}

    private void recordOutputCancellation(boolean interruptIfRunning) {
      wasCancelled = true;
      // If all the futures were cancelled with interruption, cancel the input futures
      // with interruption; otherwise cancel without
      if (!interruptIfRunning) {
        shouldInterrupt = false;
      }
      recordCompletion();
    }

    * In order to safely upgrade an existing Kubernetes cluster without interruption of volume attach/detach logic:
        * First upgrade the master to Kubernetes v1.3.
            * This will start the new attach/detach controller.