Re: Add index scan progress to pg_stat_progress_vacuum

On Tue, Mar 22, 2022 at 4:27 PM Imseih (AWS), Sami <simseih@amazon.com> wrote:
>
> >    BTW have we discussed another idea I mentioned before that we have the
> >    leader process periodically check the number of completed indexes and
> >    advertise it in its progress information? I'm not sure which one is
> >    better but this idea would require only changes of vacuum code and
> >    probably simpler than the current idea.
>
> >    Regards,
>
>
> If I understand correctly,  to accomplish this we will need to have the leader
> check the number of indexes completed In the ambukdelete or amvacuumcleanup
> callbacks. These routines do not know about  PVIndStats, and they are called
> by both parallel and non-parallel vacuums.
>
> From what I can see, PVIndstats will need to be passed down to these routines
> or pass a NULL for non-parallel vacuums.
>

Can the leader pass a callback that checks PVIndStats to ambulkdelete
an amvacuumcleanup callbacks? I think that in the passed callback, the
leader checks if the number of processed indexes and updates its
progress information if the current progress needs to be updated.

Regards,

-- 
Masahiko Sawada
EDB:  https://www.enterprisedb.com/