Re: [HACKERS] Stats processor not restarting - Mailing list pgsql-patches

Applied.  I did the case where we exit right away too, just for
consistency.

---------------------------------------------------------------------------

Bruce Momjian wrote:
> Tom Lane wrote:
> > Bruce Momjian <bruce@momjian.us> writes:
> > > Tom Lane wrote:
> > >> Not really, but maybe it would be sensible to reset last_pgstat_start_time
> > >> when doing a database-wide restart?
> >
> > > You mean like this, attached?
> >
> > I'd be fairly surprised if resetting the variable in the child process
> > had any effect on the postmaster...
>
> Yep, me too.  ;-)
>
> > I think a correct fix would involve exposing either the variable or a
> > routine to zero it from pgstat.c, and having postmaster.c do that at
> > the points where it intentionally SIGQUITs the stats collector.
>
> OK, patch attached.  I just reset the value in all places where we were
> killing the pgstat process and not immediately exiting ourselves.
>
> --
>   Bruce Momjian  <bruce@momjian.us>          http://momjian.us
>   EnterpriseDB                               http://www.enterprisedb.com
>
>   + If your life is a hard drive, Christ can be your backup. +

> Index: src/backend/postmaster/pgstat.c
> ===================================================================
> RCS file: /cvsroot/pgsql/src/backend/postmaster/pgstat.c,v
> retrieving revision 1.149
> diff -c -c -r1.149 pgstat.c
> *** src/backend/postmaster/pgstat.c    16 Mar 2007 17:57:36 -0000    1.149
> --- src/backend/postmaster/pgstat.c    22 Mar 2007 14:40:36 -0000
> ***************
> *** 572,577 ****
> --- 572,581 ----
>       return 0;
>   }
>
> + void allow_immediate_pgstat_restart(void)
> + {
> +         last_pgstat_start_time = 0;
> + }
>
>   /* ------------------------------------------------------------
>    * Public functions used by backends follow
> Index: src/backend/postmaster/postmaster.c
> ===================================================================
> RCS file: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v
> retrieving revision 1.526
> diff -c -c -r1.526 postmaster.c
> *** src/backend/postmaster/postmaster.c    7 Mar 2007 13:35:02 -0000    1.526
> --- src/backend/postmaster/postmaster.c    22 Mar 2007 14:40:37 -0000
> ***************
> *** 1896,1902 ****
> --- 1896,1905 ----
>                   signal_child(PgArchPID, SIGQUIT);
>               /* Tell pgstat to shut down too; nothing left for it to do */
>               if (PgStatPID != 0)
> +             {
>                   signal_child(PgStatPID, SIGQUIT);
> +                 allow_immediate_pgstat_restart();
> +             }
>               /* Tell autovac launcher to shut down too */
>               if (AutoVacPID != 0)
>                   signal_child(AutoVacPID, SIGTERM);
> ***************
> *** 1952,1958 ****
> --- 1955,1964 ----
>                   signal_child(PgArchPID, SIGQUIT);
>               /* Tell pgstat to shut down too; nothing left for it to do */
>               if (PgStatPID != 0)
> +             {
>                   signal_child(PgStatPID, SIGQUIT);
> +                 allow_immediate_pgstat_restart();
> +             }
>               /* Tell autovac launcher to shut down too */
>               if (AutoVacPID != 0)
>                   signal_child(AutoVacPID, SIGTERM);
> ***************
> *** 2241,2247 ****
> --- 2247,2256 ----
>               signal_child(PgArchPID, SIGQUIT);
>           /* Tell pgstat to shut down too; nothing left for it to do */
>           if (PgStatPID != 0)
> +         {
>               signal_child(PgStatPID, SIGQUIT);
> +             allow_immediate_pgstat_restart();
> +         }
>           /* Tell autovac launcher to shut down too */
>           if (AutoVacPID != 0)
>               signal_child(AutoVacPID, SIGTERM);
> ***************
> *** 2404,2409 ****
> --- 2413,2419 ----
>                                    "SIGQUIT",
>                                    (int) PgStatPID)));
>           signal_child(PgStatPID, SIGQUIT);
> +         allow_immediate_pgstat_restart();
>       }
>
>       /* We do NOT restart the syslogger */
> Index: src/include/pgstat.h
> ===================================================================
> RCS file: /cvsroot/pgsql/src/include/pgstat.h,v
> retrieving revision 1.55
> diff -c -c -r1.55 pgstat.h
> *** src/include/pgstat.h    16 Mar 2007 17:57:36 -0000    1.55
> --- src/include/pgstat.h    22 Mar 2007 14:40:38 -0000
> ***************
> *** 369,375 ****
>   extern void pgstat_init(void);
>   extern int    pgstat_start(void);
>   extern void pgstat_reset_all(void);
> !
>   #ifdef EXEC_BACKEND
>   extern void PgstatCollectorMain(int argc, char *argv[]);
>   #endif
> --- 369,375 ----
>   extern void pgstat_init(void);
>   extern int    pgstat_start(void);
>   extern void pgstat_reset_all(void);
> ! extern void allow_immediate_pgstat_restart(void);
>   #ifdef EXEC_BACKEND
>   extern void PgstatCollectorMain(int argc, char *argv[]);
>   #endif

>
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--
  Bruce Momjian  <bruce@momjian.us>          http://momjian.us
  EnterpriseDB                               http://www.enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +