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Arrange to explicitly stop the pgstat processes at the same time we
begin the shutdown checkpoint; there isn't anything left for them to do, so we may as well ensure that they shut down sooner rather than later. Per discussion.
This commit is contained in:
Tom Lane
parent
f4b0d28aa0
commit
bbe42a1514
@ -13,7 +13,7 @@
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*
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* Copyright (c) 2001-2003, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.74 2004/06/03 02:08:03 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.75 2004/06/14 18:08:18 tgl Exp $
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* ----------
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*/
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#include "postgres.h"
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@ -65,12 +65,6 @@ 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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@ -79,7 +73,6 @@ NON_EXEC_STATIC int pgStatSock = -1;
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static int pgStatPipe[2];
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static struct sockaddr_storage pgStatAddr;
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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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@ -125,6 +118,7 @@ static void pgstat_parseArgs(int argc, char *argv[]);
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NON_EXEC_STATIC void PgstatBufferMain(int argc, char *argv[]);
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NON_EXEC_STATIC void PgstatCollectorMain(int argc, char *argv[]);
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static void pgstat_recvbuffer(void);
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static void pgstat_exit(SIGNAL_ARGS);
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static void pgstat_die(SIGNAL_ARGS);
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static int pgstat_add_backend(PgStat_MsgHdr *msg);
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@ -496,19 +490,22 @@ pgstat_parseArgs(int argc, char *argv[])
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* Called from postmaster at startup or after an existing collector
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* died. Attempt to fire up a fresh statistics collector.
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*
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* Returns PID of child process, or 0 if fail.
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*
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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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void
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int
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pgstat_start(void)
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{
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time_t curtime;
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pid_t pgStatPid;
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/*
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* Do nothing if no collector needed
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*/
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if (pgstat_is_running || !pgstat_collect_startcollector)
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return;
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if (!pgstat_collect_startcollector)
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return 0;
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/*
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* Do nothing if too soon since last collector start. This is a
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@ -520,7 +517,7 @@ pgstat_start(void)
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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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return 0;
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last_pgstat_start_time = curtime;
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/*
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@ -536,12 +533,11 @@ pgstat_start(void)
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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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return 0;
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}
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/*
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* Okay, fork off the collector. Remember its PID for
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* pgstat_ispgstat.
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* Okay, fork off the collector.
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*/
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fflush(stdout);
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@ -553,9 +549,9 @@ pgstat_start(void)
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#endif
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#ifdef EXEC_BACKEND
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switch ((pgStatPid = (int) pgstat_forkexec(STAT_PROC_BUFFER)))
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switch ((pgStatPid = pgstat_forkexec(STAT_PROC_BUFFER)))
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#else
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switch ((pgStatPid = (int) fork()))
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switch ((pgStatPid = fork()))
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#endif
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{
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case -1:
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@ -565,7 +561,7 @@ pgstat_start(void)
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#endif
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ereport(LOG,
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(errmsg("could not fork statistics buffer: %m")));
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return;
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return 0;
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#ifndef EXEC_BACKEND
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case 0:
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@ -585,32 +581,11 @@ pgstat_start(void)
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#endif
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default:
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pgstat_is_running = true;
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return;
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return (int) pgStatPid;
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}
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}
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/* ----------
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* pgstat_ispgstat() -
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*
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* Called from postmaster to check if a terminated child process
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* was the statistics collector.
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* ----------
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*/
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bool
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pgstat_ispgstat(int pid)
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{
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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 false;
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/* Oh dear ... */
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pgstat_is_running = false;
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return true;
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/* shouldn't get here */
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return 0;
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}
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@ -1381,12 +1356,12 @@ PgstatBufferMain(int argc, char *argv[])
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/*
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* Ignore all signals usually bound to some action in the postmaster,
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* except for SIGCHLD --- see pgstat_recvbuffer.
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* except for SIGCHLD and SIGQUIT --- see pgstat_recvbuffer.
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*/
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pqsignal(SIGHUP, SIG_IGN);
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pqsignal(SIGINT, SIG_IGN);
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pqsignal(SIGTERM, SIG_IGN);
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pqsignal(SIGQUIT, SIG_IGN);
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pqsignal(SIGQUIT, pgstat_exit);
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pqsignal(SIGALRM, SIG_IGN);
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pqsignal(SIGPIPE, SIG_IGN);
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pqsignal(SIGUSR1, SIG_IGN);
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@ -1476,9 +1451,9 @@ PgstatCollectorMain(int argc, char *argv[])
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/*
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* Reset signal handling. With the exception of restoring default
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* SIGCHLD handling, this is a no-op in the non-EXEC_BACKEND case
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* because we'll have inherited these settings from the buffer process;
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* but it's not a no-op for EXEC_BACKEND.
