Date: Sun, 31 May 2026 21:11:07 +0000
To: JoongHyuk Shin <sjh910805@gmail.com>
From: Scott Ray <scott@scottray.io>
Cc: Fujii Masao <masao.fujii@gmail.com>,
 Michael Paquier <michael@paquier.xyz>, pgsql-hackers@lists.postgresql.org
Subject: Re: [PATCH] Don't call ereport(ERROR) from recovery target GUC assign
 hooks
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Thanks for the patch.  I've attached v1-0001 (atop v4) addressing the
UX and test-coverage items below.  Happy to rework or fold in however
you prefer.

1. There's a configuration trap in master and in this branch that
could be prevented using something very similar to
CheckRecoveryTargetConflicts to check pending GUCs:

    psql -c "ALTER SYSTEM SET recovery_target_xid TO '700'"
    psql -c "ALTER SYSTEM SET recovery_target_time TO '2026-01-01 00:00:00=
'"
    pg_ctl reload

The log shows:

    LOG:  received SIGHUP, reloading configuration files
    LOG:  parameter "recovery_target_xid" cannot be changed without restar=
ting the server
    LOG:  parameter "recovery_target_time" cannot be changed without resta=
rting the server
    LOG:  configuration file "postgresql.auto.conf" contains errors; unaff=
ected changes were applied

pg_settings shows:

    postgres=3D# SELECT name, setting, pending_restart FROM pg_settings
                WHERE name LIKE 'recovery_target%' AND pending_restart;
            name         | setting | pending_restart
    ---------------------+---------+-----------------
     recovery_target_time |         | t
     recovery_target_xid  |         | t

The db runs fine until the next restart, maybe hours later:

    FATAL:  multiple recovery targets specified
    DETAIL:  At most one of "recovery_target", "recovery_target_lsn",
    "recovery_target_name", "recovery_target_time",
    "recovery_target_xid" can be set.

Is it worth a follow-up to report the conflict early and loud?

2. There's an opportunity to provide a better UX by reporting which
flags were set and what the values were, so that the user doesn't have
to search config files or other logs to find this info.  For instance,
in the postgresql.auto.conf scenario above, instead of:

    DETAIL:  At most one of "recovery_target", "recovery_target_lsn",
    "recovery_target_name", "recovery_target_time",
    "recovery_target_xid" can be set.

The operator could see:

    DETAIL:  The following recovery target parameters are set:
    "recovery_target_time" =3D "2026-01-01 00:00:00",
    "recovery_target_xid" =3D "700".
    HINT:  At most one of "recovery_target", "recovery_target_lsn",
    "recovery_target_name", "recovery_target_time",
    "recovery_target_xid" can be set.

3. 003_recovery_targets.pl:339 currently tests recovery_target_xid's
cleared-then-set behavior.  The patch adds the same coverage for the
other four recovery_target_* GUCs.


--
Scott Ray

-----------------------a968328b26e0c0f3a1875aede36ac154
Content-Type: application/octet-stream; filename="v1-0001-Report-set-parameters-on-recovery_target-conflict.patch"; name="v1-0001-Report-set-parameters-on-recovery_target-conflict.patch"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="v1-0001-Report-set-parameters-on-recovery_target-conflict.patch"; name="v1-0001-Report-set-parameters-on-recovery_target-conflict.patch"

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