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Bugfix: The poller often couldn't store the pid in the workerqueue

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This commit is contained in:
Michael 2017-05-30 13:20:29 +00:00
parent 62a7c8ed67
commit f6d10198cc
2 changed files with 70 additions and 29 deletions
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93
include/poller.php
View file

@ -73,6 +73,10 @@ function poller_run($argv, $argc){
while ($r = poller_worker_process()) {
if (!poller_claim_process($r[0])) {
continue;
}
// Check free memory
if ($a->min_memory_reached()) {
return;
@ -108,43 +112,22 @@ function poller_execute($queue) {
// Quit when in maintenance
if (Config::get('system', 'maintenance', true)) {
logger("Maintenance mode - quit process ".$mypid, LOGGER_DEBUG);
return false;
}
// Constantly check the number of parallel database processes
if ($a->max_processes_reached()) {
logger("Max processes reached for process ".$mypid, LOGGER_DEBUG);
return false;
}
// Constantly check the number of available database connections to let the frontend be accessible at any time
if (poller_max_connections_reached()) {
logger("Max connection reached for process ".$mypid, LOGGER_DEBUG);
return false;
}
if (!dba::update('workerqueue', array('executed' => datetime_convert(), 'pid' => $mypid),
array('id' => $queue["id"], 'pid' => 0))) {
logger("Couldn't update queue entry ".$queue["id"]." - skip this execution", LOGGER_DEBUG);
dba::commit();
return true;
}
// Assure that there are no tasks executed twice
$id = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
if (!$id) {
logger("Queue item ".$queue["id"]." vanished - skip this execution", LOGGER_DEBUG);
dba::commit();
return true;
} elseif ((strtotime($id[0]["executed"]) <= 0) OR ($id[0]["pid"] == 0)) {
logger("Entry for queue item ".$queue["id"]." wasn't stored - skip this execution", LOGGER_DEBUG);
dba::commit();
return true;
} elseif ($id[0]["pid"] != $mypid) {
logger("Queue item ".$queue["id"]." is to be executed by process ".$id[0]["pid"]." and not by me (".$mypid.") - skip this execution", LOGGER_DEBUG);
dba::commit();
return true;
}
dba::commit();
$argv = json_decode($queue["parameter"]);
// Check for existance and validity of the include file
@ -566,7 +549,7 @@ function poller_worker_process() {
// Are there waiting processes with a higher priority than the currently highest?
$r = q("SELECT * FROM `workerqueue`
WHERE `executed` <= '%s' AND `priority` < %d
ORDER BY `priority`, `created` LIMIT 1",
ORDER BY `priority`, `created` LIMIT 1 FOR UPDATE",
dbesc(NULL_DATE),
intval($highest_priority));
if (dbm::is_result($r)) {
@ -575,18 +558,70 @@ function poller_worker_process() {
// Give slower processes some processing time
$r = q("SELECT * FROM `workerqueue`
WHERE `executed` <= '%s' AND `priority` > %d
ORDER BY `priority`, `created` LIMIT 1",
ORDER BY `priority`, `created` LIMIT 1 FOR UPDATE",
dbesc(NULL_DATE),
intval($highest_priority));
if (dbm::is_result($r)) {
return $r;
}
}
// If there is no result (or we shouldn't pass lower processes) we check without priority limit
if (($highest_priority == 0) OR !dbm::is_result($r)) {
$r = q("SELECT * FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority`, `created` LIMIT 1", dbesc(NULL_DATE));
if (!dbm::is_result($r)) {
$r = q("SELECT * FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority`, `created` LIMIT 1 FOR UPDATE", dbesc(NULL_DATE));
}
return $r;
}
/**
* @brief Assigns a workerqueue entry to the current process
*
* All the checks after the update are only needed with MyISAM.
*
* @param array $queue Workerqueue entry
*
* @return boolean "true" if the claiming was successful
*/
function poller_claim_process($queue) {
$mypid = getmypid();
if (!dba::update('workerqueue', array('executed' => datetime_convert(), 'pid' => $mypid),
array('id' => $queue["id"], 'pid' => 0))) {
logger("Couldn't update queue entry ".$queue["id"]." - skip this execution", LOGGER_DEBUG);
dba::commit();
return false;
}
// Assure that there are no tasks executed twice
$id = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
if (!$id) {
logger("Queue item ".$queue["id"]." vanished - skip this execution", LOGGER_DEBUG);
dba::commit();
return false;
} elseif ((strtotime($id[0]["executed"]) <= 0) OR ($id[0]["pid"] == 0)) {
logger("Entry for queue item ".$queue["id"]." wasn't stored - skip this execution", LOGGER_DEBUG);
dba::commit();
return false;
} elseif ($id[0]["pid"] != $mypid) {
logger("Queue item ".$queue["id"]." is to be executed by process ".$id[0]["pid"]." and not by me (".$mypid.") - skip this execution", LOGGER_DEBUG);
dba::commit();
return false;
}
dba::commit();
return true;
}
/**
* @brief Removes a workerqueue entry from the current process
*/
function poller_unclaim_process() {
$mypid = getmypid();
dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0), array('pid' => $mypid));
}
/**
* @brief Call the front end worker
*/
@ -683,6 +718,8 @@ function poller_run_cron() {
if (array_search(__file__,get_included_files())===0){
poller_run($_SERVER["argv"],$_SERVER["argc"]);
poller_unclaim_process();
get_app()->end_process();
killme();

6
mod/worker.php
View file

@ -41,11 +41,15 @@ function worker_init($a){
// But since it doesn't destroy anything, we just try to get more execution time in any way.
set_time_limit(0);
poller_execute($r[0]);
if (poller_claim_process($r[0])) {
poller_execute($r[0]);
}
}
call_worker();
poller_unclaim_process();
$a->end_process();
logger("Front end worker ended: ".getmypid());