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https://issues.apache.org/jira/browse/YARN-5969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15766471#comment-15766471
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zhangshilong edited comment on YARN-5969 at 12/21/16 8:34 AM:
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ContainerAllocated picture means container allocation per minute.
After patch, Container allocation per minute improves about 50%.
obviously, 500 apps finish faster after patch.
was (Author: zsl2007):
ContainerAllocated picture means container allocation per minute.
After patch, Container allocation per minute improves about 50%.
> 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, 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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