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Avoid hot standby cancels from VAC FREEZE

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VACUUM FREEZE generated false cancelations of standby queries on an
otherwise idle master. Caused by an off-by-one error on cutoff_xid
which goes back to original commit.

Backpatch to all versions 9.0+

Analysis and report by Marco Nenciarini

Bug fix by Simon Riggs
This commit is contained in:
Simon Riggs 2015-06-27 00:47:34 +01:00
parent 88fab18a4c
commit ca6a11d785
1 changed files with 7 additions and 1 deletions
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8
src/backend/access/heap/heapam.c
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@ -4725,7 +4725,13 @@ heap_xlog_freeze(XLogRecPtr lsn, XLogRecord *record)
* consider the frozen xids as running.
*/
if (InHotStandby)
ResolveRecoveryConflictWithSnapshot(cutoff_xid, xlrec->node);
{
TransactionId latestRemovedXid = cutoff_xid;
TransactionIdRetreat(latestRemovedXid);
ResolveRecoveryConflictWithSnapshot(latestRemovedXid, rnode);
}
/* If we have a full-page image, restore it and we're done */
if (record->xl_info & XLR_BKP_BLOCK(0))