code: public void start() throws Exception
      {
          Preconditions.checkState(state.compareAndSet(State.LATENT, State.STARTED), "Cannot be started more than once");
  
          if ( leaderLatch != null && ownsLeaderLatch)
          {
              leaderLatch.start();
          }
      }
docs: The reaper must be started
  
  @throws Exception errors