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From: Tom Lane <tgl@sss.pgh.pa.us>
To: George Pavlov <gpavlov@mynewplace.com>
Cc: Ed L. <pgsql@bluepolka.net>
Cc: pgsql-general@postgresql.org
Subject: Re: query log corrupted-looking entries
Date: Thu, 07 Jun 2007 21:17:41 -0400
Message-ID: <11458.1181265461@sss.pgh.pa.us> (raw)
In-Reply-To: <8C5B026B51B6854CBE88121DBF097A86DEA716@ehost010-33.exch010.intermedia.net>
References: <29860.1161202644@sss.pgh.pa.us>
	<8C5B026B51B6854CBE88121DBF097A86C39FC2@ehost010-33.exch010.intermedia.net>
	<200705291119.55567.pgsql@bluepolka.net>
	<8C5B026B51B6854CBE88121DBF097A86CDD9A4@ehost010-33.exch010.intermedia.net>
	<24195.1180733773@sss.pgh.pa.us>
	<8C5B026B51B6854CBE88121DBF097A86CDD9D2@ehost010-33.exch010.intermedia.net>
	<24885.1180736713@sss.pgh.pa.us>
	<8C5B026B51B6854CBE88121DBF097A86CDDA32@ehost010-33.exch010.intermedia.net>
	<8C5B026B51B6854CBE88121DBF097A86DEA716@ehost010-33.exch010.intermedia.net>

"George Pavlov" <gpavlov@mynewplace.com> writes:
> I tried the patch and it has no effect whatsoever -- even with the
> patch, under the correct load the corrupted entries are coming fast and
> furious (I found a load profile on my app that reproduces these very
> clearly).

What are the total lengths of the log entries in which you see the
failure?  (The "length" here includes all the lines belonging to a
single logical entry, eg, ERROR, DETAIL, HINT.)

I believe that this shouldn't be happening except in the case in which
the entry-interpolated-into exceeds PIPE_BUF bytes.  I'm not entirely
sure what PIPE_BUF is on Linux machines, but IIRC the Posix spec says it
has to be at least 512, and on older Unix kernels it tends to be 8K.

			regards, tom lane



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