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 <CAOzEurRV117N2neo1N_O+xWPv=-R7qou+i7k-h79JjTP9sO1Fg@mail.gmail.com>
From: Fujii Masao <masao.fujii@gmail.com>
Date: Fri, 20 Mar 2026 02:13:25 +0900
Message-ID: 
 <CAHGQGwGLUXmjC1+A1fzg-ynP1pdKC-0yfmLYcnnu4YJSEDnuQw@mail.gmail.com>
Subject: Re: pg_stat_replication.*_lag sometimes shows NULL during active
 replication
To: Shinya Kato <shinya11.kato@gmail.com>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Content-Type: multipart/mixed; boundary="0000000000007b2564064d63b03a"
Archived-At: 
 <https://www.postgresql.org/message-id/CAHGQGwGLUXmjC1%2BA1fzg-ynP1pdKC-0yfmLYcnnu4YJSEDnuQw%40mail.gmail.com>
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--0000000000007b2564064d63b03a
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

On Thu, Mar 19, 2026 at 10:58=E2=80=AFPM Shinya Kato <shinya11.kato@gmail.c=
om> wrote:
>
> On Tue, Mar 17, 2026 at 11:00=E2=80=AFAM Fujii Masao <masao.fujii@gmail.c=
om> wrote:
> >
> > On Mon, Mar 16, 2026 at 9:26=E2=80=AFAM Shinya Kato <shinya11.kato@gmai=
l.com> wrote:
> > > Thank you for the v4 patch. I think this approach is better than mine=
.
> > > I tested the patch and confirmed that the issue no longer reproduces
> > > with physical replication. However, with logical replication, the lag
> > > columns in pg_stat_replication still show NULL periodically at
> > > wal_receiver_status_interval, since send_feedback() in worker.c can
> > > still send duplicate positions.
> >
> > I was thinking that if a feedback message triggered by
> > wal_receiver_status_interval has the same LSNs as the previous message,
> > it's expected for the lag columns to become NULL. But you see it differ=
ently,
> > don't you? Sorry, I failed to understand your point...
>
> Sorry for the confusion. I ran a script inserting one row every 0.5
> seconds under logical replication and confirmed that NULL still
> appears in the lag columns even while replication is actively running.
> I was initially mistaken that this was tied to
> wal_receiver_status_interval timing =E2=80=94 that turned out to be unrel=
ated.
>
> I haven't had time to investigate further, but my current impression
> is that the existing approach may not be sufficient for logical
> replication.

Thanks for the clarification! I understand your point now.

I think the issue occurs when the positions in the first message point to
the same LSN (e.g., 0/030D5230), and the second message reports the same bu=
t
larger LSN (e.g., 0/030D52E0).

I've updated the patch to address this. It removes fullyAppliedLastTime,
tracks the positions from the previous reply, and clears the lag values onl=
y
when the positions remain unchanged across two consecutive messages.

Patch attached. Could you test and review this updated patch?

Regards,

--=20
Fujii Masao

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