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https://issues.apache.org/jira/browse/YARN-6361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16115205#comment-16115205
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YunFan Zhou edited comment on YARN-6361 at 8/5/17 1:49 AM:
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[~yufeigu] Thank Yufei.
Sorry, I'm off the subject. But either way, the efficiency of raising the
*fetchAppsWithDemand* is something that must be done. I have thought about the
optimal method for two days and tested my thoughts today.
Thank you very much for your confidence in me.
was (Author: daemon):
[~yufeigu] Thank Yufei.
Sorry, I'm off the subject. But either way, the efficiency of raising the
*fetchAppsWithDemand *is something that must be done. I have thought about the
optimal method for two days and tested my thoughts today.
Thank you very much for your confidence in me.
> 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
> Priority: Minor
> Attachments: dispatcherthread.png, threads.png
>
>
> 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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