From: "Zhijie Hou (Fujitsu)" <houzj.fnst@fujitsu.com>
To: Antonin Houska <ah@cybertec.at>, Alvaro Herrera <alvherre@alvh.no-ip.org>
CC: Amit Kapila <amit.kapila16@gmail.com>, "Hayato Kuroda (Fujitsu)"
	<kuroda.hayato@fujitsu.com>, Srinath Reddy Sadipiralla
	<srinath2133@gmail.com>, Mihail Nikalayeu <mihailnikalayeu@gmail.com>,
	Matthias van de Meent <boekewurm+postgres@gmail.com>, Pg Hackers
	<pgsql-hackers@lists.postgresql.org>, Robert Treat <rob@xzilla.net>
Subject: RE: Adding REPACK [concurrently]
Thread-Topic: Adding REPACK [concurrently]
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Date: Mon, 25 May 2026 06:26:52 +0000
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> -----Original Message-----
> From: Antonin Houska <ah@cybertec.at>
> Sent: Friday, April 10, 2026 9:22 PM
> To: Hou, Zhijie/=1B$B8t=1B(B =1B$B;V[?=1B(B <houzj.fnst@fujitsu.com>
> Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>; Amit Kapila
> <amit.kapila16@gmail.com>; Kuroda, Hayato/=1B$B9uED=1B(B =1B$BH;?M=1B(B
> <kuroda.hayato@fujitsu.com>; Srinath Reddy Sadipiralla
> <srinath2133@gmail.com>; Mihail Nikalayeu <mihailnikalayeu@gmail.com>;
> Matthias van de Meent <boekewurm+postgres@gmail.com>; Pg Hackers
> <pgsql-hackers@lists.postgresql.org>; Robert Treat <rob@xzilla.net>
> Subject: Re: Adding REPACK [concurrently]
>=20
> Zhijie Hou (Fujitsu) <houzj.fnst@fujitsu.com> wrote:
>=20
> > When testing REPACK concurrently, I noticed that all WALs are retained
> > from the moment REPACK begins copying data to the new table until the
> > command finishes replaying concurrent changes on the new table and
> > stops the repack decoding worker.
> >
> > I understand the reason: the REPACK command itself starts a
> > long-running transaction, and logical decoding does not advance
> > restart_lsn beyond the oldest running transaction's start position. As
> > a result, slot.restart_lsn remains unchanged, preventing the checkpoint=
er
> from recycling WALs.
>=20
> I think you're right, sorry for the omission.
>=20
> > IIUC, REPACK without using concurrent option does not have this issue.
>=20
> It does not have the WAL recycling issue because it does not need to read
> WAL. However it also runs in a long transaction. Even though it does not =
need
> XID for the actual heap rewriting, it gets one at the moment it locks the=
 table
> using AccessExclusiveLock (which is at the very beginning).
>=20
> > Given that we do not restart a REPACK, I think the repack decoding
> > worker should be able to advance restart_lsn each time after writing
> > changes (similar to how a physical slot behaves). To illustrate this,
> > I've written a patch (attached) that implements this approach, and it w=
orks
> fine for me.
>=20
> LGTM, thanks!
>=20

Thanks for reviewing!

After listening to the REPACK talk at pgconf.dev this year, I understand th=
at
WAL accumulation during REPACK CONCURRENTLY is not intended behavior. I thi=
nk we
can consider fixing this in the current release. Attached is the rebased
patch, with comments adjusted based on Chao Li's comments.

Best Regards,
Hou zj

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