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In-Reply-To: <CAPpHfduJKv9-R2HcpyX9RNgteLL0M1MPS1No1WLnTsegsbG4MQ@mail.gmail.com>
From: Xuneng Zhou <xunengzhou@gmail.com>
Date: Fri, 9 Jan 2026 21:44:17 +0800
Message-ID: <CABPTF7WWxgAAr5fT9TFciU+PzeRpC3Dp7SO60AV9XWx561TNKA@mail.gmail.com>
Subject: Re: Implement waiting for wal lsn replay: reloaded
To: Alexander Korotkov <aekorotkov@gmail.com>
Cc: 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="0000000000008d05640647f4b9a7"
Archived-At: <https://www.postgresql.org/message-id/CABPTF7WWxgAAr5fT9TFciU%2BPzeRpC3Dp7SO60AV9XWx561TNKA%40mail.gmail.com>
Precedence: bulk

--0000000000008d05640647f4b9a7
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Hi,

On Fri, Jan 9, 2026 at 4:42=E2=80=AFAM Alexander Korotkov <aekorotkov@gmail=
.com> wrote:
>
> On Thu, Jan 8, 2026 at 6:29=E2=80=AFPM Xuneng Zhou <xunengzhou@gmail.com>=
 wrote:
> > On Thu, Jan 8, 2026 at 10:19=E2=80=AFPM Alexander Korotkov <aekorotkov@=
gmail.com> wrote:
> > > I see, you were right.  This is not related to the MyProc->xmin.
> > > ResolveRecoveryConflictWithTablespace() calls
> > > GetConflictingVirtualXIDs(InvalidTransactionId, InvalidOid).  That
> > > would kill WAIT FOR LSN query independently on its xmin.
> >
> > I think the concern is valid --- conflicts like
> > PROCSIG_RECOVERY_CONFLICT_SNAPSHOT could occur and terminate the
> > backend if the timing is unlucky. It's more difficult to reproduce
> > though. A check for the log containing "conflict with recovery" would
> > likely catch these conflicts as well.
>
> Yes, I found multiple reasons why xmin gets temporarily set during
> processing of WAIT FOR LSN query.  I'll soon post a draft patch to fix
> that.
>
> > > I guess your
> > > patch is the only way to go.  It's clumsy to wrap WAIT FOR LSN call
> > > with retry loop, but it would still consume less resources than
> > > polling.
> > >
> >
> > Assuming recovery conflicts are relatively rare in tap tests, except
> > for the explicitly designed tests like 031_recovery_conflict and the
> > narrow timing window that the standby has not caught up while the wait
> > for gets invoked, a simple fallback seems appropriate to me.
>
> Yes, I see.  Seems acceptable given this seems the only feasible way to g=
o.
>

Here is the updated patch with recovery conflicts handled.

--=20
Best,
Xuneng

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