Re: shared tempfile was not removed on statement_timeout(unreproducible)

On Fri, Dec 13, 2019 at 03:03:47PM +1300, Thomas Munro wrote:
> On Fri, Dec 13, 2019 at 7:05 AM Justin Pryzby <pryzby@telsasoft.com> wrote:
> > I have a nagios check on ancient tempfiles, intended to catch debris left by
> > crashed processes.  But triggered on this file:
> >
> > $ sudo find /var/lib/pgsql/12/data/base/pgsql_tmp -ls
> > 142977    4 drwxr-x---   3 postgres postgres     4096 Dec 12 11:32 /var/lib/pgsql/12/data/base/pgsql_tmp
> > 169868    4 drwxr-x---   2 postgres postgres     4096 Dec  7 01:35
/var/lib/pgsql/12/data/base/pgsql_tmp/pgsql_tmp11025.0.sharedfileset
> > 169347 5492 -rw-r-----   1 postgres postgres  5619712 Dec  7 01:35
/var/lib/pgsql/12/data/base/pgsql_tmp/pgsql_tmp11025.0.sharedfileset/0.0
> > 169346 5380 -rw-r-----   1 postgres postgres  5505024 Dec  7 01:35
/var/lib/pgsql/12/data/base/pgsql_tmp/pgsql_tmp11025.0.sharedfileset/1.0
> >
> > I found:
> >  2019-12-07 01:35:56 | 11025 | postgres | canceling statement due to statement timeout
            | CLUSTER pg_stat_database_snap USI
 
> >  2019-12-07 01:35:56 | 11025 | postgres | temporary file: path "base/pgsql_tmp/pgsql_tmp11025.0.sharedfileset/2.0",
size5455872 | CLUSTER pg_stat_database_snap USI
 
> 
> Hmm.  But then... maybe the two log lines you quoted should
> be the other way around for that.

And, it's actually the other way around, when I order BY something better than
left(log_time::text,19).

postgres=# SELECT log_time pid, session_line ln, pid, database db, left(message,99), left(query,33) FROM
jrn_postgres_logWHERE user_name IS NOT NULL AND log_time BETWEEN '2019-12-07 01:35' AND '2019-12-07 01:36' ORDER BY
1,2;

 2019-12-07 01:35:56.626-06 |  1 | 11025 | postgres | temporary file: path
"base/pgsql_tmp/pgsql_tmp11025.0.sharedfileset/2.0",size 5455872 | CLUSTER pg_stat_database_snap USI
 
 2019-12-07 01:35:56.626-06 |  2 | 11025 | postgres | canceling statement due to statement timeout
                    | CLUSTER pg_stat_database_snap USI