From: Amit Kapila <akapila@postgresql.org>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: pg_createsubscriber: Fix an unpredictable recovery wait time.
Date: Tue, 30 Jul 2024 09:01:00 +0000
Message-ID: <E1sYij6-001rwI-C1@gemulon.postgresql.org> (raw)
pg_createsubscriber: Fix an unpredictable recovery wait time.
The problem is that the tool is using the LSN returned by
pg_create_logical_replication_slot() as recovery_target_lsn. This LSN is
ahead of the current WAL position and the recovery waits until the
publisher writes a WAL record to reach the target and ends the recovery.
On idle systems, this wait time is unpredictable and could lead to failure
in promoting the subscriber. To avoid that, insert a harmless WAL record.
Reported-by: Alexander Lakhin and Tom Lane
Diagnosed-by: Hayato Kuroda
Author: Euler Taveira
Reviewed-by: Hayato Kuroda, Amit Kapila
Backpatch-through: 17
Discussion: https://postgr.es/m/2377319.1719766794%40sss.pgh.pa.us
Discussion: https://postgr.es/m/CA+TgmoYcY+Wb67NAwaHT7MvxCSeV86oSc+va9hHKaasE42ukyw@mail.gmail.com
Branch
------
REL_17_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/e5ba6a5ab62ce05e2a762b4d26f0fd0c52c7b521
Modified Files
--------------
src/bin/pg_basebackup/pg_createsubscriber.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
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To: pgsql-committers@postgresql.org
Cc: akapila@postgresql.org, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: pg_createsubscriber: Fix an unpredictable recovery wait time.
In-Reply-To: <E1sYij6-001rwI-C1@gemulon.postgresql.org>
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