Re: [HACKERS] Timing-sensitive case in src/test/recovery TAP tests

On Mon, Jun 26, 2017 at 10:48 AM, Craig Ringer <craig@2ndquadrant.com> wrote:
> $node_standby_1->poll_query_until('postgres', q[SELECT xmin IS NULL
> from pg_replication_slots WHERE slot_name = '] . $slotname_2 . q[']);

+1 for avoiding a sleep call if it is not necessary. Fast platforms
would always pay a cost on that, and slow platforms would wait 1s (or
more!) when polling for the result.

Could it be possible to remove as well the second sleep(2) call in
this test please? This could be replaced by a similar poll using the
query Craig has just given as this needs to wait until the xmon is
cleared. Other tests expect a value so this poll cannot happen in
get_slot_xmins.
-- 
Michael