Enqueued tasks are not started when a process class with a limit is assigned to more than one job

Current Situation

• We assume that we have two jobs which are used with the same process class.
• The jobs can start more than one task in parallel but the process class has the limit max_processes=1.
• The first job is started (manually) and while this task is running the second job is started and the first job is started once more.
• Then both jobs get the status waiting_for_process="yes" because of the process class limit and the job starts are enqueued.
• If the first running task is finished then
  • none of the enqueued tasks are started
  • the second job has still the status waiting_for_process="yes"
  • every further job start are only enqueued and not started even if the task queue was cleared before.

Desired Behavior

• Enqueued tasks should be started

Workaround

• Modify the max. number of tasks in the process class to a value that is not reached.
• Example:

       <process_class  max_processes="100"/>