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Avoid hot standby cancels from VAC FREEZE 

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 00:41:47 +01:00
parent 7d60b2af34
commit 66fbcb0d2e
1 changed files with 4 additions and 1 deletions
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5
src/backend/access/heap/heapam.c
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@ -7572,9 +7572,12 @@ heap_xlog_freeze_page(XLogReaderState *record)
if (InHotStandby)
{
RelFileNode rnode;
TransactionId latestRemovedXid = cutoff_xid;
TransactionIdRetreat(latestRemovedXid);
XLogRecGetBlockTag(record, 0, &rnode, NULL, NULL);
ResolveRecoveryConflictWithSnapshot(cutoff_xid, rnode);
ResolveRecoveryConflictWithSnapshot(latestRemovedXid, rnode);
}
if (XLogReadBufferForRedo(record, 0, &buffer) == BLK_NEEDS_REDO)