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In-Reply-To: 
 <CAFiTN-t04zWHek+LuB5uF1hY9+6B-x_nuL8AhwHkFCYv64iOaA@mail.gmail.com>
From: Amit Kapila <amit.kapila16@gmail.com>
Date: Fri, 29 May 2026 11:47:49 -0700
Message-ID: 
 <CAA4eK1KDc3vfVsbo_yLZtmMFY84j4QaVT9vHetYL-TQ=+_536Q@mail.gmail.com>
Subject: Re: Proposal: Conflict log history table for Logical Replication
To: Dilip Kumar <dilipbalaut@gmail.com>
Cc: vignesh C <vignesh21@gmail.com>, shveta malik <shveta.malik@gmail.com>,
	Nisha Moond <nisha.moond412@gmail.com>, Peter Smith <smithpb2250@gmail.com>,
	Masahiko Sawada <sawada.mshk@gmail.com>,
	Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
 shveta malik <shvetamalik@gmail.com>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Archived-At: 
 <https://www.postgresql.org/message-id/CAA4eK1KDc3vfVsbo_yLZtmMFY84j4QaVT9vHetYL-TQ%3D%2B_536Q%40mail.gmail.com>
Precedence: bulk

On Fri, May 29, 2026 at 2:23=E2=80=AFAM Dilip Kumar <dilipbalaut@gmail.com>=
 wrote:
>
> On Thu, May 28, 2026 at 2:57=E2=80=AFAM Amit Kapila <amit.kapila16@gmail.=
com> wrote:
>
>   I think I am facing a
> > related problem w.r.t newly created subscription. After applying first
> > six patches, the create subscription fails as follows:
> > postgres=3D# create subscription sub1 connection 'dbname=3Dpostgres'
> > publication pub1 with (conflict_log_destination=3D'all');
> > ERROR:  dependent subscription was concurrently dropped
> >
> > I debugged and found that we get the above ERROR when we are trying to
> > find the subscription which is not yet created. In this case, it seems
> > to be happening because we are using a subscription that is yet not
> > created for dependency recording. This raises a question as to why are
> > we creating the conflict_log_table before subscription, at least this
> > needs some comments.
>
> This error occurs because in the commit below [1], we disallowed
> recording a dependency on an object that does not exist. Therefore, we
> now need to record the dependency after the subscription is created.
>

But don't we normally create dependency immediately after creating the
object? Do you see such examples at other places in the code?

> And we create CLT before so that we can add the conflict log relid in
> pg_subscription without an additional update,
>

But will this additional update matter to an extent in DDL execution
that we don't follow our usual way to record dependency? I feel unless
we follow similar coding pattern at other places, it is better to
create the CLT after subscription.

--=20
With Regards,
Amit Kapila.