Wangda Tan created YARN-3092:

             Summary: Create common resource usage class to track labeled 
resource/capacity in Capacity Scheduler
                 Key: YARN-3092
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Wangda Tan
            Assignee: Wangda Tan

Since we have labels on nodes, so we need to track resource usage *by labels*, 
- AM resource (to enforce max-am-resource-by-label after YARN-2637)
- Used resource (includes AM resource usage)
- Reserved resource
- Pending resource
- Headroom

Benefits to have such a common class are:
- Reuse lots of code in different places (Queue/App/User), better 
maintainability and readability.
- Can make fine-grained locking (e.g. accessing used resource in a queue 
doesn't need lock a queue)

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