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https://issues.apache.org/jira/browse/YARN-3304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14379908#comment-14379908
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Karthik Kambatla commented on YARN-3304:
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My bad. I didn't realize one has to call updateProcessTree before calling 
getUsage. While I don't like the fact that one needs to call at least two 
methods to get a value in this API, I understand changing this might be a lot 
more involved. Given that updateProcessTree takes care of fetching the values 
and getUsage or isAvailable calls only access this pre-fetched value, I am okay 
with a boolean method or returning -1 with a marginal preference for the 
latter. 



> ResourceCalculatorProcessTree#getCpuUsagePercent default return value is 
> inconsistent with other getters
> --------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-3304
>                 URL: https://issues.apache.org/jira/browse/YARN-3304
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>            Reporter: Junping Du
>            Assignee: Karthik Kambatla
>            Priority: Blocker
>         Attachments: YARN-3304-v2.patch, YARN-3304.patch
>
>
> 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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