max parallel execution configurable for each queue #872
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This change with another on delayed_job_active_record permits to configure a limit of concurrent execution of a queue.
Follows an example of configuration in the config/initializers/delayed_job.rb where "import" and "export" are queue names.
Delayed::Worker.default_max_workers_by_queue = 3
Delayed::Worker.max_workers_by_queue = {"import" => 1, "export" => 2}
This configuration permits to optimize the use of the workers, and in the same time to control that one queue don't take all available workers or that two jobs from one specific queue could not be execute in the same time.