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Rename standby_slot_names to synchronized_standby_slots.

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The standby_slot_names GUC allows the specification of physical standby
slots that must be synchronized before the logical walsenders associated
with logical failover slots. However, for this purpose, the GUC name is
too generic.

Author: Hou Zhijie
Reviewed-by: Bertrand Drouvot, Masahiko Sawada
Backpatch-through: 17
Discussion: https://postgr.es/m/ZnWeUgdHong93fQN@momjian.us
This commit is contained in:
Amit Kapila
2024-07-01 11:36:56 +05:30
parent 0c3930d076
commit 2357c9223b
14 changed files with 115 additions and 112 deletions
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8
doc/src/sgml/logicaldecoding.sgml
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@@ -385,16 +385,16 @@ postgres=# select * from pg_logical_slot_get_changes('regression_slot', NULL, NU
<literal>dbname</literal> in the
<link linkend="guc-primary-conninfo"><varname>primary_conninfo</varname></link>.
It's highly recommended that the said physical replication slot is named in
<link linkend="guc-standby-slot-names"><varname>standby_slot_names</varname></link>
<link linkend="guc-synchronized-standby-slots"><varname>synchronized_standby_slots</varname></link>
list on the primary, to prevent the subscriber from consuming changes
faster than the hot standby. Even when correctly configured, some latency
is expected when sending changes to logical subscribers due to the waiting
on slots named in
<link linkend="guc-standby-slot-names"><varname>standby_slot_names</varname></link>.
When <varname>standby_slot_names</varname> is utilized, the
<link linkend="guc-synchronized-standby-slots"><varname>synchronized_standby_slots</varname></link>.
When <varname>synchronized_standby_slots</varname> is utilized, the
primary server will not completely shut down until the corresponding
standbys, associated with the physical replication slots specified
in <varname>standby_slot_names</varname>, have confirmed
in <varname>synchronized_standby_slots</varname>, have confirmed
receiving the WAL up to the latest flushed position on the primary server.
</para>