From f789c2e71e99a4e3be550e7c0cf3fba68b5bf277 Mon Sep 17 00:00:00 2001
From: Fujii Masao <fujii@postgresql.org>
Date: Thu, 23 Oct 2025 16:42:37 +0900
Subject: [PATCH v4 1/2] Make GUC wal_receiver_timeout user-settable.

When multiple subscribers connect to different publisher servers,
it can be useful to set different wal_receiver_timeout values for
each connection to better detect failures. However, previously
this wasn't possible, which limited flexibility in managing subscriptions.

This commit changes wal_receiver_timeout to be user-settable,
allowing different values to be assigned using ALTER ROLE SET for
each subscription owner. This effectively enables per-subscription
configuration.
---
 doc/src/sgml/config.sgml                  | 3 ---
 src/backend/utils/misc/guc_parameters.dat | 2 +-
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 5560b95ee60..336a68fba57 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -5181,9 +5181,6 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class="
         If this value is specified without units, it is taken as milliseconds.
         The default value is 60 seconds.
         A value of zero disables the timeout mechanism.
-        This parameter can only be set in
-        the <filename>postgresql.conf</filename> file or on the server
-        command line.
        </para>
       </listitem>
      </varlistentry>
diff --git a/src/backend/utils/misc/guc_parameters.dat b/src/backend/utils/misc/guc_parameters.dat
index f0260e6e412..021f5206188 100644
--- a/src/backend/utils/misc/guc_parameters.dat
+++ b/src/backend/utils/misc/guc_parameters.dat
@@ -3394,7 +3394,7 @@
   max => 'INT_MAX / 1000',
 },
 
-{ name => 'wal_receiver_timeout', type => 'int', context => 'PGC_SIGHUP', group => 'REPLICATION_STANDBY',
+{ name => 'wal_receiver_timeout', type => 'int', context => 'PGC_USERSET', group => 'REPLICATION_STANDBY',
   short_desc => 'Sets the maximum wait time to receive data from the sending server.',
   long_desc => '0 disables the timeout.',
   flags => 'GUC_UNIT_MS',
-- 
2.51.2