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WAL-log the creation of the init fork of unlogged indexes.

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We create a file, so we better WAL-log it. In practice, all the
built-in index AMs and all extensions that I'm aware of write a
metapage to the init fork, which is WAL-logged, and replay of the
metapage implicitly creates the fork too. But if ambuildempty() didn't
write any page, we would miss it.

This can be seen with dummy_index_am. Set up replication, create a
'dummy_index_am' index on an unlogged table, and look at the files
created in the replica: the init fork is not created on the
replica. Dummy_index_am doesn't do anything with the relation files,
however, so it doesn't lead to any user-visible errors.

Backpatch to all supported versions.

Reviewed-by: Robert Haas
Discussion: https://www.postgresql.org/message-id/6e5bbc08-cdfc-b2b3-9e23-1a914b9850a9%40iki.fi
This commit is contained in:
Heikki Linnakangas 2023-07-06 17:25:29 +03:00
parent 69a674a170
commit 3142a8845b
1 changed files with 2 additions and 0 deletions
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2
src/backend/catalog/index.c
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@ -54,6 +54,7 @@
#include "catalog/pg_trigger.h"
#include "catalog/pg_type.h"
#include "catalog/storage.h"
#include "catalog/storage_xlog.h"
#include "commands/event_trigger.h"
#include "commands/progress.h"
#include "commands/tablecmds.h"
@ -3044,6 +3045,7 @@ index_build(Relation heapRelation,
!smgrexists(RelationGetSmgr(indexRelation), INIT_FORKNUM))
{
smgrcreate(RelationGetSmgr(indexRelation), INIT_FORKNUM, false);
log_smgrcreate(&indexRelation->rd_locator, INIT_FORKNUM);
indexRelation->rd_indam->ambuildempty(indexRelation);
}