title: How are WorkerHarnessThreads managed in Cloud Dataflow?
body: <p>Is the option <code>numberOfWorkerHarnessThreads</code> used by cloud-dataflow runner now?</p>
  
  <p>Earlier the <code>PipelineOptions</code> property <code>numberOfWorkerHarnessThreads</code> was specified in the <a href="https://cloud.google.com/dataflow/docs/guides/specifying-exec-params#configuring-pipelineoptions-for-execution-on-the-cloud-dataflow-service" rel="nofollow noreferrer">doc</a> and was displayed in Dataflow Job Monitoring UI under Pipeline options. Both are missing now.</p>
  
  <p>If this is not used, how are the worker threads managed now?</p>