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From: Tom Lane <tgl@sss.pgh.pa.us>
To: David G. Johnston <david.g.johnston@gmail.com>
Cc: Rui An <rueian.huang@gmail.com>
Cc: pgsql-bugs@postgresql.org <pgsql-bugs@postgresql.org>
Subject: Re: Many queries stuck for waiting MultiXactOffsetControlLock on PostgreSQL 9.6.1 replica
Date: Mon, 02 Aug 2021 10:18:46 -0400
Message-ID: <1625895.1627913926@sss.pgh.pa.us> (raw)
In-Reply-To: <CAKFQuwYJn8ZkLwiEfx27w4X4ONTg4-KF=YvQum-ZYaQwAj3OcA@mail.gmail.com>
References: <CABjTVMR39ci6LUVE2yWhpcufPee4nO3cu32sij3Yh8viksCztQ@mail.gmail.com>
	<CAKFQuwYJn8ZkLwiEfx27w4X4ONTg4-KF=YvQum-ZYaQwAj3OcA@mail.gmail.com>

"David G. Johnston" <david.g.johnston@gmail.com> writes:
> And you should also be prepared for the possibility that 9.6 is
> discontinued before there is a fix in which case you’d have to upgrade to
> v10 (at least) to get said fix.

If the fix is as complex as what's being discussed over at [1], there
is zero chance that it'd be back-patched at all.

Nonetheless, still being on 9.6.1 at this late date is next door to
software malpractice.  There are a *lot* of known bugs in that version
that have been fixed, including performance issues [2].

			regards, tom lane

[1] https://www.postgresql.org/message-id/flat/2BEC2B3F-9B61-4C1D-9FB5-5FAB0F05EF86%40yandex-team.ru
[2] https://www.postgresql.org/docs/release/





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