// State set when resize controller has finished resizing the volume but further resizing of volume
	// is needed on the node.
	PersistentVolumeClaimNodeResizePending ClaimResourceStatus = "NodeResizePending"
	// State set when kubelet starts resizing the volume.
	PersistentVolumeClaimNodeResizeInProgress ClaimResourceStatus = "NodeResizeInProgress"

		fsVolume, _ := util.CheckVolumeModeFilesystem(volumeSpec)
		// No Cloudprovider resize needed, lets mark resizing as done
		// Rest of the volume expand controller code will assume PVC as *not* resized until pvc.Status.Size
		// reflects user requested size.
		if !volumePlugin.RequiresFSResize() || !fsVolume {
			klog.V(4).Infof("Controller resizing done for PVC %s", util.GetPersistentVolumeClaimQualifiedName(pvc))

	// SetPodAllocation checkpoints the resources allocated to a pod's containers.
	SetPodAllocation(pod *v1.Pod) error

	// SetPodResizeStatus checkpoints the last resizing decision for the pod.
	SetPodResizeStatus(podUID types.UID, resize v1.PodResizeStatus) error
}

const syncPeriod = 10 * time.Second

// NewManager returns a functional Manager.

   *
   * @param expectedSize the number of elements you expect to add to the returned set
   * @return a new, empty {@code CompactHashSet} with enough capacity to hold {@code expectedSize}
   *     elements without resizing
   * @throws IllegalArgumentException if {@code expectedSize} is negative
   */
  public static <E extends @Nullable Object> CompactHashSet<E> createWithExpectedSize(
      int expectedSize) {

    Iterators.addAll(set, elements);
    return set;
  }

  /**
   * Returns a new hash set using the smallest initial table size that can hold {@code expectedSize}
   * elements without resizing. Note that this is not what {@link HashSet#HashSet(int)} does, but it
   * is what most users want and expect it to do.
   *
   * <p>This behavior can't be broadly guaranteed, but has been tested with OpenJDK 1.7 and 1.8.

   *
   * @param expectedSize the number of elements you expect to add to the returned set
   * @return a new, empty {@code CompactHashSet} with enough capacity to hold {@code expectedSize}
   *     elements without resizing
   * @throws IllegalArgumentException if {@code expectedSize} is negative
   */
  public static <E extends @Nullable Object> CompactHashSet<E> createWithExpectedSize(
      int expectedSize) {

	// State set when resize controller has finished resizing the volume but further resizing of volume
	// is needed on the node.
	PersistentVolumeClaimNodeResizePending ClaimResourceStatus = "NodeResizePending"
	// State set when kubelet starts resizing the volume.
	PersistentVolumeClaimNodeResizeInProgress ClaimResourceStatus = "NodeResizeInProgress"

	// If resize results in net pod resource increase, set pod cgroup config before resizing containers.
	// If resize results in net pod resource decrease, set pod cgroup config after resizing containers.
	// If an error occurs at any point, abort. Let future syncpod iterations retry the unfinished stuff.

ControllerResizeInProgress:\n\t\tState set when resize controller starts resizing the volume in control-plane.\n\t- ControllerResizeFailed:\n\t\tState set when resize has failed in resize controller with a terminal error.\n\t- NodeResizePending:\n\t\tState set when resize controller has finished resizing the volume but further resizing of\n\t\tvolume is needed on the node.\n\t- NodeResizeInProgress:\n\t\tState set when kubelet starts resizing the volume.\n\t- NodeResizeFailed:\n\t\tState set when resizing...

  // 	- ControllerResizeInProgress:
  // 		State set when resize controller starts resizing the volume in control-plane.
  // 	- ControllerResizeFailed:
  // 		State set when resize has failed in resize controller with a terminal error.
  // 	- NodeResizePending:
  // 		State set when resize controller has finished resizing the volume but further resizing of
  // 		volume is needed on the node.
  // 	- NodeResizeInProgress: