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Raise a WARNING for max_slot_wal_keep_size in pg_createsubscriber.

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During the pg_createsubscriber execution, it is possible that the required
WAL is removed from the primary/publisher node due to
'max_slot_wal_keep_size'.

This patch raises a WARNING during the '--dry-run' mode if the
'max_slot_wal_keep_size' is set to a non-default value on the
primary/publisher node.

Author: Shubham Khanna <khannashubham1197@gmail.com>
Reviewed-by: Peter Smith <smithpb2250@gmail.com>
Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com>
Reviewed-by: Vignesh C <vignesh21@gmail.com>
Discussion: https://postgr.es/m/CAHv8Rj+deqsQXOMa7Tck8CBQUbsua=+4AuMVQ2=MPM0f-ZHbjA@mail.gmail.com
This commit is contained in:
Amit Kapila
2025-02-18 12:15:43 +05:30
parent 53d3daa491
commit 217919dd09
2 changed files with 26 additions and 1 deletions
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7
doc/src/sgml/ref/pg_createsubscriber.sgml
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@ -377,6 +377,13 @@ PostgreSQL documentation
server. If the target server has a standby, replication will break and a
fresh standby should be created.
</para>
<para>
Replication failures can occur if required WAL files are missing. To prevent
this, the source server must set
<xref linkend="guc-max-slot-wal-keep-size"/> to <literal>-1</literal> to
ensure that required WAL files are not prematurely removed.
</para>
</refsect2>
<refsect2>