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

I apologize that I haven't been able to keep up with this thread for a
while, but I'm happy to see the continued interest in $SUBJECT.

On Sun, Mar 24, 2024 at 03:05:44PM +0530, Bharath Rupireddy wrote:
> This commit particularly lets one specify the inactive_timeout for
> a slot via SQL functions pg_create_physical_replication_slot and
> pg_create_logical_replication_slot.

Off-list, Bharath brought to my attention that the current proposal was to
set the timeout at the slot level.  While I think that is an entirely
reasonable thing to support, the main use-case I have in mind for this
feature is for an administrator that wants to prevent inactive slots from
causing problems (e.g., transaction ID wraparound) on a server or a number
of servers.  For that use-case, I think a GUC would be much more
convenient.  Perhaps there could be a default inactive slot timeout GUC
that would be used in the absence of a slot-level setting.  Thoughts?

-- 
Nathan Bossart
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