Wangda Tan created YARN-6244:
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             Summary: Introduce AtomicResource in ResourceUsage to avoid read-write lock.
                 Key: YARN-6244
                 URL: https://issues.apache.org/jira/browse/YARN-6244
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Wangda Tan


While doing SLS tests of YARN-5139, I found when multiple threads are doing scheduling at the same time, read/write lock of ResourceUsage becomes bottleneck. This could be improved.



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