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From: Michael Paquier <[email protected]>
To: Bertrand Drouvot <[email protected]>
Cc: Xuneng Zhou <[email protected]>
Cc: Hayato Kuroda (Fujitsu) <[email protected]>
Cc: Alexander Lakhin <[email protected]>
Cc: pgsql-hackers <[email protected]>
Subject: Re: t/035_standby_logical_decoding.pl might fail on attempt to read wrong timeline
Date: Thu, 11 Jun 2026 18:53:19 +0900
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <OS9PR01MB1214908BA67A7811BD6281208F51C2@OS9PR01MB12149.jpnprd01.prod.outlook.com>
	<CABPTF7WmLKOJcSPod7zT2hynUFQcUs0VoQyR-p=XFsafvmGm7g@mail.gmail.com>
	<CABPTF7U_B9pdC563fFONQLX_FXCZtxZgM+jN9snzMVg9b9MRfg@mail.gmail.com>
	<aibQB2f9h3nYeg/2@bdtpg>
	<CABPTF7XGDgnB97fBUQb+Tm=5NnAzS1iKTWcJTePpGinL1ZAxWQ@mail.gmail.com>
	<CABPTF7VovNWnH=dG_A=e6xkMYt11ubbj935Ymfky55cXcWcrrA@mail.gmail.com>
	<aifyiJG3uiJzCYTB@bdtpg>
	<CABPTF7XAb7ExE-7qSsKgSw3K0hfsNPzXuupQ1aJ8zXOgZ4tPNw@mail.gmail.com>
	<aimeoNYE93VLiQHt@bdtpg>
	<[email protected]>

On Thu, Jun 11, 2026 at 10:15:01AM +0900, Michael Paquier wrote:
> The backpatch of PG16 is straight-forward and adding
> GetWALInsertionTimeLineIfSet() down there does not look like an issue.
> Not having any tests in v16 feels sad, but that's life.  It does not
> prevent addressing the availability issue on this branch.

Backpatch of GetWALInsertionTimeLineIfSet() done in v16.

> I'll go take it up from here.

I have spent some time on the first part of this patch series,
focusing on the noisiest path for logical replication, and applied it
down to v17.  I have been able to reproduce the problem using
Alexander's sleep trick, and let 035 run with the same trick and the
patch applied for a few hundred runs.

Note that REL_17_STABLE has currently 4 failures in the buildfarm, due
to me messing up with the existence of injection_points.  I'll
probably just remove the test on this branch, 105b2cb33617 adding the
requirement on the module only in v18~.
--
Michael


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