Re: xid_wraparound tests intermittent failure.

See <https://bitbucket.org/adunstan/rotfang-fdw/downloads/xid-wraparound-result.tar.bz2>


The failure logs are from a run where both tests 1 and 2 failed.

Thank you for sharing the logs.

I think that the problem seems to match what Alexander Lakhin
mentioned[1]. Probably we can fix such a race condition somehow but
I'm not sure it's worth it as setting autovacuum = off and
autovacuum_max_workers = 1 (or a low number) is an extremely rare
case. I think it would be better to stabilize these tests. One idea is
to turn the autovacuum GUC parameter on while setting
autovacuum_enabled = off for each table. That way, we can ensure that
autovacuum workers are launched. And I think it seems to align real
use cases.

Regards,

[1] https://www.postgresql.org/message-id/02373ec3-50c6-df5a-0d65-5b9b1c0c86d6%40gmail.com

OK, do you want to propose a patch?

cheers

andrew

--
Andrew Dunstan
EDB: https://www.enterprisedb.com