Re: Concurrent update failure in HEAD

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Takahiro Itagaki <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: Concurrent update failure in HEAD
Date: 2010-01-07 15:02:49
Message-ID: 23048.1262876569@sss.pgh.pa.us
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Takahiro Itagaki <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp> writes:
> I found pgbench sometimes receives responces of "UPDATE 0" from HEAD server.
> When I re-tested pgbench with 8.4.2 server, all of the results were "UPDATE 1".
> Are there known issues in HEAD for concurrent updates?

I suspect it might have something to do with the recent EvalPlanQual
rewrite, but exactly what the problem is is not clear.

regards, tom lane

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