Re: 035_standby_logical_decoding unbounded hang

On Fri, Feb 16, 2024 at 06:37:38AM +0000, Bertrand Drouvot wrote:
> On Thu, Feb 15, 2024 at 12:48:16PM -0800, Noah Misch wrote:
> > On Wed, Feb 14, 2024 at 03:31:16PM +0000, Bertrand Drouvot wrote:
> > > What about creating a sub, say wait_for_restart_lsn_calculation() in Cluster.pm
> > > and then make use of it in create_logical_slot_on_standby() and above? (something
> > > like wait_for_restart_lsn_calculation-v1.patch attached).
> >
> > Waiting for restart_lsn is just a prerequisite for calling
> > pg_log_standby_snapshot(), so I wouldn't separate those two.
>
> Yeah, makes sense.
>
> > If we're
> > extracting a sub, I would move the pg_log_standby_snapshot() call into the sub
> > and make the API like one of these:
> >
> > $standby->wait_for_subscription_starting_point($primary, $slot_name);
> > $primary->log_standby_snapshot($standby, $slot_name);
> >
> > Would you like to finish the patch in such a way?
>
> Sure, please find attached standby-slot-test-2-race-v2.patch doing so. I used
> log_standby_snapshot() as it seems more generic to me.

Thanks. Pushed at commit 0e16281.