}

    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();
    }

   * @return {@code false} if the step could not be cancelled, typically because it has already
   *     completed normally; {@code true} otherwise
   */
  @CanIgnoreReturnValue
  @SuppressWarnings("Interruption") // We are propagating an interrupt from a caller.
  public boolean cancel(boolean mayInterruptIfRunning) {
    logger.get().log(FINER, "cancelling {0}", this);
    boolean cancelled = future.cancel(mayInterruptIfRunning);

    * 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.