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From: vignesh C <vignesh21@gmail.com>
Date: Tue, 20 Jan 2026 18:48:22 +0530
Message-ID: <CALDaNm2YTKwPDjt9OV49RgM0zbkWhMhNu228bj_7f+zzcPb-ew@mail.gmail.com>
Subject: Re: Proposal: Conflict log history table for Logical Replication
To: Dilip Kumar <dilipbalaut@gmail.com>
Cc: Peter Smith <smithpb2250@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>, 
	shveta malik <shveta.malik@gmail.com>, Masahiko Sawada <sawada.mshk@gmail.com>, 
	Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>, 
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
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Precedence: bulk

On Mon, 19 Jan 2026 at 10:57, Dilip Kumar <dilipbalaut@gmail.com> wrote:
>
> On Mon, Jan 19, 2026 at 9:42=E2=80=AFAM Peter Smith <smithpb2250@gmail.co=
m> wrote:
> >
> > Some review comments for v22-0003.
> >
> > =3D=3D=3D=3D=3D=3D
> >
> > 1.
> > It looks like none of my previous v20-0003 review comments [1] have
> > been addressed. Maybe accidentally overlooked?
> >
> > =3D=3D=3D=3D=3D=3D
> >
> > 2.
> > +         <caution>
> > +          <para>
> > +           The internal conflict logging table is strictly tied to
> > the lifecycle of the
> > +           subscription or the
> > <literal>conflict_log_destination</literal> setting. If
> > +           the subscription is dropped, or if the destination is chang=
ed to
> > +           <literal>log</literal>, the table and all its recorded
> > conflict data are
> > +           <emphasis>permanently deleted</emphasis>. To perform a
> > post-mortem analysis
> > +           after removing a subscription, users must manually back up
> > or rename the
> > +           conflict table before the deletion occurs.
> > +          </para>
> > +         </caution>
> >
> > 2a.
> > Let's consistently call this the "Conflict log table", same as
> > everywhere else, not "logging table".
> >
> > ~
> >
> > 2b.
> > This is only a caution for the CLT, so I felt it's better to put this
> > in the scope of the 'table' param value.
> >
> > ~~~
> >
> > 3.
> > +             analysis of conflicts. This table is automatically
> > dropped when the
> > +             subscription is removed.
> >
> > If you move the <caution> to this scope, as suggested above in #2b,
> > then you can remove the sentence "This table is automatically dropped
> > when the subscription is removed", because that is duplicate
> > information you already wrote in the caution.
>
> The attached patch fixes above comments and other comments reported in
> v22-0001 and v22-0002

The tests are failing randomly at the following places
+# Wait for the conflict to be logged in the CLT
+my $log_check =3D $node_subscriber->poll_query_until(
+    'postgres',
+    "SELECT count(*) > 0 FROM $clt;"
+);
+
+my $conflict_check =3D $node_subscriber->safe_psql('postgres',
+    "SELECT count(*) FROM $clt WHERE conflict_type =3D
'multiple_unique_conflicts';");
+is($conflict_check, 1, 'Verified multiple_unique_conflicts logged
into conflict log table');


+# Wait for the conflict to be logged in the CLT
+$log_check =3D $node_subscriber->poll_query_until(
+    'postgres',
+    "SELECT count(*) > 0 FROM $clt;"
+);
+
+$conflict_check =3D $node_subscriber->safe_psql('postgres',
+    "SELECT count(*) FROM $clt WHERE conflict_type =3D
'multiple_unique_conflicts';");
+is($conflict_check, 1, 'Verified multiple_unique_conflicts logged
into conflict log table');


In both places it fails because the number of conflict records
inserted can be more than 1 like below:
[18:35:58.342](1.786s) not ok 1 - Verified multiple_unique_conflicts
logged into conflict log table
[18:35:58.346](0.004s)
[18:35:58.347](0.002s) #   Failed test 'Verified
multiple_unique_conflicts logged into conflict log table'
#   at t/035_conflicts.pl line 104.
[18:35:58.348](0.000s) #          got: '2'
#     expected: '1'

How about we check that the record count >=3D 1 and check for 't'.

Regards,
Vignesh