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From: Amit Kapila <amit.kapila16@gmail.com>
Date: Thu, 5 Sep 2024 09:25:51 +0530
Message-ID: <CAA4eK1JDRLTBHEEFv7asp_zhD1D79qCzYYLn1htfiXEo6NYkMA@mail.gmail.com>
Subject: Re: Introduce XID age and inactive timeout based replication slot invalidation
To: shveta malik <shveta.malik@gmail.com>
Cc: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>, 
	Peter Smith <smithpb2250@gmail.com>, Ajin Cherian <itsajin@gmail.com>, 
	Bertrand Drouvot <bertranddrouvot.pg@gmail.com>, Masahiko Sawada <sawada.mshk@gmail.com>, 
	Nathan Bossart <nathandbossart@gmail.com>, 
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
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Archived-At: <https://www.postgresql.org/message-id/CAA4eK1JDRLTBHEEFv7asp_zhD1D79qCzYYLn1htfiXEo6NYkMA%40mail.gmail.com>
Precedence: bulk

On Wed, Sep 4, 2024 at 2:49=E2=80=AFPM shveta malik <shveta.malik@gmail.com=
> wrote:
>
> On Wed, Sep 4, 2024 at 9:17=E2=80=AFAM shveta malik <shveta.malik@gmail.c=
om> wrote:
> >
> > On Tue, Sep 3, 2024 at 3:01=E2=80=AFPM shveta malik <shveta.malik@gmail=
.com> wrote:
> > >
> > >
>
>
> 1)
> It is related to one of my previous comments (pt 3 in [1]) where I
> stated that inactive_since should not keep on changing once a slot is
> invalidated.
>

Agreed. Updating the inactive_since for a slot that is already invalid
is misleading.

>
>
> 2)
> One more issue in this message is, once I set
> replication_slot_inactive_timeout to a bigger value, it becomes more
> misleading. This is because invalidation was done in the past using
> previous value while message starts showing new value:
>
> ALTER SYSTEM SET replication_slot_inactive_timeout TO '36h';
>
> --see 129600 secs in DETAIL and the current time.
> postgres=3D# SELECT * FROM pg_replication_slot_advance('mysubnew1_1',
> pg_current_wal_lsn());
> ERROR:  can no longer get changes from replication slot "mysubnew1_1"
> DETAIL:  The slot became invalid because it was inactive since
> 2024-09-04 10:06:38.980939+05:30, which is more than 129600 seconds
> ago.
> postgres=3D# select now();
>                now
> ----------------------------------
>  2024-09-04 10:07:35.201894+05:30
>
> I feel we should change this message itself.
>

+1.

--=20
With Regards,
Amit Kapila.