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Avoid unnecessary shared invalidations in ROLLBACK PREPARED

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The performance gain is minimal, but this makes the logic more
consistent with AtEOXact_Inval().  No other invalidation is needed in
this case as PREPARE takes already care of sending any local ones.

Author: Liu Huailing
Reviewed-by: Tom Lane, Michael Paquier
Discussion: https://postgr.es/m/OSZPR01MB6215AA84D71EF2B3D354CF86BE139@OSZPR01MB6215.jpnprd01.prod.outlook.com
This commit is contained in:
Michael Paquier 2021-08-12 20:12:47 +09:00
parent c3928b467a
commit 710796f054
1 changed files with 10 additions and 6 deletions
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16
src/backend/access/transam/twophase.c
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@ -1520,13 +1520,17 @@ FinishPreparedTransaction(const char *gid, bool isCommit)
* Handle cache invalidation messages.
*
* Relcache init file invalidation requires processing both before and
* after we send the SI messages. See AtEOXact_Inval()
* after we send the SI messages, only when committing. See
* AtEOXact_Inval().
*/
if (hdr->initfileinval)
RelationCacheInitFilePreInvalidate();
SendSharedInvalidMessages(invalmsgs, hdr->ninvalmsgs);
if (hdr->initfileinval)
RelationCacheInitFilePostInvalidate();
if (isCommit)
{
if (hdr->initfileinval)
RelationCacheInitFilePreInvalidate();
SendSharedInvalidMessages(invalmsgs, hdr->ninvalmsgs);
if (hdr->initfileinval)
RelationCacheInitFilePostInvalidate();
}
/*
* Acquire the two-phase lock. We want to work on the two-phase callbacks