Re: [COMMITTERS] pgsql: Allow time delayed standbys and recovery

Thom Brown <thom@linux.com>

From: Thom Brown <thom@linux.com>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Magnus Hagander <magnus@hagander.net>, Simon Riggs <simon.riggs@enterprisedb.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-04-06T00:42:48Z
Lists: pgsql-hackers
On Tue, 5 Apr 2022 at 16:02, Robert Haas <robertmhaas@gmail.com> wrote:
>
> On Tue, Apr 5, 2022 at 10:58 AM Magnus Hagander <magnus@hagander.net> wrote:
> >> Makes sense. I will do this soon if nobody objects.
> >>
> >> I'm mildly uncomfortable with the phrase "WAL records generated over
> >> the delay period" because it seems a bit imprecise, but I'm not sure
> >> what would be better and I think the meaning is clear.
> >
> > Maybe "during" instead of "over"? But I'm not sure that's the part you're referring to?
>
> Yeah, something like that, maybe.

I share your discomfort with the wording.  How about:

WAL records must be kept on standby until they are ready to be applied.
Therefore, longer delays will result in a greater accumulation of WAL files,
increasing disk space requirements for the standby's <filename>pg_wal</>
directory.
-- 
Thom



Commits

  1. docs: Note the recovery_min_apply_delay bloats pg_wal.

  2. Allow time delayed standbys and recovery