Re: pgsql: Track last_inactive_time in pg_replication_slots.

Bertrand Drouvot <bertranddrouvot.pg@gmail.com>

From: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Amit Kapila <amit.kapila16@gmail.com>, shveta malik <shveta.malik@gmail.com>, Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>, Amit Kapila <akapila@postgresql.org>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2024-03-25T16:49:12Z
Lists: pgsql-hackers
Hi,

On Mon, Mar 25, 2024 at 12:25:37PM -0400, Robert Haas wrote:
> On Mon, Mar 25, 2024 at 12:12 PM Bertrand Drouvot
> <bertranddrouvot.pg@gmail.com> wrote:
> > Would "released_time" sounds better? (at the end this is exactly what it does
> > represent unless for the case where it is restored from disk for which the meaning
> > would still makes sense to me though). It seems to me that released_time does not
> > lead to any expectation then removing any confusion.
> 
> Yeah, that's not bad. I mean, I don't agree that released_time doesn't
> lead to any expectation,
> but what it leads me to expect is that you're
> going to tell me the time at which the slot was released. So if it's
> currently active, then I see NULL, because it's not released; but if
> it's inactive, then I see the time at which it became so.
> 
> In the same vein, I think deactivated_at or inactive_since might be
> good names to consider. I think they get at the same thing as
> released_time, but they avoid introducing a completely new word
> (release, as opposed to active/inactive).
> 

Yeah, I'd vote for inactive_since then.

Regards,

-- 
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com



Commits

  1. Allow synced slots to have their inactive_since.

  2. Change last_inactive_time to inactive_since in pg_replication_slots.

  3. Track last_inactive_time in pg_replication_slots.

  4. Remove vacuum_defer_cleanup_age