int
wd_escalation(void)
{
int rtn;
pool_log("wd_escalation: escalating to master pgpool");
/* clear shared memory cache */
if (pool_config->memory_cache_enabled && pool_is_shmem_cache() &&
pool_config->clear_memqcache_on_escalation)
{
pool_log("wd_escalation: clear all the query cache on shared memory");
pool_clear_memory_cache();
}
/* execute escalation command */
if (strlen(pool_config->wd_escalation_command))
{
system(pool_config->wd_escalation_command);
}
/* interface up as delegate IP */
if (strlen(pool_config->delegate_IP) != 0)
wd_IP_up();
/* set master status to the wd list */
wd_set_wd_list(pool_config->wd_hostname, pool_config->port,
pool_config->wd_port, pool_config->delegate_IP,
NULL, WD_MASTER);
/* send declare packet */
rtn = wd_declare();
if (rtn == WD_OK)
{
pool_log("wd_escalation: escalated to master pgpool successfully");
}
return rtn;
}
/*
* fork escalation process
*/
pid_t
fork_escalation_process(void)
{
pid_t pid;
pid = fork();
if (pid != 0)
{
if (pid == -1)
ereport(NOTICE,
(errmsg("failed to fork a escalation process")));
return pid;
}
on_exit_reset();
processType = PT_WATCHDOG_UTILITY;
POOL_SETMASK(&UnBlockSig);
init_ps_display("", "", "", "");
pool_signal(SIGTERM, wd_exit);
pool_signal(SIGINT, wd_exit);
pool_signal(SIGQUIT, wd_exit);
pool_signal(SIGCHLD, SIG_DFL);
pool_signal(SIGHUP, SIG_IGN);
pool_signal(SIGPIPE, SIG_IGN);
MemoryContextSwitchTo(TopMemoryContext);
set_ps_display("watchdog escalation", false);
ereport(LOG,
(errmsg("watchdog: escalation started")));
/*
* STEP 1 clear shared memory cache
*/
if (pool_config->memory_cache_enabled && pool_is_shmem_cache() &&
pool_config->clear_memqcache_on_escalation)
{
ereport(LOG,
(errmsg("watchdog escalation"),
errdetail("clearing all the query cache on shared memory")));
pool_clear_memory_cache();
}
/*
* STEP 2 execute escalation command provided by user in pgpool conf file
*/
if (strlen(pool_config->wd_escalation_command))
{
int r = system(pool_config->wd_escalation_command);
if (WIFEXITED(r))
{
if (WEXITSTATUS(r) == EXIT_SUCCESS)
ereport(LOG,
(errmsg("watchdog escalation successful")));
else
{
ereport(WARNING,
(errmsg("watchdog escalation command failed with exit status: %d", WEXITSTATUS(r))));
}
}
else
{
ereport(WARNING,
(errmsg("watchdog escalation command exit abnormally")));
}
}
/*
* STEP 3 bring up the delegate IP
*/
if (strlen(pool_config->delegate_IP) != 0)
{
if (wd_IP_up() != WD_OK)
ereport(WARNING,
(errmsg("watchdog escalation failed to acquire delegate IP")));
}
exit(0);
}
