From 66fbcb0d2e1b201477dd2977b6eb93b1cfd9dd6c Mon Sep 17 00:00:00 2001
From: Simon Riggs <simon@2ndQuadrant.com>
Date: Sat, 27 Jun 2015 00:41:47 +0100
Subject: [PATCH] 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
---
src/backend/access/heap/heapam.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index 208457584d9..86a2e6bae6a 100644
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -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)
--
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