count := len(revisions)
	if count <= 0 {
		return 1
	}
	return revisions[count-1].Revision + 1
}

// inconsistentStatus returns true if the ObservedGeneration of status is greater than set's
// Generation or if any of the status's fields do not match those of set's status.
func inconsistentStatus(set *apps.StatefulSet, status *apps.StatefulSetStatus) bool {
	return status.ObservedGeneration > set.Status.ObservedGeneration ||

	status *apps.StatefulSetStatus) error {
	// complete any in progress rolling update if necessary
	completeRollingUpdate(set, status)

	// if the status is not inconsistent do not perform an update
	if !inconsistentStatus(set, status) {
		return nil
	}

	// copy set and update its status
	set = set.DeepCopy()
	if err := ssc.statusUpdater.UpdateStatefulSetStatus(ctx, set, status); err != nil {
		return err
	}