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pg_ctl promote

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Fujii Masao, reviewed by Robert Haas, Stephen Frost, and Magnus Hagander.
This commit is contained in:
Robert Haas
2011-02-15 21:28:48 -05:00
parent 8ddc05fb01
commit 4695da5ae9
7 changed files with 152 additions and 21 deletions
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49
src/backend/access/transam/xlog.c
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@ -62,6 +62,7 @@
/* File path names (all relative to $PGDATA) */
#define RECOVERY_COMMAND_FILE "recovery.conf"
#define RECOVERY_COMMAND_DONE "recovery.done"
#define PROMOTE_SIGNAL_FILE "promote"
/* User-settable parameters */
@ -565,6 +566,7 @@ typedef struct xl_restore_point
*/
static volatile sig_atomic_t got_SIGHUP = false;
static volatile sig_atomic_t shutdown_requested = false;
static volatile sig_atomic_t promote_triggered = false;
/*
* Flag set when executing a restore command, to tell SIGTERM signal handler
@ -9669,6 +9671,14 @@ StartupProcSigUsr1Handler(SIGNAL_ARGS)
latch_sigusr1_handler();
}
/* SIGUSR2: set flag to finish recovery */
static void
StartupProcTriggerHandler(SIGNAL_ARGS)
{
promote_triggered = true;
WakeupRecovery();
}
/* SIGHUP: set flag to re-read config file at next convenient time */
static void
StartupProcSigHupHandler(SIGNAL_ARGS)
@ -9746,7 +9756,7 @@ StartupProcessMain(void)
pqsignal(SIGALRM, SIG_IGN);
pqsignal(SIGPIPE, SIG_IGN);
pqsignal(SIGUSR1, StartupProcSigUsr1Handler);
pqsignal(SIGUSR2, SIG_IGN);
pqsignal(SIGUSR2, StartupProcTriggerHandler);
/*
* Reset some signals that are accepted by postmaster but not here
@ -10192,9 +10202,9 @@ emode_for_corrupt_record(int emode, XLogRecPtr RecPtr)
}
/*
* Check to see if the trigger file exists. If it does, request postmaster
* to shut down walreceiver, wait for it to exit, remove the trigger
* file, and return true.
* Check to see whether the user-specified trigger file exists and whether a
* promote request has arrived. If either condition holds, request postmaster
* to shut down walreceiver, wait for it to exit, and return true.
*/
static bool
CheckForStandbyTrigger(void)
@ -10205,6 +10215,16 @@ CheckForStandbyTrigger(void)
if (triggered)
return true;
if (promote_triggered)
{
ereport(LOG,
(errmsg("received promote request")));
ShutdownWalRcv();
promote_triggered = false;
triggered = true;
return true;
}
if (TriggerFile == NULL)
return false;
@ -10220,6 +10240,27 @@ CheckForStandbyTrigger(void)
return false;
}
/*
* Check to see if a promote request has arrived. Should be
* called by postmaster after receiving SIGUSR1.
*/
bool
CheckPromoteSignal(void)
{
struct stat stat_buf;
if (stat(PROMOTE_SIGNAL_FILE, &stat_buf) == 0)
{
/*
* Since we are in a signal handler, it's not safe
* to elog. We silently ignore any error from unlink.
*/
unlink(PROMOTE_SIGNAL_FILE);
return true;
}
return false;
}
/*
* Wake up startup process to replay newly arrived WAL, or to notice that
* failover has been requested.