Re: basebackup: do not verify checksums on pages written before enabling checksums

> On 15 Aug 2026, at 16:30, Zsolt Parragi <zsolt(dot)parragi(at)percona(dot)com> wrote:
>
>> Can we combine the two tests into a single 010_backup.pl to keep cluster
>> inits down?
>
> I reworked the tests with another injection point as part of this,
> this way they shouldn't be flaky on CI and they are significantly
> faster now.
>
>> I'm not sure that "since the server started" is enough for a backup taken from
>> a standby. XLogCtl is zeroed at startup, while the checksum state is restored
>> from pg_control. The standby can become available before replay reaches the
>> latest checksum transition, so verification could resume with
>> lastChecksumChangeRecPtr invalid.
>
> There was really an issue there, I think we can solve that by
> advancing minrecoverypoint. I kept a test case for this separate for
> now, as I am unsure if we want to include it in some form.
>
>> I think that an atomic would make more sense.
>
> Also done.

Thanks for the update! I am travelling today but will take a closer look
tomorrow evening when I am back again.

--
Daniel Gustafsson