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In-Reply-To: 
 <CAJpy0uBKpXEkhBPLwSZDgunSODHJ9xdG=BZ9d7EAG+xVCH3M2Q@mail.gmail.com>
From: Dilip Kumar <dilipbalaut@gmail.com>
Date: Sun, 31 May 2026 12:27:48 +0530
Message-ID: 
 <CAFiTN-v9L7tGjQR2Hj_0GmXevnQUKSBAqhN+9nDYPD0QMbHvzQ@mail.gmail.com>
Subject: Re: Proposal: Conflict log history table for Logical Replication
To: shveta malik <shveta.malik@gmail.com>
Cc: vignesh C <vignesh21@gmail.com>, Nisha Moond <nisha.moond412@gmail.com>,
	Peter Smith <smithpb2250@gmail.com>, Amit Kapila <amit.kapila16@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-v9L7tGjQR2Hj_0GmXevnQUKSBAqhN%2B9nDYPD0QMbHvzQ%40mail.gmail.com>
Precedence: bulk

On Wed, May 27, 2026 at 4:08=E2=80=AFPM shveta malik <shveta.malik@gmail.co=
m> wrote:
>
> I have not yet looked at v41. Here are the comments for v40
>
> 0003 and 0004: No comments.
>
> 0004 and 0005:
>
>
> 1)
> In build_local_conflicts_json_array(), we have these:
>
> + json_datum =3D heap_copy_tuple_as_datum(tuple, tupdesc);
> +
> + /*
> + * Build the higher level JSON datum in format described in function
> + * header.
> + */
> + json_datum =3D DirectFunctionCall1(row_to_json, json_datum);
>
> We have first allocation to 'json_datum' via
> heap_copy_tuple_as_datum() and then second via row_to_json() call. So
> we are overwriting first allocation. Which memory context are we using
> here for this allocation? IIUC, if the conflict is non-error one, we
> may accumulate these memory chunks in long running worker loop which
> may gradually bloat the memory. Let me know if my undertstanding is
> wrong.
>
> Same situation in tuple_table_slot_to_indextup_json and
> tuple_table_slot_to_json_datum as well.

IIUC logical these all memory will be allocated under
ApplyMessageContext which is temporary and getting reset on every
logical message, so I think that contex is really for the purpose of
temporary allocation during each message processing and get reset
after the message is processed.

> 2)
> Same in ReportApplyConflict(), if elevel is not ERROR, should we worry
> about freeing 'err_detail' after error-reporting or does some
> short-lived context handle it?

Same is true for this as well.


--=20
Regards,
Dilip Kumar
Google