Re: tests against running server occasionally fail, postgres_fdw & tenk1

Hi,

On 2023-02-26 14:51:45 -0500, Tom Lane wrote:
> Andres Freund <andres(at)anarazel(dot)de> writes:
> > On 2022-12-08 16:15:11 -0800, Andres Freund wrote:
> >> The most frequent case is postgres_fdw, which somewhat regularly fails with a
> >> regression.diff like this:
> >> WHERE application_name = 'fdw_retry_check';
> >> pg_terminate_backend
> >> ----------------------
> >> - t
> >> -(1 row)
> >> +(0 rows)
>
> > Unless somebody comes up with a way to make the test more reliable pretty
> > soon, I think we should just remove it. It's one of the most frequently
> > flapping tests at the moment.
>
> If that's the only diff, we could just hide it, say by writing
>
> do $$ begin
> PERFORM pg_terminate_backend(pid, 180000) FROM pg_stat_activity
> WHERE application_name = 'fdw_retry_check';
> end $$;
>
> The actually important thing is the failure check after this;
> we don't care that much whether the initially-created connection
> is still live at this point.

Hm, yea, that should work. It's indeed the entirety of the diff
https://api.cirrus-ci.com/v1/artifact/task/4718859714822144/testrun/build/testrun/postgres_fdw-running/regress/regression.diffs

If we go that way we can remove the debug_discard muckery as well, I think?

Greetings,

Andres Freund