Re: Changing the state of data checksums in a running cluster

From: Tomas Vondra <tomas(at)vondra(dot)me>
To: Daniel Gustafsson <daniel(at)yesql(dot)se>
Cc: Andres Freund <andres(at)anarazel(dot)de>, Bernd Helmle <mailings(at)oopsware(dot)de>, Michael Paquier <michael(at)paquier(dot)xyz>, Michael Banck <mbanck(at)gmx(dot)net>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: Changing the state of data checksums in a running cluster
Date: 2026-03-15 22:59:04
Message-ID: d05fdb0e-d17e-49ba-b474-546c4493313b@vondra.me
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On 3/15/26 23:47, Tomas Vondra wrote:
> On 3/12/26 00:56, Daniel Gustafsson wrote:
>> ...
>>
>> * The change to XLOG_CHECKPOINT_REDO to move the wal_level into a proper record
>> structure should be pulled out as a 0001 patch as it's an cleanup that has
>> value on its own.
>
> Makes sense, but it's going to be harder because since d774072f0040 all
> 4 bits in XLR_INFO are used.
>

Correction. This is not a problem for the XLOG_CHECKPOINT_REDO patch,
but for adding XLOG_CHECKSUMS. I guess we'll need a second xlog rmgr.

regards

--
Tomas Vondra

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