Re: 9.2 pg_upgrade regression tests on WIndows

On Wed, Sep 5, 2012 at 09:07:05PM -0400, Andrew Dunstan wrote:
> >OK, I worked with Andrew on this issue, and have applied the attached
> >patch which explains what is happening in this case. Andrew's #ifndef
> >WIN32 was the correct fix. I consider this issue closed.
> >
>
>
> It looks like we still have problems in this area :-( see <http://www.pgbuildfarm.org/cgi-bin/show_log.pl?nm=pitta&dt=2012-09-05%2023%3A05%3A16>
>
> Now it looks like somehow the fopen on the log file that isn't
> commented out is failing. But the identical code worked on the same
> machine on HEAD. SO this does rather look like a timing issue.
>
> Investigating ...

Yes, that is very odd. It is also right after the code we just changed
to use binary mode to split the pg_dumpall file, split_old_dump().

The code is doing pg_ctl -w stop, then starting a new postmaster with
pg_ctl -w start. Looking at the pg_ctl.c code (that you wrote), what
pg_ctl -w stop does is to wait for the postmaster.pid file to disappear,
then it returns complete. I suppose it is possible that the pid file is
getting removed, pg_ctl is returning done, but the pg_ctl binary is
still running, holding open those log files.

I guess the buildfarm is showing us the problems in pg_upgrade, as it
should. I think you might be right that we need to add a sleep(1) at
the end of stop_postmaster on Windows, and document it is to give the
postmaster time to release its log files.

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

+ It's impossible for everything to be true. +