public void handleManagerDeparture(InternalDistributedMember theId) {
    if (serialQueuedExecutorPool != null) {
      serialQueuedExecutorPool.handleMemberDeparture(theId);
    }
  }
Wait for the ancillary queues to exit. Kills them if they are still around.
geode-core/src/main/java/org/apache/geode/distributed/internal/ClusterOperationExecutors.java