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In-Reply-To: <57210.1769801636@localhost>
From: Mihail Nikalayeu <mihailnikalayeu@gmail.com>
Date: Sun, 1 Feb 2026 20:46:31 +0100
Message-ID: <CADzfLwUukiGOPoUkDgf6oEB-Y0TnNy6UFUN4obnU-AN5W1N=sw@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="000000000000ce6fd20649c878eb"
Archived-At: <https://www.postgresql.org/message-id/CADzfLwUukiGOPoUkDgf6oEB-Y0TnNy6UFUN4obnU-AN5W1N%3Dsw%40mail.gmail.com>
Precedence: bulk

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Hello!


PART 1:

--------------

Something still wrong with 0006, check:

'pgbench: error: client 12 script 0 aborted in command 2 query 0: ERROR:
 attempted to overwrite invisible tuple
https://cirrus-ci.com/task/6385612527239168?logs=test_world#L300

But it is hard to reproduce - happened once.

--------------

Also, once I got
[16:25:18.641] #   at /tmp/cirrus-ci-build/contrib/amcheck/t/
007_repack_concurrently.pl line 57.
[16:25:18.641] #                   'pgbench: error: client 6 script 0
aborted in command 2 query 0: ERROR:  relation 21856 deleted while still in
use
https://cirrus-ci.com/task/4686014242881536?logs=test_world#L384

It was the PROC_IN_REPACK version (see below), but I think it is not
related to it. But I'm not 100% sure.


PART 2:

> I'm considering a special kind of relation whose catalog entries remain
in the
>  catalog cache and are never written to the catalog tables. (Unlike
temporary
>  relation, it'd be WAL logged so that REPACK can be replayed on standby.)

I think it is too complicated, especially including replication logic.
Approach with catalog-only xid is much simpler, it was even committed (yes,
reverted but because of another reason).

Essentially we have two issues:
1) make sure catalog entities are not dropped because the vacuum
2) make sure data in new table is not vacuumed also

For the first PROC_IN_REPACK is enough.
For second - depends if MVCC-safe (original xmin/xmax) are preserved. If
yes - looks like nothing more needed.

If not - just prevent the vacuum from touching the table (but, looks like
it is done already, because lock is held on NewHeap until commit).
And additionally reset snapshots during the index building itself, but it
is scope of another patch.

I have implemented PROC_IN_REPACK POC  in the attached patch.

Also, I am still not sure if MVCC-safe implementation is worth
its complexity compared with "relcheckxmin"approach [0].

[0]:
https://www.postgresql.org/message-id/CADzfLwUEH5%2BLjCN%2B6kRfSsXwuou8rKXyVV42Wi-O_TG0360Kug%40mail.gmail.com

Best regards,
Mikhail.

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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr">Hello!</div><div dir=3D"=
ltr"><br></div><div dir=3D"ltr"><br></div><div>PART 1:</div><div><br></div>=
<div>--------------</div><div><br></div><div>Something still wrong with 000=
6, check:</div><div><br>&#39;pgbench: error: client 12 script 0 aborted in =
command 2 query 0: ERROR: =C2=A0attempted to overwrite invisible tuple</div=
><div dir=3D"ltr"><a href=3D"https://cirrus-ci.com/task/6385612527239168?lo=
gs=3Dtest_world#L300">https://cirrus-ci.com/task/6385612527239168?logs=3Dte=
st_world#L300</a></div><div dir=3D"ltr"><br></div><div>But it is hard to re=
produce - happened once.</div><div><br></div><div>--------------</div><div>=
<br></div><div>Also, once I got</div><div>[16:25:18.641] # =C2=A0 at /tmp/c=
irrus-ci-build/contrib/amcheck/t/<a href=3D"http://007_repack_concurrently.=
pl">007_repack_concurrently.pl</a> line 57.<br>[16:25:18.641] # =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 &#39;pgbench: error: c=
lient 6 script 0 aborted in command 2 query 0: ERROR: =C2=A0relation 21856 =
deleted while still in use</div><div><a href=3D"https://cirrus-ci.com/task/=
4686014242881536?logs=3Dtest_world#L384">https://cirrus-ci.com/task/4686014=
242881536?logs=3Dtest_world#L384</a></div><div><br></div><div>It was the PR=
OC_IN_REPACK version (see below), but I think it is not related to it. But =
I&#39;m not 100% sure.</div><div><br></div><div dir=3D"ltr"><br></div><div>=
PART 2:</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">&gt; I&#39;m consi=
dering a special kind of relation whose catalog entries remain in the<br>&g=
t;=C2=A0 catalog cache and are never written to the catalog tables. (Unlike=
 temporary<br>&gt;=C2=A0 relation, it&#39;d be WAL logged so that REPACK ca=
n be replayed on standby.)</div><div dir=3D"ltr"><br></div><div>I think it =
is too complicated, especially including=C2=A0replication logic.</div><div>=
Approach=C2=A0with catalog-only xid is much simpler, it was even committed =
(yes, reverted but because of another reason).</div><div><br></div><div>Ess=
entially we have two issues:</div><div>1) make sure catalog entities are no=
t dropped because the vacuum</div><div>2) make sure data=C2=A0in new table =
is not vacuumed also</div><div><br></div><div>For the first PROC_IN_REPACK =
is enough.</div><div>For second - depends if MVCC-safe (original xmin/xmax)=
 are preserved. If yes - looks like nothing more needed.</div><div><br></di=
v><div>If not - just=C2=A0prevent the vacuum from touching=C2=A0the table (=
but, looks like it is done already, because lock is held on NewHeap until c=
ommit).</div><div>And additionally reset snapshots during the index buildin=
g itself, but it is scope of another patch.</div><div><br></div><div>I have=
 implemented PROC_IN_REPACK POC=C2=A0 in the attached patch.</div><div><br>=
</div><div>Also, I am still not sure if MVCC-safe implementation is worth i=
ts=C2=A0complexity compared with &quot;relcheckxmin&quot;approach [0].</div=
><div><br></div><div>[0]:=C2=A0<a href=3D"https://www.postgresql.org/messag=
e-id/CADzfLwUEH5%2BLjCN%2B6kRfSsXwuou8rKXyVV42Wi-O_TG0360Kug%40mail.gmail.c=
om" target=3D"_blank">https://www.postgresql.org/message-id/CADzfLwUEH5%2BL=
jCN%2B6kRfSsXwuou8rKXyVV42Wi-O_TG0360Kug%40mail.gmail.com</a></div><div><br=
></div><div>Best regards,</div><div>Mikhail.</div><div><br></div></div>
</div>

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