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Clarify the usage of max_replication_slots on the subscriber side. 

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
This commit is contained in:
Amit Kapila 2021-03-03 12:01:56 +05:30
parent e527a99055
commit 8af3c233e4
2 changed files with 17 additions and 5 deletions
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11
doc/src/sgml/config.sgml
View File

@ -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>

11
doc/src/sgml/logical-replication.sgml
View File

@ -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