion: https://postgr.es/m/DA9B33AC-53CB-4643-96D4-7A0BBC037FA1@yandex-team.ru
Backpatch: 10-, where amcheck was introduced.
This commit is contained in:
Peter Geoghegan 2019-08-12 15:21:32 -07:00
parent 03c811a483
commit 6754fe65a4
1 changed files with 40 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
contrib/amcheck/verify_nbtree.c
View File

@ -35,6 +35,7 @@
#include "lib/bloomfilter.h"
#include "miscadmin.h"
#include "storage/lmgr.h"
#include "storage/smgr.h"
#include "utils/memutils.h"
#include "utils/snapmgr.h"
@ -128,6 +129,7 @@ PG_FUNCTION_INFO_V1(bt_index_parent_check);
static void bt_index_check_internal(Oid indrelid, bool parentcheck,
bool heapallindexed, bool rootdescend);
static inline void btree_index_checkable(Relation rel);
static inline bool btree_index_mainfork_expected(Relation rel);
static void bt_check_every_level(Relation rel, Relation heaprel,
bool heapkeyspace, bool readonly, bool heapallindexed,
bool rootdescend);
@ -225,7 +227,6 @@ bt_index_check_internal(Oid indrelid, bool parentcheck, bool heapallindexed,
Oid heapid;
Relation indrel;
Relation heaprel;
bool heapkeyspace;
LOCKMODE lockmode;
if (parentcheck)
@ -275,10 +276,22 @@ bt_index_check_internal(Oid indrelid, bool parentcheck, bool heapallindexed,
/* Relation suitable for checking as B-Tree? */
btree_index_checkable(indrel);
/* Check index, possibly against table it is an index on */
heapkeyspace = _bt_heapkeyspace(indrel);
bt_check_every_level(indrel, heaprel, heapkeyspace, parentcheck,
heapallindexed, rootdescend);
if (btree_index_mainfork_expected(indrel))
{
bool heapkeyspace;
RelationOpenSmgr(indrel);
if (!smgrexists(indrel->rd_smgr, MAIN_FORKNUM))
ereport(ERROR,
(errcode(ERRCODE_INDEX_CORRUPTED),
errmsg("index \"%s\" lacks a main relation fork",
RelationGetRelationName(indrel))));
/* Check index, possibly against table it is an index on */
heapkeyspace = _bt_heapkeyspace(indrel);
bt_check_every_level(indrel, heaprel, heapkeyspace, parentcheck,
heapallindexed, rootdescend);
}
/*
* Release locks early. That's ok here because nothing in the called
@ -324,6 +337,28 @@ btree_index_checkable(Relation rel)
errdetail("Index is not valid.")));
}
/*
* Check if B-Tree index relation should have a file for its main relation
* fork. Verification uses this to skip unlogged indexes when in hot standby
* mode, where there is simply nothing to verify.
*
* NB: Caller should call btree_index_checkable() before calling here.
*/
static inline bool
btree_index_mainfork_expected(Relation rel)
{
if (rel->rd_rel->relpersistence != RELPERSISTENCE_UNLOGGED ||
!RecoveryInProgress())
return true;
ereport(NOTICE,
(errcode(ERRCODE_READ_ONLY_SQL_TRANSACTION),
errmsg("cannot verify unlogged index \"%s\" during recovery, skipping",
RelationGetRelationName(rel))));
return false;
}
/*
* Main entry point for B-Tree SQL-callable functions. Walks the B-Tree in
* logical order, verifying invariants as it goes. Optionally, verification