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From: Fujii Masao <masao.fujii@gmail.com>
Date: Thu, 26 Mar 2026 00:30:42 +0900
Message-ID: 
 <CAHGQGwHLK5ObQShRx15OwBK4whO7MQ0VXveBtxDsMiibGUGK_g@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="00000000000034038a064ddaf434"
Archived-At: 
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Precedence: bulk

--00000000000034038a064ddaf434
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Content-Transfer-Encoding: quoted-printable

On Wed, Mar 25, 2026 at 4:03=E2=80=AFPM Shinya Kato <shinya11.kato@gmail.co=
m> wrote:
> Thanks for the updated patch. LGTM.
>
> Regarding the backpatch, I'd personally appreciate it if the walsender.c =
changes were backpatched to stable branches. As you noted, it don't fully s=
olve the reported issue, but they do help reduce the cases where lag column=
s in pg_stat_replication unexpectedly become NULL.
>
> Even a partial mitigation in the back branches would be valuable for user=
s running stable releases.

+1

I've split the changes into two patches.

Patch 0001 fixes premature NULL lag reporting in walsender. I will commit i=
t
and backpatch it to all supported branches.

Patch 0002 avoids sending duplicate WAL locations in standby status replies=
.
I will commit this to master only.

Regards,

--=20
Fujii Masao

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