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Doc: Fix the ambiguity in the description of failover slots.

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The failover slots ensure a seamless transition of a subscriber after the
standby is promoted. But the docs for it also explain the behavior of
asynchronous replication which can confuse the readers.

Reported-by: Masahiro Ikeda
Backpatch-through: 17
Discussion: https://postgr.es/m/OS3PR01MB6390B660F4198BB9745E0526B18B2@OS3PR01MB6390.jpnprd01.prod.outlook.com
This commit is contained in:
Amit Kapila 2024-08-29 08:56:52 +05:30
parent 6654bb9204
commit 9d90e2bdaf
1 changed files with 2 additions and 5 deletions
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7
doc/src/sgml/logical-replication.sgml
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@ -701,10 +701,7 @@ ALTER SUBSCRIPTION
<link linkend="sql-createsubscription-params-with-failover"><literal>failover</literal></link> <link linkend="sql-createsubscription-params-with-failover"><literal>failover</literal></link>
parameter ensures a seamless transition of those subscriptions after the parameter ensures a seamless transition of those subscriptions after the
standby is promoted. They can continue subscribing to publications on the standby is promoted. They can continue subscribing to publications on the
new primary server without losing data. Note that in the case of new primary server.
asynchronous replication, there remains a risk of data loss for transactions
committed on the former primary server but have yet to be replicated to the new
primary server.
</para> </para>
<para> <para>
@ -791,7 +788,7 @@ test_standby=# SELECT slot_name, (synced AND NOT temporary AND NOT conflicting)
If all the slots are present on the standby server and the result If all the slots are present on the standby server and the result
(<literal>failover_ready</literal>) of the above SQL query is true, then (<literal>failover_ready</literal>) of the above SQL query is true, then
existing subscriptions can continue subscribing to publications now on the existing subscriptions can continue subscribing to publications now on the
new primary server without losing data. new primary server.
</para> </para>
</sect1> </sect1>