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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Bruce Momjian <bruce@momjian.us>
Cc: Jonathan S. Katz <jkatz@postgresql.org>
Cc: Noah Misch <noah@leadboat.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Andrew Dunstan <andrew@dunslane.net>
Cc: Michael Paquier <michael@paquier.xyz>
Cc: Justin Pryzby <pryzby@telsasoft.com>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Cc: Shruthi Gowda <gowdashru@gmail.com>
Subject: Re: pg15b2: large objects lost on upgrade
Date: Mon, 08 Aug 2022 21:51:46 -0400
Message-ID: <758596.1660009906@sss.pgh.pa.us> (raw)
In-Reply-To: <YvGxcY6RotGTFSjl@momjian.us>
References: <4152163.1659124804@sss.pgh.pa.us>
	<CA+TgmoY=MfT2uc=N!4sAcHf3_teqYBNtmqVrVYv5oEK=4RfxATw@mail.gmail.com>
	<CA+TgmoZX6Zz4KU2enOYyc+aQWA+S5ZaZRGo6BgxW7mNF4btqaw@mail.gmail.com>
	<125444.1659136594@sss.pgh.pa.us>
	<20220730054401.GB3644221@rfd.leadboat.com>
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	<635c8809-3525-7dae-a1a1-0d9069cd86bc@postgresql.org>
	<2657259.1659460333@sss.pgh.pa.us>
	<d0a4f263-a774-394d-134f-4edce6a980e4@postgresql.org>
	<2684751.1659468725@sss.pgh.pa.us>
	<YvGxcY6RotGTFSjl@momjian.us>

Bruce Momjian <bruce@momjian.us> writes:
>> Hmmm ... now that you mention it, I see nothing in 002_pg_upgrade.pl
>> that attempts to turn off autovacuum on either the source server or
>> the destination.  So one plausible theory is that autovac moved the
>> numbers since we checked.

> Uh, pg_upgrade assumes autovacuum is not running, and tries to enforce
> this:

The problems come from autovac running before or after pg_upgrade.

> Perhaps the test script should do something similar,

I'm not on board with that, for the reasons I gave upthread.

			regards, tom lane





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