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Allow walreceiver configuration to change on reload

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The parameters primary_conninfo, primary_slot_name and
wal_receiver_create_temp_slot can now be changed with a simple "reload"
signal, no longer requiring a server restart.  This is achieved by
signalling the walreceiver process to terminate and having it start
again with the new values.

Thanks to Andres Freund, Kyotaro Horiguchi, Fujii Masao for discussion.

Author: Sergei Kornilov <sk@zsrv.org>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/19513901543181143@sas1-19a94364928d.qloud-c.yandex.net
This commit is contained in:
Alvaro Herrera
2020-03-27 19:43:41 -03:00
parent 092c6936de
commit 1e6148032e
10 changed files with 179 additions and 68 deletions
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4
doc/src/sgml/high-availability.sgml
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@@ -816,8 +816,8 @@ archive_cleanup_command = 'pg_archivecleanup /path/to/archive %r'
When the standby is started and <varname>primary_conninfo</varname> is set
correctly, the standby will connect to the primary after replaying all
WAL files available in the archive. If the connection is established
successfully, you will see a walreceiver process in the standby, and
a corresponding walsender process in the primary.
successfully, you will see a <literal>walreceiver</literal> in the standby, and
a corresponding <literal>walsender</literal> process in the primary.
</para>
<sect3 id="streaming-replication-authentication">