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Tweak stats collector start logic so that we will not try to spawn a
new stats collector oftener than once a minute. Per gripe from Erik Walthinsen 4/25/03.
This commit is contained in:
Tom Lane
parent
9fdb1de3ba
commit
2b1e36c7c0
@ -10,13 +10,10 @@
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*
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* - Add a pgstat config column to pg_database, so this
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* entire thing can be enabled/disabled on a per db base.
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* Not to be done before 7.2 - requires catalog change and
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* thus an initdb and we might want to provide this as a
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* patch for 7.1.
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*
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* Copyright (c) 2001, PostgreSQL Global Development Group
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* Copyright (c) 2001-2003, PostgreSQL Global Development Group
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*
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* $Header: /cvsroot/pgsql/src/backend/postmaster/pgstat.c,v 1.33 2003/04/25 01:24:00 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/postmaster/pgstat.c,v 1.34 2003/04/26 02:57:14 tgl Exp $
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* ----------
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*/
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#include "postgres.h"
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@ -31,6 +28,8 @@
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#include <errno.h>
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#include <signal.h>
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#include "pgstat.h"
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#include "access/xact.h"
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#include "access/heapam.h"
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#include "catalog/catname.h"
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@ -47,8 +46,6 @@
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#include "utils/ps_status.h"
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#include "utils/syscache.h"
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#include "pgstat.h"
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/* ----------
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* GUC parameters
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@ -60,6 +57,12 @@ bool pgstat_collect_querystring = false;
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bool pgstat_collect_tuplelevel = false;
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bool pgstat_collect_blocklevel = false;
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/* ----------
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* Other global variables
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* ----------
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*/
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bool pgstat_is_running = false;
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/* ----------
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* Local data
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* ----------
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@ -69,8 +72,8 @@ static int pgStatPipe[2];
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static struct sockaddr_in pgStatAddr;
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static int pgStatPmPipe[2] = {-1, -1};
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static int pgStatRunning = 0;
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static int pgStatPid;
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static time_t last_pgstat_start_time;
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static long pgStatNumMessages = 0;
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@ -130,14 +133,12 @@ static void pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len);
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* pgstat_init() -
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*
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* Called from postmaster at startup. Create the resources required
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* by the statistics collector process.
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*
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* NOTE: failure exit from this routine causes the postmaster to abort.
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* This is unfriendly and should not be done except in dire straits.
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* Better to let the postmaster start with stats collection disabled.
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* by the statistics collector process. If unable to do so, do not
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* fail --- better to let the postmaster start with stats collection
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* disabled.
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* ----------
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*/
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int
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void
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pgstat_init(void)
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{
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int alen;
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@ -168,7 +169,7 @@ pgstat_init(void)
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* Nothing else required if collector will not get started
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*/
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if (!pgstat_collect_startcollector)
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return 0;
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return;
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/*
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* Create the UDP socket for sending and receiving statistic messages
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@ -231,7 +232,7 @@ pgstat_init(void)
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goto startup_failed;
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}
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return 0;
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return;
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startup_failed:
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if (pgStatSock >= 0)
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@ -239,11 +240,10 @@ startup_failed:
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pgStatSock = -1;
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/* Adjust GUC variables to suppress useless activity */
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pgstat_collect_startcollector = false;
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pgstat_collect_querystring = false;
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pgstat_collect_tuplelevel = false;
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pgstat_collect_blocklevel = false;
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return 0;
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}
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@ -251,31 +251,51 @@ startup_failed:
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* pgstat_start() -
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*
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* Called from postmaster at startup or after an existing collector
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* died. Fire up a fresh statistics collector.
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* died. Attempt to fire up a fresh statistics collector.
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*
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* NOTE: failure exit from this routine causes the postmaster to abort.
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* Note: if fail, we will be called again from the postmaster main loop.
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* ----------
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*/
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int
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void
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pgstat_start(void)
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{
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time_t curtime;
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/*
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* Do nothing if no collector needed
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*/
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if (!pgstat_collect_startcollector)
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return 0;
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if (pgstat_is_running || !pgstat_collect_startcollector)
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return;
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/*
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* Check that the socket is there, else pgstat_init failed
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* Do nothing if too soon since last collector start. This is a
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* safety valve to protect against continuous respawn attempts if
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* the collector is dying immediately at launch. Note that since
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* we will be re-called from the postmaster main loop, we will get
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* another chance later.
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*/
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curtime = time(NULL);
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if ((unsigned int) (curtime - last_pgstat_start_time) <
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(unsigned int) PGSTAT_RESTART_INTERVAL)
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return;
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last_pgstat_start_time = curtime;
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/*
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* Check that the socket is there, else pgstat_init failed.
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*/
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if (pgStatSock < 0)
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{
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elog(LOG, "PGSTAT: statistics collector startup skipped");
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return 0;
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/*
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* We can only get here if someone tries to manually turn
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* pgstat_collect_startcollector on after it had been off.
