Re: add log messages when replication slots become active and inactive (was Re: Is it worth adding ReplicationSlot active_pid to ReplicationSlotPersistentData?)

On Mon, Mar 27, 2023 at 11:08 AM Bharath Rupireddy
<bharath.rupireddyforpostgres@gmail.com> wrote:
>
> The v9 patch was failing because I was using MyReplicationSlot after
> it got reset by slot release, attached v10 patch fixes it.
>

+ *
+ * Note: use LogReplicationSlotAcquire() if needed, to log a message after
+ * acquiring the replication slot.
  */
 void
 ReplicationSlotAcquire(const char *name, bool nowait)
@@ -542,6 +554,9 @@ retry:

When does it need to be logged? For example, recently, we added one
more slot acquisition/release call in
binary_upgrade_logical_slot_has_caught_up(); it is not clear from the
comments whether we need to LOG it or not. I guess at some place like
atop LogReplicationSlotAcquire() we should document in a bit more
specific way as to when is this expected to be called.

--
With Regards,
Amit Kapila.