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From: Michael Paquier <michael@paquier.xyz>
To: Ajin Cherian <itsajin@gmail.com>
Cc: Alexey Makhmutov <a.makhmutov@postgrespro.ru>
Cc: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Cc: shveta malik <shveta.malik@gmail.com>
Cc: pgsql-bugs@lists.postgresql.org
Subject: Re: Standby server with cascade logical replication could not be properly stopped under load
Date: Fri, 30 May 2025 08:32:05 +0900
Message-ID: <aDjudRqTXYJCt3VT@paquier.xyz> (raw)
In-Reply-To: <CAFPTHDZu40jysBrqmSYHpumoEDFDs8JoZL3hsN80rFt394Fttw@mail.gmail.com>
References: <52138028-7246-421c-9161-4fa108b88070@postgrespro.ru>
	<CAJpy0uA9kw9WLWETPg+upwzBu145vMB7sPZwBuR_vDrbazeuag@mail.gmail.com>
	<d9e1c765-7f83-4015-ade3-16506854d0b1@postgrespro.ru>
	<aC9DXHt/MwFCW6Is@ip-10-97-1-34.eu-west-3.compute.internal>
	<f2575904-acfe-4037-9748-61fdb4a7abe4@postgrespro.ru>
	<aDa83q7wJt6II3Iq@paquier.xyz>
	<a4f477e0-5d17-466b-a8cc-e0d905d1161b@postgrespro.ru>
	<aDgGXArm-CGh1pSG@paquier.xyz>
	<CAFPTHDZu40jysBrqmSYHpumoEDFDs8JoZL3hsN80rFt394Fttw@mail.gmail.com>

On Thu, May 29, 2025 at 08:28:01PM +1000, Ajin Cherian wrote:
> I think this new fix is much better and cleaner. A suggestion for the
> comment:
> "For cascading logical WAL senders, we use the replay LSN instead of the
> flush LSN, since logical decoding on a standby only processes WAL that has
> been replayed. This distinction becomes particularly important during
> shutdown, as new WAL is no longer replayed and the last replayed LSN marks
> the furthest point up to which decoding can proceed."

Yes, that sounds better than my previous suggestion.  Thanks.
--
Michael

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