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https://issues.apache.org/jira/browse/YARN-5969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karthik Kambatla updated YARN-5969:
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Summary: FairShareComparator: Cache value of getResourceUsage for better
performance (was: FairShareComparator getResourceUsage poor performance)
> FairShareComparator: Cache value of getResourceUsage for better performance
> ---------------------------------------------------------------------------
>
> Key: YARN-5969
> URL: https://issues.apache.org/jira/browse/YARN-5969
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: fairscheduler
> Affects Versions: 2.7.1
> Reporter: zhangshilong
> Assignee: zhangshilong
> Attachments: 20161206.patch, 20161222.patch, YARN-5969.patch,
> apprunning_after.png, apprunning_before.png,
> containerAllocatedDelta_before.png, containerAllocated_after.png,
> pending_after.png, pending_before.png
>
>
> in FairShareComparator class, the performance of function getResourceUsage()
> is very poor. It will be executed above 100,000,000 times per second.
> In our scene, It takes 20 seconds per minute.
> A simple solution is to reduce call counts of the function.
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