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In-Reply-To: <21b44-6852e000-3-a556820@87831171>
From: Alexander Korotkov <aekorotkov@gmail.com>
Date: Wed, 18 Jun 2025 19:47:09 +0300
Message-ID: 
 <CAPpHfdv3UEUBjsLhB_CwJT0xX9LmN6U+__myYopq4KcgvCSbTg@mail.gmail.com>
Subject: Re: Slot's restart_lsn may point to removed WAL segment after hard
 restart unexpectedly
To: Vitaly Davydov <v.davydov@postgrespro.ru>
Cc: vignesh C <vignesh21@gmail.com>,
	"Hayato Kuroda (Fujitsu)" <kuroda.hayato@fujitsu.com>,
 Tom Lane <tgl@sss.pgh.pa.us>,
	Alexander Lakhin <exclusion@gmail.com>,
 Amit Kapila <amit.kapila16@gmail.com>,
	pgsql-hackers <pgsql-hackers@postgresql.org>,
 Masahiko Sawada <sawada.mshk@gmail.com>,
	"tomas@vondra.me" <tomas@vondra.me>
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On Wed, Jun 18, 2025 at 6:50=E2=80=AFPM Vitaly Davydov <v.davydov@postgresp=
ro.ru> wrote:
> > I think, it is a good idea. Once we do not use the generated data, it i=
s ok
> > just to generate WAL segments using the proposed function. I've tested =
this
> > function. The tests worked as expected with and without the fix. The at=
tached
> > patch does the change.
>
> Sorry, forgot to attach the patch. It is created on the current master br=
anch.
> It may conflict with your corrections. I hope, it could be useful.

Thank you.  I've integrated this into a patch to improve these tests.

Regarding assertion failure, I've found that assert in
PhysicalConfirmReceivedLocation() conflicts with restart_lsn
previously set by ReplicationSlotReserveWal().  As I can see,
ReplicationSlotReserveWal() just picks fresh XLogCtl->RedoRecPtr lsn.
So, it doesn't seems there is a guarantee that restart_lsn never goes
backward.  The commit in ReplicationSlotReserveWal() even states there
is a "chance that we have to retry".  Thus, I propose to remove the
assertion introduced by ca307d5cec90.

Any objection from backpatching 0001 though 17 and pushing 0002 to the head=
?

------
Regards,
Alexander Korotkov
Supabase

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