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* SIGCHLD and SIGQUIT handling, this is a no-op in the non-EXEC_BACKEND
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* case because we'll have inherited these settings from the buffer
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* process; but it's not a no-op for EXEC_BACKEND.
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*/
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pqsignal(SIGHUP, SIG_IGN);
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pqsignal(SIGINT, SIG_IGN);
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@ -1885,9 +1860,9 @@ pgstat_recvbuffer(void)
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}
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/*
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* Wait for some work to do; but not for more than 10 seconds
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* (this determines how quickly we will shut down after postmaster
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* termination).
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* Wait for some work to do; but not for more than 10 seconds.
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* (This determines how quickly we will shut down after an
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* ungraceful postmaster termination; so it needn't be very fast.)
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*/
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timeout.tv_sec = 10;
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timeout.tv_usec = 0;
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@ -1992,19 +1967,33 @@ pgstat_recvbuffer(void)
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/*
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* Make sure we forwarded all messages before we check for
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* Postmaster termination.
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* postmaster termination.
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*/
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if (msg_have != 0 || FD_ISSET(pgStatSock, &rfds))
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continue;
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/*
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* If the postmaster has terminated, we've done our job.
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* If the postmaster has terminated, we die too. (This is no longer
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* the normal exit path, however.)
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*/
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if (!PostmasterIsAlive(true))
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exit(0);
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}
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}
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/* SIGQUIT signal handler for buffer process */
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static void
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pgstat_exit(SIGNAL_ARGS)
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{
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/*
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* For now, we just nail the doors shut and get out of town. It might
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* be cleaner to allow any pending messages to be sent, but that creates
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* a tradeoff against speed of exit.
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*/
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exit(0);
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}
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/* SIGCHLD signal handler for buffer process */
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static void
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pgstat_die(SIGNAL_ARGS)
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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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* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.403 2004/06/11 03:54:43 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.404 2004/06/14 18:08:19 tgl Exp $
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*
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* NOTES
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*
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@ -191,7 +191,8 @@ char *preload_libraries_string = NULL;
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/* PIDs of special child processes; 0 when not running */
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static pid_t StartupPID = 0,
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BgWriterPID = 0;
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BgWriterPID = 0,
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PgStatPID = 0;
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/* Startup/shutdown state */
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#define NoShutdown 0
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@ -812,10 +813,9 @@ PostmasterMain(int argc, char *argv[])
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whereToSendOutput = None;
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/*
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* Initialize and try to startup the statistics collector process
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* Initialize the statistics collector stuff
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*/
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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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@ -1149,8 +1149,9 @@ ServerLoop(void)
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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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if (PgStatPID == 0 &&
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StartupPID == 0 && !FatalError && Shutdown == NoShutdown)
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PgStatPID = pgstat_start();
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/*
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* Touch the socket and lock file at least every ten minutes, to ensure
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@ -1509,14 +1510,6 @@ processCancelRequest(Port *port, void *pkt)
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backendPID = (int) ntohl(canc->backendPID);
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cancelAuthCode = (long) ntohl(canc->cancelAuthCode);
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if (backendPID == BgWriterPID)
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{
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ereport(DEBUG2,
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(errmsg_internal("ignoring cancel request for bgwriter process %d",
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backendPID)));
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return;
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}
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/*
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* See if we have a matching backend. In the EXEC_BACKEND case, we
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* can no longer access the postmaster's own backend list, and must
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@ -1698,6 +1691,7 @@ SIGHUP_handler(SIGNAL_ARGS)
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SignalChildren(SIGHUP);
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if (BgWriterPID != 0)
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kill(BgWriterPID, SIGHUP);
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/* PgStatPID does not currently need SIGHUP */
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load_hba();
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load_ident();
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@ -1755,6 +1749,9 @@ pmdie(SIGNAL_ARGS)
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/* And tell it to shut down */
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if (BgWriterPID != 0)
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kill(BgWriterPID, SIGUSR2);
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/* Tell pgstat to shut down too; nothing left for it to do */
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if (PgStatPID != 0)
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kill(PgStatPID, SIGQUIT);
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break;
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case SIGINT:
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@ -1796,6 +1793,9 @@ pmdie(SIGNAL_ARGS)
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/* And tell it to shut down */
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if (BgWriterPID != 0)
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kill(BgWriterPID, SIGUSR2);
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/* Tell pgstat to shut down too; nothing left for it to do */
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if (PgStatPID != 0)
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kill(PgStatPID, SIGQUIT);
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break;
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case SIGQUIT:
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@ -1811,6 +1811,8 @@ pmdie(SIGNAL_ARGS)
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kill(StartupPID, SIGQUIT);
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if (BgWriterPID != 0)
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kill(BgWriterPID, SIGQUIT);
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if (PgStatPID != 0)
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kill(PgStatPID, SIGQUIT);
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if (DLGetHead(BackendList))
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SignalChildren(SIGQUIT);
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ExitPostmaster(0);
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@ -1867,19 +1869,6 @@ reaper(SIGNAL_ARGS)
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#endif /* WIN32 */
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#endif /* HAVE_WAITPID */
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/*
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* Check if this child was the statistics collector. If so, try to
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* start a new one. (If fail, we'll try again in future cycles of
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* the main loop.)
