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From "zhangshilong (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (YARN-5969) FairShareComparator getResourceUsage poor performance
Date Wed, 21 Dec 2016 08:34:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-5969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15766471#comment-15766471
] 

zhangshilong edited comment on YARN-5969 at 12/21/16 8:34 AM:
--------------------------------------------------------------

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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