From: "Hayato Kuroda (Fujitsu)" <kuroda.hayato@fujitsu.com>
To: 'Bertrand Drouvot' <bertranddrouvot.pg@gmail.com>, Alexander Lakhin
	<exclusion@gmail.com>, "xunengzhou@gmail.com" <xunengzhou@gmail.com>
CC: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: RE: t/035_standby_logical_decoding.pl might fail on attempt to read
 wrong timeline
Thread-Topic: t/035_standby_logical_decoding.pl might fail on attempt to read
 wrong timeline
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Date: Mon, 8 Jun 2026 04:25:45 +0000
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--_002_OS9PR01MB1214908BA67A7811BD6281208F51C2OS9PR01MB12149jp_
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Hi Alexander, Bertrand, Xuneng,

Thanks for seeing the failure. Our team also recognized but could not find =
the reason.

> Yeah, it looks like there is a race condition here. I think we should che=
ck if
> the insertion timeline has already been set (like the walsummarizer is do=
ing).

Sorry for stupid question; I tried to reproduce the failure but could not, =
see attached.

IIUC, the issue can happen if the walsender must read the WAL record genera=
ted
after the promotion but the timeline could not be updated.=20

However, I think logical_read_xlog_page() is called after the new WAL recor=
ds
are generated, i.e., am_cascading_walsender has already been false at that =
time.
So not sure where is the race?

Best regards,
Hayato Kuroda
FUJITSU LIMITED


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