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From: Xuneng Zhou <xunengzhou@gmail.com>
Date: Tue, 26 May 2026 23:53:14 +0800
Message-ID: 
 <CABPTF7Xp0fUK0LiZVeGSNse3Wb6jRy_c9u2TOOBhmgx3K3KACA@mail.gmail.com>
Subject: Re: Implement waiting for wal lsn replay: reloaded
To: Alexander Korotkov <aekorotkov@gmail.com>
Cc: Alexander Lakhin <exclusion@gmail.com>,
 Heikki Linnakangas <hlinnaka@iki.fi>,
	Peter Eisentraut <peter@eisentraut.org>, Andres Freund <andres@anarazel.de>,
	Thomas Munro <thomas.munro@gmail.com>,
 =?UTF-8?Q?=C3=81lvaro_Herrera?= <alvherre@kurilemu.de>,
	Chao Li <li.evan.chao@gmail.com>,
 pgsql-hackers <pgsql-hackers@lists.postgresql.org>,
	Michael Paquier <michael@paquier.xyz>, jian he <jian.universality@gmail.com>,
	Tomas Vondra <tomas@vondra.me>, Yura Sokolov <y.sokolov@postgrespro.ru>
Content-Type: multipart/mixed; boundary="000000000000eed9530652ba7ecc"
Archived-At: 
 <https://www.postgresql.org/message-id/CABPTF7Xp0fUK0LiZVeGSNse3Wb6jRy_c9u2TOOBhmgx3K3KACA%40mail.gmail.com>
Precedence: bulk

--000000000000eed9530652ba7ecc
Content-Type: text/plain; charset="UTF-8"
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On Tue, May 26, 2026 at 9:48=E2=80=AFAM Xuneng Zhou <xunengzhou@gmail.com> =
wrote:
>
> On Mon, May 25, 2026 at 5:00=E2=80=AFPM Alexander Korotkov <aekorotkov@gm=
ail.com> wrote:
> >
> > On Sat, May 23, 2026 at 9:40=E2=80=AFPM Xuneng Zhou <xunengzhou@gmail.c=
om> wrote:
> > >> > I agree with you.  But do we actually need a
> > >> > wait_for_standby_and_slot_catchup() wrapper.  I think we can call
> > >> > $node->wait_for_slot_catchup() directly and simplify the fix.  Che=
ck
> > >> > the attached patch.
> > >> >
> > >>
> > >> The patch looks good to me. I agree that the wait_for_slot_catchup i=
s
> > >> not needed and could be misleading. This change would make the exact
> > >> synchronization point and its intention clearer. The only price we
> > >> need to pay here is bringing back the polling. But it seems acceptab=
le
> > >> since the cost was there in the pre-wait-for-lsn era. And thanks for
> > >> writing the great commit message!
> > >
> > >
> > > Sorry for copy-pasting the wrong function name. It should be wait_for=
_catchup().
> >
> > Good, thank you.  I'll push it if no objections.
>
> While reading 019_replslot_limit.pl, Codex pointed out a few
> inconsistencies in the comments. I verified them and they look real.
> Would you mind doing a small cleanup as well?

I updated the comment above wait_for_slot_catchup to reflect its usage.

--=20
Regards,
Xuneng Zhou
HighGo Software Co., Ltd.

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