Clarify the usage of max_replication_slots on the subscriber side.

Amit Kapila · Amit Kapila · commit 8af3c233e423 · 2021-03-03T12:01:56.000+05:30
It was not clear in the docs that the max_replication_slots is also used to track replication origins on the subscriber side. Author: Paul Martinez Reviewed-by: Amit Kapila Backpatch-through: 10 where logical replication was introduced Discussion: https://postgr.es/m/CACqFVBZgwCN_pHnW6dMNCrOS7tiHCw6Retf_=U2Vvj3aUSeATw@mail.gmail.com
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
@@ -4001,6 +4001,17 @@ restore_command = 'copy "C:\\server\\archivedir\\%f" "%p"'  # Windows
          to <literal>replica</literal> or higher to allow replication slots to
          be used.
         </para>
+
+        <para>
+         On the subscriber side, specifies how many replication origins (see
+         <xref linkend="replication-origins"/>) can be tracked simultaneously,
+         effectively limiting how many logical replication subscriptions can
+         be created on the server. Setting it a lower value than the current
+         number of tracked replication origins (reflected in
+         <link linkend="view-pg-replication-origin-status">pg_replication_origin_status</link>,
+         not <link linkend="catalog-pg-replication-origin">pg_replication_origin</link>)
+         will prevent the server from starting.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/logical-replication.sgml b/doc/src/sgml/logical-replication.sgml
@@ -603,11 +603,12 @@
 
   <para>
    The subscriber also requires the <varname>max_replication_slots</varname>
-   to be set.  In this case it should be set to at least the number of
-   subscriptions that will be added to the subscriber, plus some reserve for
-   table synchronization.  <varname>max_logical_replication_workers</varname>
-   must be set to at least the number of subscriptions, again plus some reserve
-   for the table synchronization.  Additionally the <varname>max_worker_processes</varname>
+   be set to configure how many replication origins can be tracked.  In this
+   case it should be set to at least the number of subscriptions that will be
+   added to the subscriber, plus some reserve for table synchronization.
+   <varname>max_logical_replication_workers</varname> must be set to at least
+   the number of subscriptions, again plus some reserve for the table
+   synchronization.  Additionally the <varname>max_worker_processes</varname>
    may need to be adjusted to accommodate for replication workers, at least
    (<varname>max_logical_replication_workers</varname>
    + <literal>1</literal>).  Note that some extensions and parallel queries
