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XLOG file archiving and point-in-time recovery. There are still some

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loose ends and a glaring lack of documentation, but it basically works.

Simon Riggs with some editorialization by Tom Lane.
This commit is contained in:
Tom Lane
2004-07-19 02:47:16 +00:00
parent d0c1bbdcc6
commit 66ec2db728
13 changed files with 1628 additions and 72 deletions
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87
src/backend/postmaster/postmaster.c
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@@ -37,7 +37,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.411 2004/07/12 19:14:56 momjian Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.412 2004/07/19 02:47:08 tgl Exp $
*
* NOTES
*
@@ -104,6 +104,7 @@
#include "miscadmin.h"
#include "nodes/nodes.h"
#include "postmaster/postmaster.h"
#include "postmaster/pgarch.h"
#include "storage/fd.h"
#include "storage/ipc.h"
#include "storage/pg_shmem.h"
@@ -198,6 +199,7 @@ char *preload_libraries_string = NULL;
/* PIDs of special child processes; 0 when not running */
static pid_t StartupPID = 0,
BgWriterPID = 0,
PgArchPID = 0,
PgStatPID = 0;
/* Startup/shutdown state */
@@ -826,7 +828,8 @@ PostmasterMain(int argc, char *argv[])
*
* CAUTION: when changing this list, check for side-effects on the signal
* handling setup of child processes. See tcop/postgres.c,
* bootstrap/bootstrap.c, postmaster/bgwriter.c, and postmaster/pgstat.c.
* bootstrap/bootstrap.c, postmaster/bgwriter.c, postmaster/pgarch.c,
* and postmaster/pgstat.c.
*/
pqinitmask();
PG_SETMASK(&BlockSig);
@@ -1217,6 +1220,11 @@ ServerLoop(void)
kill(BgWriterPID, SIGUSR2);
}
/* If we have lost the archiver, try to start a new one */
if (XLogArchivingActive() && PgArchPID == 0 &&
StartupPID == 0 && !FatalError && Shutdown == NoShutdown)
PgArchPID = pgarch_start();
/* If we have lost the stats collector, try to start a new one */
if (PgStatPID == 0 &&
StartupPID == 0 && !FatalError && Shutdown == NoShutdown)
@@ -1760,6 +1768,8 @@ SIGHUP_handler(SIGNAL_ARGS)
SignalChildren(SIGHUP);
if (BgWriterPID != 0)
kill(BgWriterPID, SIGHUP);
if (PgArchPID != 0)
kill(PgArchPID, SIGHUP);
/* PgStatPID does not currently need SIGHUP */
load_hba();
load_ident();
@@ -1818,6 +1828,9 @@ pmdie(SIGNAL_ARGS)
/* And tell it to shut down */
if (BgWriterPID != 0)
kill(BgWriterPID, SIGUSR2);
/* Tell pgarch to shut down too; nothing left for it to do */
if (PgArchPID != 0)
kill(PgArchPID, SIGQUIT);
/* Tell pgstat to shut down too; nothing left for it to do */
if (PgStatPID != 0)
kill(PgStatPID, SIGQUIT);
@@ -1862,6 +1875,9 @@ pmdie(SIGNAL_ARGS)
/* And tell it to shut down */
if (BgWriterPID != 0)
kill(BgWriterPID, SIGUSR2);
/* Tell pgarch to shut down too; nothing left for it to do */
if (PgArchPID != 0)
kill(PgArchPID, SIGQUIT);
/* Tell pgstat to shut down too; nothing left for it to do */
if (PgStatPID != 0)
kill(PgStatPID, SIGQUIT);
@@ -1880,6 +1896,8 @@ pmdie(SIGNAL_ARGS)
kill(StartupPID, SIGQUIT);
if (BgWriterPID != 0)
kill(BgWriterPID, SIGQUIT);
if (PgArchPID != 0)
kill(PgArchPID, SIGQUIT);
if (PgStatPID != 0)
kill(PgStatPID, SIGQUIT);
if (DLGetHead(BackendList))
@@ -1967,12 +1985,16 @@ reaper(SIGNAL_ARGS)
/*
* Go to shutdown mode if a shutdown request was pending.
