Junping Du created YARN-3304:

             Summary: Default return values for resources in 
ResourceCalculatorProcessTree are inconsistent in case where functionality is 
not available.
                 Key: YARN-3304
                 URL: https://issues.apache.org/jira/browse/YARN-3304
             Project: Hadoop YARN
          Issue Type: Bug
          Components: nodemanager
            Reporter: Junping Du

Per discussions in YARN-3296, getCpuUsagePercent() will return -1 for 
unavailable case while other resource metrics are return 0 in the same case 
which sounds inconsistent.

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