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In-Reply-To: 
 <CAA4eK1+h=QV4Zi=PW8Zt2D6be5ki5Mu2HgdXcfUophptx6Mt_A@mail.gmail.com>
From: Dilip Kumar <dilipbalaut@gmail.com>
Date: Sat, 30 May 2026 03:24:39 +0530
Message-ID: 
 <CAFiTN-s-tuxar9Dp5He0CFa1pzfy1fmiwcBj6PtwD0hDodE5ng@mail.gmail.com>
Subject: Re: Proposal: Conflict log history table for Logical Replication
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: Nisha Moond <nisha.moond412@gmail.com>, vignesh C <vignesh21@gmail.com>,
	Peter Smith <smithpb2250@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>,
 shveta malik <shvetamalik@gmail.com>
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 <https://www.postgresql.org/message-id/CAFiTN-s-tuxar9Dp5He0CFa1pzfy1fmiwcBj6PtwD0hDodE5ng%40mail.gmail.com>
Precedence: bulk

On Fri, May 29, 2026 at 5:11=E2=80=AFAM Amit Kapila <amit.kapila16@gmail.co=
m> wrote:
>
> On Thu, May 21, 2026 at 9:51=E2=80=AFPM Nisha Moond <nisha.moond412@gmail=
.com> wrote:
> >
> > On Wed, May 20, 2026 at 3:05=E2=80=AFPM vignesh C <vignesh21@gmail.com>=
 wrote:
> > >
> > > Rest of the comments were fixed.
> > > The attached v37 version patch has the changes for the same. Also
> > > Peter's comments on the documentation patch from [1] and Shveta's
> > > comments from [2] are addressed in the attached patch.
> > >
> >
> > Here are few comments based on v37 testing:
> >
> > 1) Should we consider using TOAST tables for tuple-data columns like
> > remote_tuple and local_conflicts (the JSON columns)?
> > This may be a corner case, but if the tuple data becomes too large to
> > fit into an 8KB heap tuple, then the apply worker keeps failing while
> > inserting into the CLT with errors like:
> >
> >   ERROR: row is too big: size 19496, maximum size 8160
> >   LOG: background worker "logical replication apply worker" (PID
> > 41226) exited with exit code 1
> >
>
> In the docs, it is mentioned: "column_value is the column value. The
> large column values are truncated to 64 bytes." [1], so I wonder, if
> we follow this why we need toast entries? Did you tried any case where
> you are getting above ERROR?

But in this case we are talking about the JSON column of the CLT which
might contain a full local tuple or even multiple local tuples if a
remote tuple conflicts with multiple local rows.  So, IMHO, we need a
toast table. Nisha, have you already tested the scenario? If yes, can
you share your test case?


--=20
Regards,
Dilip Kumar
Google