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*/
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if (pgstat_ispgstat(pid))
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{
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LogChildExit(LOG, gettext("statistics collector process"),
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pid, exitstatus);
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pgstat_start();
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continue;
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}
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/*
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* Check if this child was a startup process.
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*/
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@ -1909,9 +1898,12 @@ reaper(SIGNAL_ARGS)
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/*
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* Go to shutdown mode if a shutdown request was pending.
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* Otherwise, try to start the stats collector too.
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*/
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if (Shutdown > NoShutdown && BgWriterPID != 0)
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kill(BgWriterPID, SIGUSR2);
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else if (PgStatPID == 0 && Shutdown == NoShutdown)
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PgStatPID = pgstat_start();
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continue;
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}
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@ -1921,6 +1913,7 @@ reaper(SIGNAL_ARGS)
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*/
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if (BgWriterPID != 0 && pid == BgWriterPID)
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{
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BgWriterPID = 0;
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if (exitstatus == 0 && Shutdown > NoShutdown &&
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!FatalError && !DLGetHead(BackendList))
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{
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@ -1936,12 +1929,28 @@ reaper(SIGNAL_ARGS)
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/*
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* Any unexpected exit of the bgwriter is treated as a crash.
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*/
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LogChildExit(DEBUG2, gettext("background writer process"),
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LogChildExit(LOG, gettext("background writer process"),
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pid, exitstatus);
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HandleChildCrash(pid, exitstatus);
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continue;
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}
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/*
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* Was it the statistics collector? If so, just try to start a new
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* one; no need to force reset of the rest of the system. (If fail,
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* we'll try again in future cycles of the main loop.)
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*/
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if (PgStatPID != 0 && pid == PgStatPID)
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{
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PgStatPID = 0;
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if (exitstatus != 0)
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LogChildExit(LOG, gettext("statistics collector process"),
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pid, exitstatus);
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if (StartupPID == 0 && !FatalError && Shutdown == NoShutdown)
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PgStatPID = pgstat_start();
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continue;
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}
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/*
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* Else do standard backend child cleanup.
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*/
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@ -2113,6 +2122,17 @@ HandleChildCrash(int pid,
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kill(BgWriterPID, (SendStop ? SIGSTOP : SIGQUIT));
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}
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/* Force a power-cycle of the pgstat processes too */
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/* (Shouldn't be necessary, but just for luck) */
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if (PgStatPID != 0 && !FatalError)
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{
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ereport(DEBUG2,
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(errmsg_internal("sending %s to process %d",
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"SIGQUIT",
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(int) PgStatPID)));
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kill(PgStatPID, SIGQUIT);
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}
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FatalError = true;
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}
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@ -2152,7 +2172,7 @@ LogChildExit(int lev, const char *procname, int pid, int exitstatus)
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}
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/*
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* Send a signal to all backend children.
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* Send a signal to all backend children (but NOT special children)
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*/
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static void
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SignalChildren(int signal)
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@ -2954,7 +2974,7 @@ PostmasterRandom(void)
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}
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/*
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* Count up number of child processes.
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* Count up number of child processes (regular backends only)
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*/
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static int
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CountChildren(void)
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@ -5,7 +5,7 @@
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*
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* Copyright (c) 2001-2003, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/include/pgstat.h,v 1.23 2004/05/29 22:48:22 tgl Exp $
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* $PostgreSQL: pgsql/src/include/pgstat.h,v 1.24 2004/06/14 18:08:19 tgl Exp $
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* ----------
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*/
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#ifndef PGSTAT_H
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@ -335,20 +335,13 @@ 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 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 int pgstat_start(void);
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extern void pgstat_beterm(int pid);
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#ifdef EXEC_BACKEND
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