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*/
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pgstat_collect_startcollector = false;
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return;
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}
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/*
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* Then fork off the collector. Remember its PID for pgstat_ispgstat.
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* Okay, fork off the collector. Remember its PID for pgstat_ispgstat.
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*/
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fflush(stdout);
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@ -294,15 +314,14 @@ pgstat_start(void)
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beos_backend_startup_failed();
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#endif
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elog(LOG, "PGSTAT: fork() failed: %m");
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pgStatRunning = 0;
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return 0;
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return;
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case 0:
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break;
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default:
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pgStatRunning = 1;
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return 0;
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pgstat_is_running = true;
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return;
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}
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/* in postmaster child ... */
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@ -335,16 +354,19 @@ pgstat_start(void)
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* was the statistics collector.
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* ----------
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*/
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int
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bool
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pgstat_ispgstat(int pid)
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{
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if (pgStatRunning == 0)
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return 0;
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if (!pgstat_is_running)
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return false;
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if (pgStatPid != pid)
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return 0;
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return false;
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return 1;
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/* Oh dear ... */
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pgstat_is_running = false;
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return true;
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}
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@ -37,7 +37,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.314 2003/04/22 00:08:06 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.315 2003/04/26 02:57:14 tgl Exp $
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*
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* NOTES
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*
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@ -790,12 +790,10 @@ PostmasterMain(int argc, char *argv[])
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}
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/*
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* Initialize and startup the statistics collector process
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* Initialize and try to startup the statistics collector process
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*/
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if (pgstat_init() < 0)
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ExitPostmaster(1);
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if (pgstat_start() < 0)
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ExitPostmaster(1);
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pgstat_init();
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pgstat_start();
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/*
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* Load cached files for client authentication.
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@ -1058,6 +1056,10 @@ ServerLoop(void)
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ConnFree(port);
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}
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}
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/* If we have lost the stats collector, try to start a new one */
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if (!pgstat_is_running)
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pgstat_start();
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}
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}
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@ -1720,8 +1722,9 @@ reaper(SIGNAL_ARGS)
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#endif
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/*
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* Check if this child was the statistics collector. If so, start
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* a new one.
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* Check if this child was the statistics collector. If so,
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* try to start a new one. (If fail, we'll try again in
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* future cycles of the main loop.)
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*/
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if (pgstat_ispgstat(pid))
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{
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@ -3,15 +3,18 @@
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*
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* Definitions for the PostgreSQL statistics collector daemon.
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*
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* Copyright (c) 2001, PostgreSQL Global Development Group
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* Copyright (c) 2001-2003, PostgreSQL Global Development Group
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*
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* $Id: pgstat.h,v 1.13 2003/03/20 03:34:56 momjian Exp $
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* $Id: pgstat.h,v 1.14 2003/04/26 02:57:14 tgl Exp $
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* ----------
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*/
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#ifndef PGSTAT_H
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#define PGSTAT_H
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#include "utils/hsearch.h"
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#include "utils/nabstime.h"
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#include "utils/rel.h"
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/* ----------
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* Paths for the statistics files. The %s is replaced with the
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@ -26,16 +29,17 @@
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* ----------
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*/
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#define PGSTAT_STAT_INTERVAL 500 /* How often to write the status */
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/* file, in milliseconds. */
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/* file; in milliseconds. */
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#define PGSTAT_DESTROY_DELAY 10000 /* How long to keep destroyed */
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/* objects known to give delayed */
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/* UDP packets time to arrive, */
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/* objects known, to give delayed */
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/* UDP packets time to arrive; */
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/* in milliseconds. */
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#define PGSTAT_DESTROY_COUNT (PGSTAT_DESTROY_DELAY \
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/ PGSTAT_STAT_INTERVAL)
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#define PGSTAT_DESTROY_COUNT (PGSTAT_DESTROY_DELAY / PGSTAT_STAT_INTERVAL)
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#define PGSTAT_RESTART_INTERVAL 60 /* How often to attempt to restart */
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/* a failed statistics collector; in seconds. */
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/* ----------
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* How much of the actual query string to send to the collector.
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@ -323,7 +327,7 @@ typedef union PgStat_Msg
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/* ----------
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* Global variables
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* GUC parameters
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* ----------
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*/
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extern bool pgstat_collect_startcollector;
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@ -332,13 +336,19 @@ extern bool pgstat_collect_querystring;
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extern bool pgstat_collect_tuplelevel;
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extern bool pgstat_collect_blocklevel;
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/* ----------
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* Other global variables
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* ----------
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*/
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extern bool pgstat_is_running;
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/* ----------
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* Functions called from postmaster
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* ----------
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*/
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extern int pgstat_init(void);
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extern int pgstat_start(void);
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extern int pgstat_ispgstat(int pid);
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extern void pgstat_init(void);
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extern void pgstat_start(void);
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extern bool pgstat_ispgstat(int pid);
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extern void pgstat_close_sockets(void);
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extern void pgstat_beterm(int pid);
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