Only 1 worker per group on CakePHP Queue Plugin

Need Help
1

I wrote some tasks using the CakePHP queue

My current config is:

    'workermaxruntime' => 0,
    'maxworkers' => 1,

My jobs are separated by group and I expect to have 1 and only 1 worker per group running 24/7. Is there any way to achieve this?

2

maxworkers is the total amount of workers which are allowed to be run on your whole server, no matter which group.

So if you have 4 groups of tasks which should be worked on in parallel this should be 4 so you can start 1 worker per group with bin/cake queue run -g Group1, bin/cake queue run -g Group2 etc.

As far as I can tell there is no limitation to only run 1 worker per group. You have to make sure this doesn’t happen by yourself.

What I like to do to prevent specific jobs being executed in parallel is to add a check like

$currentJob = $this->QueuedJobs->get($jobId);
$runningJobs = $this->QueuedJobs->find()
    ->where([
        'job_task' => 'MyTaskName',
        'reference' => $currentJob->reference,
        'workerkey IS NOT' => null,
        'id IS NOT' => $jobId,
        'completed IS' => null,
    ])
    ->first();

if ($runningJobs instanceof QueuedJob) {
    throw new \RuntimeException(__('Some telling message!'));
}

at the start of the task.

Depending on your set $retries property (and queue config) in the task this can then be refetched later again but you have to trial and error that for yourself.