I started using php-resque (https://github.com/chrisboulton/php-resque) along with php and mysql server. I am seeing "MySQL server has gone away" errors by the workers.
Job queuing code:
if ($request->command == 'custom_script') {
//error_log("before queue");
Resque::enqueue($queue, 'AsyncTest', array('text'=>'yolo'));
//error_log("after queue");
}
Job class:
class AsyncTest{
public function setUp() {
# Set up something before perform, like establishing a database connection
$mysql = Mysql::getInstance();
EH::setErrorHandler();
}
public function perform()
{
// $mysql = Mysql::getInstance();
// EH::setErrorHandler();
//error_log($this->args['text']);
$haiku_step_query= $mysql->query("SELECT id FROM haiku LIMIT 10 OFFSET 1");
$row = $mysql->fetch_assoc($haiku_step_query);
$haiku_id = $row['id'];
}
public function tearDown() {
# Run after perform, like closing resources
}
}
I see "MySQL server has gone away" error messages:
MySQL ERROR №2006 MySQL server has gone away[qs:SELECT id FROM haiku LIMIT 10 OFFSET 1]
(/var/www/html/haiku_server/vendor/chrisboulton/php-resque/resque.php line 77
Resque_Worker->work(5) >> /var/www/html/haiku_server/vendor/chrisboulton/php-resque/lib/Resque/Worker.php line 199
Resque_Worker->perform(Object) >> /var/www/html/haiku_server/vendor/chrisboulton/php-resque/lib/Resque/Worker.php line 237
Resque_Job->perform() >> /var/www/html/haiku_server/vendor/chrisboulton/php-resque/lib/Resque/Job.php line 182
AsyncTest->perform() >> /var/www/html/haiku_server/includes/bgJobs/AsyncThreads.php line 48
Mysql->query("SELECT id FROM haiku LIMIT 10 OFFSET 1") >> /var/www/html/haiku_server/includes/Mysql.class.php line 113 )
Please note that this does not happen, that is mysql works fine, when I do the operation whitout php-resque, like:
if ($request->command == 'custom_script') {
$mysql = Mysql::getInstance();
EH::setErrorHandler();
$haiku_step_query= $mysql->query("SELECT id FROM haiku LIMIT 10 OFFSET 1");
$row = $mysql->fetch_assoc($haiku_step_query);
$haiku_id = $row['id'];
}
Take a look at this issue: https://github.com/chrisboulton/php-resque/issues/269
A possible cause is because after the job runs for the first time, your objects will stay loaded in memory, including your MySQL connection. A solution is to reconnect to MySQL in your perform method.