private void askThreadsToStop() {
    executors.askThreadsToStop();

    Thread th = memberEventThread;
    if (th != null) {
      th.interrupt();
    }
  }
Informs other members that this dm is shutting down. Stops the pusher, puller, and processor
threads and closes the connection to the transport layer.
geode-core/src/main/java/org/apache/geode/distributed/internal/ClusterDistributionManager.java