Re: broken reading on standby (PostgreSQL 16.2)

čt 25. 4. 2024 v 8:52 odesílatel Andrey M. Borodin <x4mmm(at)yandex-team(dot)ru>
napsal:

>
>
> > On 25 Apr 2024, at 11:12, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> wrote:
> >
> > yesterday, I had to fix strange issue on standby server
>
> It’s not just broken reading, if this standby is promoted in HA cluster -
> this would lead to data loss.
> Recently I’ve observed some lost heap updates ofter OOM-ing cluster on
> 14.11. This might be unrelated most probably, but I’ll post a link here,
> just in case [0]. In February and March we had 3 clusters with similar
> problem, and this is unusually big number for us in just 2 months.
>
> Can you check LSN of blocks with corrupted tuples with pageinpsect on
> primary and on standby? I suspect they are frozen on primary, but have
> usual xmin on standby.
>

Unfortunately, I have not direct access to backup, so I am not able to test
it. But VACUUM FREEZE DISABLE_PAGE_SKIPPING on master didn't help

>
>
> Best regards, Andrey Borodin.
>
> [0]
> https://www.postgresql.org/message-id/flat/67EADE8F-AEA6-4B73-8E38-A69E5D48BAFE%40yandex-team.ru#1266dd8b898ba02686c2911e0a50ab47