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

Hi,

On Tue, Mar 26, 2024 at 02:27:17PM +0530, Bharath Rupireddy wrote:
> Please use the v22 patch set.

Thanks!

1 ===

+reset_synced_slots_info(void)

I'm not sure "reset" is the right word, what about slot_sync_shutdown_update()?

2 ===

+       for (int i = 0; i < max_replication_slots; i++)
+       {
+               ReplicationSlot *s = &ReplicationSlotCtl->replication_slots[i];
+
+               /* Check if it is a synchronized slot */
+               if (s->in_use && s->data.synced)
+               {
+                       TimestampTz now;
+
+                       Assert(SlotIsLogical(s));
+                       Assert(s->active_pid == 0);
+
+                       /*
+                        * Set the time since the slot has become inactive after shutting
+                        * down slot sync machinery. This helps correctly interpret the
+                        * time if the standby gets promoted without a restart. We get the
+                        * current time beforehand to avoid a system call while holding
+                        * the lock.
+                        */
+                       now = GetCurrentTimestamp();

What about moving "now = GetCurrentTimestamp()" outside of the for loop? (it
would be less costly and probably good enough).

Regards,

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