pgsql: Avoid hot standby cancels from VAC FREEZE

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql: Avoid hot standby cancels from VAC FREEZE
Date: 2015-06-26 23:50:00
Message-ID: E1Z8dNg-0006Xl-LE@gemulon.postgresql.org
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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

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/9af67b667cca10b3f458548c90a75e4e45ced2b3

Modified Files
--------------
src/backend/access/heap/heapam.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

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