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https://issues.apache.org/jira/browse/YARN-5969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15766437#comment-15766437
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zhangshilong commented on YARN-5969:
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Test case： 500 app，3000 nm nodes
queue:
parent queue number: 100
leaf queue number per parent queue: 5
500 apps submitted to 155 leaf queues. Average queue contains 4 apps.
all apps are mapreduce job. One job contains 325 mapper and 44 reducer. Every
mapper/reducer does: sleep 20 seconds.
> FairShareComparator getResourceUsage poor 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
>
>
> 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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