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

Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>

From: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>

To: shveta malik <shveta.malik@gmail.com>

Cc: Amit Kapila <amit.kapila16@gmail.com>, Bertrand Drouvot <bertranddrouvot.pg@gmail.com>, Nathan Bossart <nathandbossart@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>

Date: 2024-03-27T04:56:01Z

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 →

Add a test for commit ac0e33136a using the injection point.
- 8a695d7998be 18.0 landed
Invalidate inactive replication slots.
- ac0e33136abc 18.0 landed
Fix incorrect slot type in BuildTupleHashTableExt
- d96d1d5152f3 18.0 cited
Allow synced slots to have their inactive_since.
- 6f132ed693b6 17.0 landed
Change last_inactive_time to inactive_since in pg_replication_slots.
- 6d49c8d4b4f4 17.0 landed
Track last_inactive_time in pg_replication_slots.
- a11f330b5584 17.0 landed
Track invalidation_reason in pg_replication_slots.
- 6ae701b4378d 17.0 landed
Add option force_initdb to PostgreSQL::Test::Cluster:init()
- ff9e1e764fcc 17.0 cited
Add a failover option to subscriptions.
- 776621a5e479 17.0 cited
Allow setting failover property in the replication command.
- 73292404370c 17.0 cited
Allow to enable failover property for replication slots via SQL API.
- c393308b69d2 17.0 cited
Track conflict_reason in pg_replication_slots.
- 007693f2a3ac 17.0 cited
Log messages for replication slot acquisition and release.
- 7c3fb505b14e 17.0 cited
Remove vacuum_defer_cleanup_age
- 1118cd37eb61 16.0 cited
Fix corruption due to vacuum_defer_cleanup_age underflowing 64bit xids
- be504a3e974d 16.0 cited
meson: Add initial version of meson based build system
- e6927270cd18 16.0 cited

On Wed, Mar 27, 2024 at 10:24 AM shveta malik <shveta.malik@gmail.com> wrote:
>
> On Wed, Mar 27, 2024 at 10:22 AM Amit Kapila <amit.kapila16@gmail.com> wrote:
> >
> > On Wed, Mar 27, 2024 at 10:08 AM Bharath Rupireddy
> > <bharath.rupireddyforpostgres@gmail.com> wrote:
> > >
> > > On Tue, Mar 26, 2024 at 11:22 PM Bertrand Drouvot
> > > <bertranddrouvot.pg@gmail.com> wrote:
> > >
> > > > 3)
> > > > update_synced_slots_inactive_time():
> > > >
> > > > This assert is removed, is it intentional?
> > > > Assert(s->active_pid == 0);
> > >
> > > Yes, the slot can get acquired in the corner case when someone runs
> > > pg_sync_replication_slots concurrently at this time. I'm referring to
> > > the issue reported upthread. We don't prevent one running
> > > pg_sync_replication_slots in promotion/ShutDownSlotSync phase right?
> > > Maybe we should prevent that otherwise some of the slots are synced
> > > and the standby gets promoted while others are yet-to-be-synced.
> > >
> >
> > We should do something about it but that shouldn't be done in this
> > patch. We can handle it separately and then add such an assert.
>
> Agreed. Once this patch is concluded, I can fix the slot sync shutdown
> issue and will also add this 'assert' back.

Agreed. Thanks.

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