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Add GUC option to control maximum active replication origins.

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This commit introduces a new GUC option max_active_replication_origins
to control the maximum number of active replication
origins. Previously, this was controlled by
'max_replication_slots'. Having a separate GUC option provides better
flexibility for setting up subscribers, as they may not require
replication slots (for cascading replication) but always require
replication origins.

Author: Euler Taveira <euler@eulerto.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: vignesh C <vignesh21@gmail.com>
Discussion: https://postgr.es/m/b81db436-8262-4575-b7c4-bc0c1551000b@app.fastmail.com
This commit is contained in:
Masahiko Sawada
2025-03-21 12:20:15 -07:00
parent 0e032a2240
commit 04ff636cbc
12 changed files with 93 additions and 93 deletions
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10
doc/src/sgml/logical-replication.sgml
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@@ -2370,10 +2370,8 @@ CONTEXT: processing remote data for replication origin "pg_16395" during "INSER
<title>Configuration Settings</title>
<para>
Logical replication requires several configuration options to be set. Most
options are relevant only on one side of the replication. However,
<varname>max_replication_slots</varname> is used on both the publisher and
the subscriber, but it has a different meaning for each.
Logical replication requires several configuration options to be set. These
options are relevant only on one side of the replication.
</para>
<sect2 id="logical-replication-config-publisher">
@@ -2413,7 +2411,7 @@ CONTEXT: processing remote data for replication origin "pg_16395" during "INSER
<title>Subscribers</title>
<para>
<link linkend="guc-max-replication-slots-subscriber"><varname>max_replication_slots</varname></link>
<link linkend="guc-max-active-replication-origins"><varname>max_active_replication_origins</varname></link>
must be set to at least the number of subscriptions that will be added to
the subscriber, plus some reserve for table synchronization.
</para>
@@ -2580,7 +2578,7 @@ CONTEXT: processing remote data for replication origin "pg_16395" during "INSER
<listitem>
<para>
The new cluster must have
<link linkend="guc-max-replication-slots"><varname>max_replication_slots</varname></link>
<link linkend="guc-max-active-replication-origins"><varname>max_active_replication_origins</varname></link>
configured to a value greater than or equal to the number of
subscriptions present in the old cluster.
</para>