Re: pg_receivewal starting position

On Sun, Oct 24, 2021 at 12:21 PM Michael Paquier <michael@paquier.xyz> wrote:
>
> On Sun, Oct 24, 2021 at 09:08:01AM +0530, Bharath Rupireddy wrote:
> > pg_get_replication_slots holds the ReplicationSlotControlLock until
> > the end of the function so it can be assured that *slot contents will
> > not change. In ReadReplicationSlot, the ReplicationSlotControlLock is
> > released immediately after taking *slot pointer into slot_contents.
> > Isn't it better if we hold the lock until the end of the function so
> > that we can avoid the slot contents becoming stale problems?
>
> The reason is different in the case of pg_get_replication_slots().  We
> have to hold ReplicationSlotControlLock for the whole duration of the
> shared memory scan to return back to the user a consistent set of
> information to the user, for all the slots.

Thanks. I've no further comments on the v10 patch.

Regards,
Bharath Rupireddy.