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

On Thu, Apr 4, 2024 at 4:35 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
>
> > Thanks for the changes. v34-0001 LGTM.
>
> I was doing a final review before pushing 0001 and found that
> 'inactive_since' could be set twice during startup after promotion,
> once while restoring slots and then via ShutDownSlotSync(). The reason
> is that ShutDownSlotSync() will be invoked in normal startup on
> primary though it won't do anything apart from setting inactive_since
> if we have synced slots. I think you need to check 'StandbyMode' in
> update_synced_slots_inactive_since() and return if the same is not
> set. We can't use 'InRecovery' flag as that will be set even during
> crash recovery.
>
> Can you please test this once unless you don't agree with the above theory?

Nice catch. I've verified that update_synced_slots_inactive_since is
called even for normal server startups/crash recovery. I've added a
check to exit if the StandbyMode isn't set.

Please find the attached v35 patch.

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