Wangda Tan created YARN-3098:

             Summary: Create common QueueCapacities class in Capacity Scheduler 
to track capacities-by-labels of queues
                 Key: YARN-3098
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: capacityscheduler
            Reporter: Wangda Tan
            Assignee: Wangda Tan

Similar to YARN-3092, after YARN-796, now queues (ParentQueue and LeafQueue) 
need to track capacities-label (e.g. absolute-capacity, maximum-capacity, 
absolute-capacity, absolute-maximum-capacity, etc.). It's better to have a 
class to encapsulate these capacities to make both better 
maintainability/readability and fine-grained locking.

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