Horton

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

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Cc: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>, Nathan Bossart <nathandbossart@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2024-03-20T03:28:05Z
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

On Wed, Mar 20, 2024 at 12:49 AM Bharath Rupireddy
<bharath.rupireddyforpostgres@gmail.com> wrote:
>
>
> Following are some open points:
>
> 1. Where to do inactive_timeout invalidation exactly if not the checkpointer.
>

I have suggested to do it at the time of CheckpointReplicationSlots()
and Bertrand suggested to do it whenever we resume using the slot. I
think we should follow both the suggestions.

> 2. Where to do XID age invalidation exactly if not the checkpointer.
> 3. How to go about recomputing XID horizons based on max_slot_xid_age.
> Does the slot's horizon's need to be adjusted in ComputeXidHorizons()?
>

I suggest postponing the patch for xid based invalidation for a later
discussion.

> 4. New invalidation mechanisms interaction with slot sync feature.
>

Yeah, this is important. My initial thoughts are that synced slots
shouldn't be invalidated on the standby due to timeout.

> 5. Review comments on 0001 from Bertrand.
>
> Please see the attached v12 patches.
>

Thanks for quickly updating the patches.

-- 
With Regards,
Amit Kapila.