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Suppose that you have a bolt whose tasks are not thread safe but you
still want parallelism.  It seems that this could be achieved via
multiprocessing by forcing a maximium of 1 executor per worker.  With
this constraint, if you chose a parallelism hint of 4 (with default
executors) you would get 4 tasks in 4 executors each running in a
separate worker.  Can this constraint be configured?

Thanks,
Marc