On Mon, Oct 12, 2020 at 10:59 AM Masahiko Sawada
<masahiko.sawada@2ndquadrant.com> wrote:
>
> On Thu, 8 Oct 2020 at 17:59, Amit Kapila <amit.kapila16@gmail.com> wrote:
> >
> > On Thu, Oct 8, 2020 at 1:55 PM Masahiko Sawada
> > <masahiko.sawada@2ndquadrant.com> wrote:
> > >
> > > On Thu, 8 Oct 2020 at 14:10, Amit Kapila <amit.kapila16@gmail.com> wrote:
> > > >
> > > >
> > > > We can write if we want but there are few things we need to do for
> > > > that like maybe a new function like wait_for_spill_stats which will
> > > > check if the counters have become zero. Then probably call a reset
> > > > function, call a new wait function, and then again check stats to
> > > > ensure they are reset to 0.
> > >
> > > Yes.
> > >
> >
> > I am not sure if it is worth but probably it is not a bad idea
> > especially if we extend the existing tests based on your below idea?
> >
> > > > We can't write any advanced test which means reset the existing stats
> > > > perform some tests and again check stats because *slot_get_changes()
> > > > function can start from the previous WAL for which we have covered the
> > > > stats. We might write that if we can somehow track the WAL positions
> > > > from the previous test. I am not sure if we want to go there.
> > >
> > > Can we use pg_logical_slot_peek_changes() instead to decode the same
> > > transactions multiple times?
> > >
> >
> > I think this will do the trick. If we want to go there then I suggest
> > we can have a separate regression test file in test_decoding with name
> > as decoding_stats, stats, or something like that. We can later add the
> > tests related to streaming stats in that file as well.
> >
>
> Agreed.
>
> I've updated the patch. Please review it.
>
Few comments:
=============
1.
+-- function to wait for counters to advance
+CREATE FUNCTION wait_for_spill_stats(check_reset bool) RETURNS void AS $$
Can we rename this function to wait_for_decode_stats? I am thinking we
can later reuse this function for streaming stats as well by passing
the additional parameter 'stream bool'.
2. let's drop the table added by this test and regression_slot at the
end of the test.
--
With Regards,
Amit Kapila.
