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In-Reply-To: 
 <CAJpy0uBSY7zTH=4TvAOS=kj9vivBUc9NO+Vp6KNw-Na9RiAsMg@mail.gmail.com>
From: Dilip Kumar <dilipbalaut@gmail.com>
Date: Tue, 16 Jun 2026 18:54:09 +0530
Message-ID: 
 <CAFiTN-vqyo2=pgA_jUyQoWrOwUXxw1s3aYHcZBr_EHsztZN9jg@mail.gmail.com>
Subject: Re: Proposal: Conflict log history table for Logical Replication
To: shveta malik <shveta.malik@gmail.com>
Cc: Nisha Moond <nisha.moond412@gmail.com>, vignesh C <vignesh21@gmail.com>,
	Amit Kapila <amit.kapila16@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>
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 <https://www.postgresql.org/message-id/CAFiTN-vqyo2%3DpgA_jUyQoWrOwUXxw1s3aYHcZBr_EHsztZN9jg%40mail.gmail.com>
Precedence: bulk

On Mon, Jun 8, 2026 at 3:10=E2=80=AFPM shveta malik <shveta.malik@gmail.com=
> wrote:
>
> v46-0002:
>
> 1)
> I was trying to verify TRY-CATCH block of ProcessPendingConflictLogTuple(=
).
>
> When I force InsertConflictLogTuple() to fail while atatching
> debugger, I see a new error due to CATCH block. See this dump:
>
> -----------------
> [27532] WARNING:  could not log conflict to table for subscription
> "sub1": cannot open relation "pg_conflict_log_16391"
> [27532] ERROR:  errstart was not called
> [27102] LOG:  background worker "logical replication apply worker"
> (PID 27532) exited with exit code 1
> [27548] LOG:  logical replication apply worker for subscription "sub1"
> has started
> [27548] ERROR:  conflict detected on relation "public.tab1":
> conflict=3Dinsert_exists
> [27548] DETAIL:  Could not apply remote change: remote row (4).
>         Key already exists in unique index "tab1_pkey", modified in
> transaction 793: key (i)=3D(4), local row (4).
> [27548] CONTEXT:  processing remote data for replication origin "pg_16391=
...
> -----------------
>
> 'ERROR:  errstart was not called' is raised perhaps due to
> 'FlushErrorState' which sets errordata_stack_depth to -1. If I get rid
> of FlushErrorState(), the internal ERROR is not cleared, which results
> in the worker exiting (which we are trying to avoid).
>
> -------------------------
> [30031] WARNING:  could not log conflict to table for subscription
> "sub1": cannot open relation "pg_conflict_log_16391"
> [30031] ERROR:  cannot open relation "pg_conflict_log_16391"
> ------------->this needs to be handled.
> [30031] DETAIL:  This operation is not supported for tables.
> [30011] LOG:  background worker "logical replication apply worker"
> (PID 30031) exited with exit code 1
> [30043] LOG:  logical replication apply worker for subscription "sub1"
> has started
> [30043] ERROR:  conflict detected on relation "public.tab1":
> conflict=3Dinsert_exists
> [30043] DETAIL:  Could not apply remote change: remote row (12).
>         Key already exists in unique index "tab1_pkey", modified in
> transaction 872: key (i)=3D(12), local row (12).
> ------------------------
>
> I am still thinking how this can be done cleanly. Meanwhile putting it
> here for others to review/comment.

I am able to reproduce the error, I will put more thoughts and propose
the fix for this.

>
> 2)
> Also, I think InsertConflictLogTuple() in the non-error path (via
> ReportApplyConflict()) should be wrapped in its own TRY-CATCH block.
> When I force an error during that insert, execution falls through to
> the start_apply CATCH block, which then attempts to insert the same
> conflict record again via ProcessPendingConflictLogTuple(). That
> insert fails again for the same reason, causing the apply worker to
> error out.
>
> Should we keep this behavior and allow the apply worker to halt on a
> CLT insertion failure, or would it be better to avoid disrupting
> replication by encapsulating the insertion logic in its own TRY-CATCH
> block and handling the issue locally by emiting it as WaRNING?
> Thoughts?

IMHO we should just log WARNING and continue the apply worker on
conflict insertion failure, lets see what other thinks on this.


--=20
Regards,
Dilip Kumar
Google