code: void sendAsync(final RunningTask reefTask, final MasterToWorkerRequest masterToWorkerRequest) {
      executorService.execute(new Runnable() {
        @Override
        public void run() {
          //  Possible race condition with VortexWorkerManager#terminate is addressed by the global lock in VortexMaster
          send(reefTask, masterToWorkerRequest);
        }
      });
    }
docs: Sends a {@link MasterToWorkerRequest} asynchronously to a {@link org.apache.reef.vortex.evaluator.VortexWorker}.