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https://issues.apache.org/jira/browse/YARN-6361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16115831#comment-16115831
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Hadoop QA commented on YARN-6361:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  5s{color} 
| {color:red} YARN-6361 does not apply to trunk. Rebase required? Wrong Branch? 
See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | YARN-6361 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12880568/YARN-6361.001.pre.patch
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| Console output | 
https://builds.apache.org/job/PreCommit-YARN-Build/16726/console |
| Powered by | Apache Yetus 0.6.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> FairScheduler: FSLeafQueue.fetchAppsWithDemand CPU usage is high with big 
> queues
> --------------------------------------------------------------------------------
>
>                 Key: YARN-6361
>                 URL: https://issues.apache.org/jira/browse/YARN-6361
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Miklos Szegedi
>            Assignee: YunFan Zhou
>         Attachments: dispatcherthread.png, threads.png, 
> YARN-6361.001.pre.patch
>
>
> FSLeafQueue.fetchAppsWithDemand sorts the applications by the current policy. 
> Most of the time is spent in FairShareComparator.compare. We could improve 
> this by doing the calculations outside the sort loop {{(O\(n\))}} and we 
> sorted by a fixed number inside instead {{O(n*log\(n\))}}. This could be an 
> performance issue when there are huge number of applications in a single 
> queue. The attachments shows the performance impact when there are 10k 
> applications in one queue.



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