Re: Introduce XID age and inactive timeout based replication slot invalidation

From: Nisha Moond <nisha(dot)moond412(at)gmail(dot)com>
To: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
Cc: "Zhijie Hou (Fujitsu)" <houzj(dot)fnst(at)fujitsu(dot)com>, Nathan Bossart <nathandbossart(at)gmail(dot)com>, Álvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Peter Smith <smithpb2250(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Shlok Kyal <shlok(dot)kyal(dot)oss(at)gmail(dot)com>, "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>, shveta malik <shveta(dot)malik(at)gmail(dot)com>, Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, Ajin Cherian <itsajin(at)gmail(dot)com>, Bertrand Drouvot <bertranddrouvot(dot)pg(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: Introduce XID age and inactive timeout based replication slot invalidation
Date: 2025-02-17 06:20:41
Message-ID: CABdArM7v0N0Kz1x0HjnuJZgDC8e=ZGgfCgSywsm4imgmpWghDA@mail.gmail.com
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On Mon, Feb 17, 2025 at 11:29 AM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>
> On Fri, Feb 14, 2025 at 5:30 PM Nisha Moond <nisha(dot)moond412(at)gmail(dot)com> wrote:
> >
> > Here is a summary of changes in v78:
> >
>
> A few minor comments:
> 1.
> Slots that appear idle due to a disrupted connection between
> + the publisher and subscriber are also excluded, as they are managed by
> + <link linkend="guc-wal-sender-timeout"><varname>wal_sender_timeout</varname></link>.
> ...
>
> How do we exclude the above kind of slots? I think it is trying to
> cover the case where walsender is not exited even after the connection
> is broken between publisher and subscriber. The point is quite
> confusing and adds much less value. So, we can remove it.
>
> 2.
> - * Returns true when any slot have got invalidated.
> + * Returns true if there are any invalidated slots.
> ...
>
> I find the existing comment more suitable for this function and easy to follow.
>
> Apart from the above, I have changed a few other comments and minor
> cosmetic cleanup.
>

Here are the v79 patches with the above changes and comments from [1]
incorporated.

[1] https://www.postgresql.org/message-id/CAHut%2BPutqw%3D79SPh%2BEJZoS%2B98cJJvRRBmp-v6zqSRwngHey_ow%40mail.gmail.com

--
Thanks,
Nisha

Attachment Content-Type Size
v79-0001-Introduce-inactive_timeout-based-replication-slo.patch application/octet-stream 33.5 KB
v79-0002-Add-TAP-test-for-slot-invalidation-based-on-inac.patch application/octet-stream 6.4 KB

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