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In-Reply-To: <CAJpy0uCvQuC+x7OV6aUv5MWHcVMOqOdDcnCK5uN=d7VKthpY8A@mail.gmail.com>
From: Dilip Kumar <dilipbalaut@gmail.com>
Date: Fri, 30 Jan 2026 12:05:59 +0530
Message-ID: <CAFiTN-tCdoGKSDRsL+XUAMPQMa1QJ3gFqKgE30xp1uLKqwscOg@mail.gmail.com>
Subject: Re: Proposal: Conflict log history table for Logical Replication
To: shveta malik <shveta.malik@gmail.com>
Cc: Peter Smith <smithpb2250@gmail.com>, vignesh C <vignesh21@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>
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Precedence: bulk

On Thu, Jan 29, 2026 at 4:46=E2=80=AFPM shveta malik <shveta.malik@gmail.co=
m> wrote:
>
> Dilip, I was testing patch002, few observations:
>
> 1)
> remote_commit_ts is '2026-01-29 14:38:02.777599+05:30' while
> local_conflicts.commit_ts is of format
> '2026-01-29T14:37:35.805819+05:30' i.e. a 'T' to separate date and
> time in local-commit_ts case. IIUC, this is the expected (standard)
> way for timestamps to be in json-format. Can you please confirm?

Yes, I will check that and respond.

> 2)
> Differences between LOG and TABLE:
>
> a) In LOG, the column names are not included in the remote or local
> tuples, whereas in the TABLE, they are. For example:
>
> LOG: Could not apply remote change: remote row (2, 3, 4)
> TABLE: remote_tuple: {"a":2,"b":3,"c":4}
> b) remote_commit_ts is not recorded in LOG, but it is included in the TAB=
LE.
>
> IMO, both of these differences are okay as TABLE is expected to store
> (or can store) more detailed information. I=E2=80=99m just noting these h=
ere
> for others=E2=80=99 input. Let me know your thoughts.

Yeah, I think we do need additional data for table e.g. column name in
tuple so that users can use queries to extract value for specific
columns etc.

> 3)
> If we look at the table overall, the name 'local_conflicts' can be a
> bit misleading. This column actually stores the details about local
> rows involved in a conflict, rather than describing the conflict
> itself. See example below. A clearer name might be local_data,
> local_tuples_data, or local_tuples_detail. Thoughts?
>
> local_conflicts for one update_exists:
> {"{\"xid\":\"791\",\"commit_ts\":\"2026-01-29T14:37:35.805819+05:30\",\"o=
rigin\":null,\"key\":{\"i\":40},\"tuple\":{\"i\":40,\"j\":10}}"}

IMHO can we name it local_conflict_tuples?  Because remote tuples may
conflict with multiple local tuples, I think local_conflict_tuple
might be more relevant.  But OTOH we are storing other information as
well, not just tuples so maybe
local_tuples_detail/local_tuples_info/local_tuples_data make more
sense.  So maybe I am fine with 'local_tuples_detail' lets see if
there are any other thoughts?

> ~~
>
> patch002 works well in my testing done so far.
>
> thanks
> Shveta


--=20
Regards,
Dilip Kumar
Google