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In-Reply-To: <27597.1770395398@localhost>
From: Mihail Nikalayeu <mihailnikalayeu@gmail.com>
Date: Sat, 7 Feb 2026 15:16:27 +0100
Message-ID: <CADzfLwWNv5QDn6qmxCRV-p_ijSTGwNcEZFCOXt09+RmpSG2=+w@mail.gmail.com>
Subject: Re: Adding REPACK [concurrently]
To: Antonin Houska <ah@cybertec.at>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>, 
	Pg Hackers <pgsql-hackers@lists.postgresql.org>, Robert Treat <rob@xzilla.net>
Content-Type: multipart/mixed; boundary="00000000000063b046064a3c8f11"
Archived-At: <https://www.postgresql.org/message-id/CADzfLwWNv5QDn6qmxCRV-p_ijSTGwNcEZFCOXt09%2BRmpSG2%3D%2Bw%40mail.gmail.com>
Precedence: bulk

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Hi!

> Indeed, the server log seems to indicate relationship to
> VACUUM:
> 2026-02-01 16:44:58.878 UTC autovacuum worker[22589] LOG:  automatic
vacuum of table "postgres.pg_catalog.pg_class": index scans: 1

O, it's a good clue!

I have added some vacuum calls for pg_class in a stress test - and now it
fails much more often (check attachment).

It is "ERROR:  cache lookup failed for relation" - but I think it may share
the cause with "attempted to overwrite invisible tuple.

See:
https://cirrus-ci.com/build/4852126532239360 - with "Use multiple snapshots
to copy the data."
https://cirrus-ci.com/build/6429084491710464 - with "Use background worker
to do logical decoding."

But I am unable to reproduce the issue with only "Add CONCURRENTLY option
to REPACK command."
https://cirrus-ci.com/build/6467070524653568


Best regards,
Mikhail.

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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div>Hi!</div><div><br><=
/div><div>&gt;=C2=A0Indeed, the server log seems to indicate relationship t=
o<br>&gt; VACUUM:</div><div>&gt; 2026-02-01 16:44:58.878 UTC autovacuum wor=
ker[22589] LOG:=C2=A0 automatic vacuum of table &quot;postgres.pg_catalog.p=
g_class&quot;: index scans: 1<br></div><div><br></div><div>O, it&#39;s a go=
od clue!</div><div><br></div><div>I have added some vacuum=C2=A0calls for p=
g_class in a stress test - and now it fails much more often (check attachme=
nt).</div><div><br></div><div>It is &quot;ERROR: =C2=A0cache lookup failed =
for relation&quot; - but I think=C2=A0it may share the cause with &quot;att=
empted to overwrite invisible tuple.</div><div><br></div><div>See:</div><di=
v><a href=3D"https://cirrus-ci.com/build/4852126532239360" target=3D"_blank=
">https://cirrus-ci.com/build/4852126532239360</a> - with &quot;Use multipl=
e snapshots to copy the data.&quot;</div><div><a href=3D"https://cirrus-ci.=
com/build/6429084491710464" target=3D"_blank">https://cirrus-ci.com/build/6=
429084491710464</a> - with &quot;Use background worker to do logical decodi=
ng.&quot;</div><div><br></div><div>But I am unable to reproduce the issue w=
ith only &quot;Add CONCURRENTLY option to REPACK command.&quot;</div><div><=
a href=3D"https://cirrus-ci.com/build/6467070524653568" target=3D"_blank">h=
ttps://cirrus-ci.com/build/6467070524653568</a></div><div><br></div><div><b=
r></div><div>Best regards,</div><div>Mikhail.</div><div><br></div></div>
</div>
</div>

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Content-Type: application/x-patch; 
	name="nocfbot-vX-0001-stress-tests-for-repack-concurrently.patch"
Content-Disposition: attachment; 
	filename="nocfbot-vX-0001-stress-tests-for-repack-concurrently.patch"
Content-Transfer-Encoding: base64
Content-ID: <f_mlcc8erc0>
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