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Merge pull request #9092 from annando/multiple-fetch

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Worker: Fetch jobs for multiple workers
This commit is contained in:
Hypolite Petovan 2020-08-29 20:45:00 -04:00 committed by GitHub
commit bc67808f09
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 80 additions and 27 deletions
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102
src/Core/Worker.php
View file

@ -91,12 +91,13 @@ class Worker
self::runCron();
}
$starttime = time();
$last_check = $starttime = time();
self::$state = self::STATE_STARTUP;
// We fetch the next queue entry that is about to be executed
while ($r = self::workerProcess()) {
$refetched = false;
// Don't refetch when a worker fetches tasks for multiple workers
$refetched = DI::config()->get('system', 'worker_multiple_fetch');
foreach ($r as $entry) {
// Assure that the priority is an integer value
$entry['priority'] = (int)$entry['priority'];
@ -119,7 +120,7 @@ class Worker
}
// To avoid the quitting of multiple workers only one worker at a time will execute the check
if (!self::getWaitingJobForPID()) {
if ((time() > $last_check + 5) && !self::getWaitingJobForPID()) {
self::$state = self::STATE_LONG_LOOP;
if (DI::lock()->acquire(self::LOCK_WORKER, 0)) {
@ -138,11 +139,13 @@ class Worker
}
DI::lock()->release(self::LOCK_WORKER);
}
$last_check = time();
}
// Quit the worker once every cron interval
if (time() > ($starttime + (DI::config()->get('system', 'cron_interval') * 60))) {
Logger::info('Process lifetime reached, respawning.');
self::unclaimProcess();
self::spawnWorker();
return;
}
@ -782,9 +785,34 @@ class Worker
$stamp = (float)microtime(true);
$count = DBA::count('process', ['command' => 'Worker.php']);
self::$db_duration += (microtime(true) - $stamp);
self::$db_duration_count += (microtime(true) - $stamp);
return $count;
}
/**
* Returns the number of active worker processes
*
* @return array List of worker process ids
* @throws \Exception
*/
private static function getWorkerPIDList()
{
$ids = [];
$stamp = (float)microtime(true);
$queues = DBA::p("SELECT `process`.`pid`, COUNT(`workerqueue`.`pid`) AS `entries` FROM `process`
LEFT JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `workerqueue`.`done`
GROUP BY `process`.`pid`");
while ($queue = DBA::fetch($queues)) {
$ids[$queue['pid']] = $queue['entries'];
}
DBA::close($queues);
self::$db_duration += (microtime(true) - $stamp);
self::$db_duration_count += (microtime(true) - $stamp);
return $ids;
}
/**
* Returns waiting jobs for the current process id
*
@ -806,11 +834,11 @@ class Worker
/**
* Returns the next jobs that should be executed
*
* @param int $limit
* @return array array with next jobs
* @throws \Exception
*/
private static function nextProcess()
private static function nextProcess(int $limit)
{
$priority = self::nextPriority();
if (empty($priority)) {
@ -818,8 +846,6 @@ class Worker
return [];
}
$limit = DI::config()->get('system', 'worker_fetch_limit', 1);
$ids = [];
$stamp = (float)microtime(true);
$condition = ["`priority` = ? AND `pid` = 0 AND NOT `done` AND `next_try` < ?", $priority, DateTimeFormat::utcNow()];
@ -918,14 +944,29 @@ class Worker
*/
private static function findWorkerProcesses()
{
$mypid = getmypid();
$fetch_limit = DI::config()->get('system', 'worker_fetch_limit', 1);
$ids = self::nextProcess();
if (DI::config()->get('system', 'worker_multiple_fetch')) {
$pids = [];
foreach (self::getWorkerPIDList() as $pid => $count) {
if ($count <= $fetch_limit) {
$pids[] = $pid;
}
}
if (empty($pids)) {
return;
}
$limit = $fetch_limit * count($pids);
} else {
$pids = [getmypid()];
$limit = $fetch_limit;
}
// If there is no result we check without priority limit
if (empty($ids)) {
$limit = DI::config()->get('system', 'worker_fetch_limit', 1);
$ids = self::nextProcess($limit);
$limit -= count($ids);
// If there is not enough results we check without priority limit
if ($limit > 0) {
$stamp = (float)microtime(true);
$condition = ["`pid` = 0 AND NOT `done` AND `next_try` < ?", DateTimeFormat::utcNow()];
$tasks = DBA::select('workerqueue', ['id', 'parameter'], $condition, ['limit' => $limit, 'order' => ['priority', 'created']]);
@ -942,15 +983,28 @@ class Worker
DBA::close($tasks);
}
if (!empty($ids)) {
$stamp = (float)microtime(true);
$condition = ['id' => $ids, 'done' => false, 'pid' => 0];
DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow(), 'pid' => $mypid], $condition);
self::$db_duration += (microtime(true) - $stamp);
self::$db_duration_write += (microtime(true) - $stamp);
if (empty($ids)) {
return;
}
return !empty($ids);
// Assign the task ids to the workers
$worker = [];
foreach (array_unique($ids) as $id) {
$pid = next($pids);
if (!$pid) {
$pid = reset($pids);
}
$worker[$pid][] = $id;
}
$stamp = (float)microtime(true);
foreach ($worker as $worker_pid => $worker_ids) {
Logger::info('Set queue entry', ['pid' => $worker_pid, 'ids' => $worker_ids]);
DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow(), 'pid' => $worker_pid],
['id' => $worker_ids, 'done' => false, 'pid' => 0]);
}
self::$db_duration += (microtime(true) - $stamp);
self::$db_duration_write += (microtime(true) - $stamp);
}
/**
@ -973,17 +1027,11 @@ class Worker
}
self::$lock_duration += (microtime(true) - $stamp);
$found = self::findWorkerProcesses();
self::findWorkerProcesses();
DI::lock()->release(self::LOCK_PROCESS);
if ($found) {
$stamp = (float)microtime(true);
$r = DBA::select('workerqueue', [], ['pid' => getmypid(), 'done' => false]);
self::$db_duration += (microtime(true) - $stamp);
return DBA::toArray($r);
}
return false;
return self::getWaitingJobForPID();
}
/**

5
static/defaults.config.php
View file

@ -499,6 +499,11 @@ return [
// Setting 0 would allow maximum worker queues at all times, which is not recommended.
'worker_load_exponent' => 3,
// worker_multiple_fetch (Boolean)
// When activated, the worker fetches jobs for multiple workers (not only for itself).
// This is an experimental setting without knowing the performance impact.
'worker_multiple_fetch' => false,
// worker_defer_limit (Integer)
// Per default the systems tries delivering for 15 times before dropping it.
'worker_defer_limit' => 15,