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SSI patch version 10

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: <pgsql-hackers(at)postgresql(dot)org>, Anssi Kääriäinen <anssi(dot)kaariainen(at)thl(dot)fi>
Cc: "Dan Ports" <drkp(at)csail(dot)mit(dot)edu>, "john(dot)okite(at)gmail(dot)org" <john(dot)okite(at)gmail(dot)org>
Subject: SSI patch version 10
Date: 2011-01-11 23:27:40
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Anssi Kääriäinen<anssi(dot)kaariainen(at)thl(dot)fi> wrote:
> something seems to be broken when using partial indexes.
Boy do I feel dumb for taking all day to find the cause.
The problem was a misdirected optimization -- on an update it was
only checking the "after" image for conflict, assuming that it would
be redundant to check both the before and after images.  The problem
is that with a partial index, you might only see one of those
tuples, and I suspect there could be bugs with updates which changed
a value later used for access.
The evil premature optimization is eliminated here:;a=commitdiff;h=a9c63f9c688629e2f6f92a880c5f1ac9669bf77d
This also includes an attempt to eliminate the assertion failure Dan
found in DBT-2 testing yesterday.  I'm not sure if this change is
radical enough, but I figured it was better to try the minimal
change first, and see if that was sufficient.  If not, I'll have to
move some code between functions, and duplicate a bit of code.
New patch (version 10) attached.

Attachment: ssi-10.patch.gz
Description: application/octet-stream (60.9 KB)

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