Horton

Re: Introduce XID age and inactive timeout based replication slot invalidation

Bertrand Drouvot <bertranddrouvot.pg@gmail.com>

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From: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
To: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Cc: Amit Kapila <amit.kapila16@gmail.com>, Nathan Bossart <nathandbossart@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2024-03-20T13:38:18Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Add a test for commit ac0e33136a using the injection point.

  2. Invalidate inactive replication slots.

  3. Fix incorrect slot type in BuildTupleHashTableExt

  4. Allow synced slots to have their inactive_since.

  5. Change last_inactive_time to inactive_since in pg_replication_slots.

  6. Track last_inactive_time in pg_replication_slots.

  7. Track invalidation_reason in pg_replication_slots.

  8. Add option force_initdb to PostgreSQL::Test::Cluster:init()

  9. Add a failover option to subscriptions.

  10. Allow setting failover property in the replication command.

  11. Allow to enable failover property for replication slots via SQL API.

  12. Track conflict_reason in pg_replication_slots.

  13. Log messages for replication slot acquisition and release.

  14. Remove vacuum_defer_cleanup_age

  15. Fix corruption due to vacuum_defer_cleanup_age underflowing 64bit xids

  16. meson: Add initial version of meson based build system

Hi,

On Wed, Mar 20, 2024 at 12:48:55AM +0530, Bharath Rupireddy wrote:
> On Mon, Mar 18, 2024 at 3:02 PM Bertrand Drouvot
> <bertranddrouvot.pg@gmail.com> wrote:
> >
> > > > Hm. Are you suggesting inactive_timeout to be a slot level parameter
> > > > similar to 'failover' property added recently by
> > > > c393308b69d229b664391ac583b9e07418d411b6 and
> > > > 73292404370c9900a96e2bebdc7144f7010339cf?
> > >
> > > Yeah, I have something like that in mind. You can prepare the patch
> > > but it would be good if others involved in this thread can also share
> > > their opinion.
> >
> > I think it makes sense to put the inactive_timeout granularity at the slot
> > level (as the activity could vary a lot say between one slot linked to a
> > subcription and one linked to some plugins). As far max_slot_xid_age I've the
> > feeling that a new GUC is good enough.
> 
> Well, here I'm implementing the above idea. The attached v12 patches
> majorly have the following changes:
> 

Regarding v12-0004: "Allow setting inactive_timeout in the replication command",
shouldn't we also add an new SQL API say: pg_alter_replication_slot() that would
allow to change the timeout property? 

That would allow users to alter this property without the need to make a
replication connection. 

But the issue is that it would make it inconsistent with the new inactivetimeout
in the subscription that is added in "v12-0005". But do we need to display
subinactivetimeout in pg_subscription (and even allow it at subscription creation
/ alter) after all? (I've the feeling there is less such a need as compare to
subfailover, subtwophasestate for example).

Regards,

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