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Posted to yarn-issues@hadoop.apache.org by "Yufei Gu (JIRA)" <ji...@apache.org> on 2017/03/18 06:59:41 UTC
[jira] [Assigned] (YARN-6361) FairScheduler:
FSLeafQueue.fetchAppsWithDemand CPU usage is high with big queues
[ https://issues.apache.org/jira/browse/YARN-6361?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Yufei Gu reassigned YARN-6361:
------------------------------
Assignee: Yufei Gu
> 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: Bug
> Reporter: Miklos Szegedi
> Assignee: Yufei Gu
> 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\(n\))}}.
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