Stopping gearman workers nicely

Question

I have a number of Gearman workers running constantly, saving things like records of user page views, etc. Occasionally, I\'ll update the PHP code that is used by the Gearman w

Answer 1

I use following code which supports both Ctrl-C and kill -TERM. By default supervisor sends TERM signal if have not modified signal= setting. In PHP 5.3+ declare(ticks = 1) is deprecated, use pcntl_signal_dispatch() instead.

$terminate = false;
pcntl_signal(SIGINT, function() use (&$terminate)
{
    $terminate = true;
});
pcntl_signal(SIGTERM, function() use (&$terminate)
{
    $terminate = true;
});

$worker = new GearmanWorker();
$worker->addOptions(GEARMAN_WORKER_NON_BLOCKING);
$worker->setTimeout(1000);
$worker->addServer('127.0.0.1', 4730);
$worker->addFunction('reverse', function(GearmanJob $job)
{
    return strrev($job->workload());
});

$count = 500 + rand(0, 100); // rand to prevent multple workers restart at same time
for($i = 0; $i < $count; $i++)
{
    if ( $terminate )
    {
        break;
    }
    else
    {
        pcntl_signal_dispatch();
    }

    $worker->work();

    if ( $terminate )
    {
        break;
    }
    else
    {
        pcntl_signal_dispatch();
    }

    if ( GEARMAN_SUCCESS == $worker->returnCode() )
    {
        continue;
    }

    if ( GEARMAN_IO_WAIT != $worker->returnCode() && GEARMAN_NO_JOBS != $worker->returnCode() )
    {
        $e = new ErrorException($worker->error(), $worker->returnCode());
        // log exception
        break;
    }

    $worker->wait();
}

$worker->unregisterAll();