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Allow to enable failover property for replication slots via SQL API.

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This commit adds the failover property to the replication slot. The
failover property indicates whether the slot will be synced to the standby
servers, enabling the resumption of corresponding logical replication
after failover. But note that this commit does not yet include the
capability to sync the replication slot; the subsequent commits will add
that capability.

A new optional parameter 'failover' is added to the
pg_create_logical_replication_slot() function. We will also enable to set
'failover' option for slots via the subscription commands in the
subsequent commits.

The value of the 'failover' flag is displayed as part of
pg_replication_slots view.

Author: Hou Zhijie, Shveta Malik, Ajin Cherian
Reviewed-by: Peter Smith, Bertrand Drouvot, Dilip Kumar, Masahiko Sawada, Nisha Moond, Kuroda, Hayato, Amit Kapila
Discussion: https://postgr.es/m/514f6f2f-6833-4539-39f1-96cd1e011f23@enterprisedb.com
This commit is contained in:
Amit Kapila
2024-01-25 12:15:46 +05:30
parent 86232a49a4
commit c393308b69
16 changed files with 141 additions and 25 deletions
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11
doc/src/sgml/func.sgml
View File

@ -27707,7 +27707,7 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
<indexterm>
<primary>pg_create_logical_replication_slot</primary>
</indexterm>
<function>pg_create_logical_replication_slot</function> ( <parameter>slot_name</parameter> <type>name</type>, <parameter>plugin</parameter> <type>name</type> <optional>, <parameter>temporary</parameter> <type>boolean</type>, <parameter>twophase</parameter> <type>boolean</type> </optional> )
<function>pg_create_logical_replication_slot</function> ( <parameter>slot_name</parameter> <type>name</type>, <parameter>plugin</parameter> <type>name</type> <optional>, <parameter>temporary</parameter> <type>boolean</type>, <parameter>twophase</parameter> <type>boolean</type>, <parameter>failover</parameter> <type>boolean</type> </optional> )
<returnvalue>record</returnvalue>
( <parameter>slot_name</parameter> <type>name</type>,
<parameter>lsn</parameter> <type>pg_lsn</type> )
@ -27722,8 +27722,13 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
released upon any error. The optional fourth parameter,
<parameter>twophase</parameter>, when set to true, specifies
that the decoding of prepared transactions is enabled for this
slot. A call to this function has the same effect as the replication
protocol command <literal>CREATE_REPLICATION_SLOT ... LOGICAL</literal>.
slot. The optional fifth parameter,
<parameter>failover</parameter>, when set to true,
specifies that this slot is enabled to be synced to the
standbys so that logical replication can be resumed after
failover. A call to this function has the same effect as
the replication protocol command
<literal>CREATE_REPLICATION_SLOT ... LOGICAL</literal>.
</para></entry>
</row>

10
doc/src/sgml/system-views.sgml
View File

@ -2555,6 +2555,16 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
</itemizedlist>
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>failover</structfield> <type>bool</type>
</para>
<para>
True if this is a logical slot enabled to be synced to the standbys.
Always false for physical slots.
</para></entry>
</row>
</tbody>
</tgroup>
</table>