From: | Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com> |
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To: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
Cc: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Melanie Plageman <melanieplageman(at)gmail(dot)com> |
Subject: | Re: Is there a way (except from server logs) to know the kind of on-going/last checkpoint? |
Date: | 2021-12-08 01:54:41 |
Message-ID: | CALj2ACX1vrk_hNZaib7rn9vtpFL6Yyor8Y5QUOO_EHZNpTtFyA@mail.gmail.com |
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On Wed, Dec 8, 2021 at 4:07 AM Justin Pryzby <pryzby(at)telsasoft(dot)com> wrote:
> > I'd bet squashing all of this into a single string (not really a flag)
> > will just mean people will have to parse it, etc. Keeping individual
> > boolean flags (or even separate string fields) would be better, I guess.
>
> Since the size of controldata is a concern, I suggest to add an int16 to
> populate with flags, which pg_controldata can parse for display.
+1. I will come up with a patch soon.
> Note that this other patch intends to add the timestamp and LSN of most recent
> recovery to controldata.
> https://commitfest.postgresql.org/36/3183/
Thanks. I will go through it separately.
> > We already have some checkpoint info in pg_stat_bgwriter, but that's
> > just aggregated data, not very convenient for info about the current
> > checkpoint. So maybe we should add pg_stat_progress_checkpoint, showing
> > various info about the current checkpoint?
>
> It could go into the pg_stat_checkpointer view, which would be the culmination
> of another patch (cc Melanie).
> https://commitfest.postgresql.org/36/3272/
+1 to have pg_stat_progress_checkpoint view. We have
CheckpointStatsData already. What we need is to make this structure
shared and add a little more info to represent the progress, so that
the other backends can access it. I think we can discuss this in a
separate thread to give it a fresh try rather than proposing this as a
part of another thread. I will spend some time on
pg_stat_progress_checkpoint proposal and try to come up with a
separate thread to discuss.
Regards,
Bharath Rupireddy.
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