* Otherwise, try to start the stats collector too.
* Otherwise, try to start the archiver and stats collector too.
*/
if (Shutdown > NoShutdown && BgWriterPID != 0)
kill(BgWriterPID, SIGUSR2);
else if (PgStatPID == 0 && Shutdown == NoShutdown)
PgStatPID = pgstat_start();
else if (Shutdown == NoShutdown) {
if (XLogArchivingActive() && PgArchPID == 0)
PgArchPID = pgarch_start();
if (PgStatPID == 0)
PgStatPID = pgstat_start();
}
continue;
}
@@ -2004,6 +2026,23 @@ reaper(SIGNAL_ARGS)
continue;
}
/*
* Was it the archiver? If so, just try to start a new
* one; no need to force reset of the rest of the system. (If fail,
* we'll try again in future cycles of the main loop.)
*/
if (PgArchPID != 0 && pid == PgArchPID)
{
PgArchPID = 0;
if (exitstatus != 0)
LogChildExit(LOG, gettext("archiver process"),
pid, exitstatus);
if (XLogArchivingActive() &&
StartupPID == 0 && !FatalError && Shutdown == NoShutdown)
PgArchPID = pgarch_start();
continue;
}
/*
* Was it the statistics collector? If so, just try to start a new
* one; no need to force reset of the rest of the system. (If fail,
@@ -2029,8 +2068,9 @@ reaper(SIGNAL_ARGS)
if (FatalError)
{
/*
* Wait for all children exit, then reset shmem and
* StartupDataBase.
* Wait for all important children to exit, then reset shmem and
* StartupDataBase. (We can ignore the archiver and stats processes
* here since they are not connected to shmem.)
*/
if (DLGetHead(BackendList) || StartupPID != 0 || BgWriterPID != 0)
goto reaper_done;
@@ -2191,6 +2231,17 @@ HandleChildCrash(int pid,
kill(BgWriterPID, (SendStop ? SIGSTOP : SIGQUIT));
}
/* Force a power-cycle of the pgarch process too */
/* (Shouldn't be necessary, but just for luck) */
if (PgArchPID != 0 && !FatalError)
{
ereport(DEBUG2,
(errmsg_internal("sending %s to process %d",
"SIGQUIT",
(int) PgArchPID)));
kill(PgArchPID, SIGQUIT);
}
/* Force a power-cycle of the pgstat processes too */
/* (Shouldn't be necessary, but just for luck) */
if (PgStatPID != 0 && !FatalError)
@@ -2873,6 +2924,16 @@ SubPostmasterMain(int argc, char *argv[])
BootstrapMain(argc - 2, argv + 2);
proc_exit(0);
}
if (strcmp(argv[1], "-forkarch") == 0)
{
/* Close the postmaster's sockets */
ClosePostmasterPorts();
/* Do not want to attach to shared memory */
PgArchiverMain(argc, argv);
proc_exit(0);
}
if (strcmp(argv[1], "-forkbuf") == 0)
{
/* Close the postmaster's sockets */
@@ -2951,6 +3012,18 @@ sigusr1_handler(SIGNAL_ARGS)
if (Shutdown <= SmartShutdown)
SignalChildren(SIGUSR1);
}
if (PgArchPID != 0 && Shutdown == NoShutdown)
{
if (CheckPostmasterSignal(PMSIGNAL_WAKEN_ARCHIVER))
{
/*
* Send SIGUSR1 to archiver process, to wake it up and begin
* archiving next transaction log file.
*/
kill(PgArchPID, SIGUSR1);
}
}
PG_SETMASK(&UnBlockSig);