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: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, Amit Kapila <amit.kapila16@gmail.com>, "Zhijie Hou (Fujitsu)" <houzj.fnst@fujitsu.com>, shveta malik <shveta.malik@gmail.com>
Date: 2024-02-22T08:14:57Z
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, Feb 21, 2024 at 08:10:00PM +0530, Bharath Rupireddy wrote:
> On Wed, Feb 21, 2024 at 5:55 PM Bertrand Drouvot
> <bertranddrouvot.pg@gmail.com> wrote:
> > My initial thought was to put "conflict" value in this new field in case of
> > conflict (not to mention the conflict reason in it). With the current proposal
> > invalidation_reason could report the same as conflict_reason, which sounds weird
> > to me.
> >
> > Does that make sense to you to use "conflict" as value in "invalidation_reason"
> > when the slot has "conflict_reason" not NULL?
> 
> I'm thinking the other way around - how about we revert
> https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=007693f2a3ac2ac19affcb03ad43cdb36ccff5b5,
> that is, put in place "conflict" as a boolean and introduce
> invalidation_reason the text form. So, for logical slots, whenever the
> "conflict" column is true, the reason is found in invaldiation_reason
> column? How does it sound?

Yeah, I think that looks fine too. We would need more change (like take care of
ddd5f4f54a for example).

CC'ing Amit, Hou-San and Shveta to get their point of view (as the ones behind
007693f2a3 and ddd5f4f54a).

Regarding,

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