At Thu, 15 Dec 2022 09:23:12 +0530, Amit Kapila <amit.kapil...@gmail.com> wrote 
in 
> On Thu, Dec 15, 2022 at 7:16 AM Kyotaro Horiguchi
> <horikyota....@gmail.com> wrote:
> > Allowing walsender to finish ignoring replication status
> > wouldn't be great.
> >
> 
> Yes, that would be ideal. But do you know why that is a must?

I believe a graceful shutdown (fast and smart) of a replication set is expected 
to be in sync.  Of course we can change the policy to allow walsnder to stop 
before confirming all WAL have been applied. However walsender doesn't have an 
idea of  wheter the peer is intentionally delaying or not.

> >  One idea is to let logical workers send delaying
> > status.
> >
> 
> How can that help?

If logical worker notifies "I'm intentionally pausing replication for
now, so if you wan to shutting down, plese go ahead ignoring me",
publisher can legally run a (kind of) dirty shut down.

# It looks a bit too much, though..

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center


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