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Posted to yarn-issues@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2015/04/14 23:37:59 UTC

[jira] [Updated] (YARN-3487) CapacityScheduler.getQueueInfo grabs scheduler lock unnecessarily

     [ https://issues.apache.org/jira/browse/YARN-3487?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jason Lowe updated YARN-3487:
-----------------------------
    Attachment: YARN-3487.001.patch

Patch that removes the synchronization around the ConcurrentHashMap access.

> CapacityScheduler.getQueueInfo grabs scheduler lock unnecessarily
> -----------------------------------------------------------------
>
>                 Key: YARN-3487
>                 URL: https://issues.apache.org/jira/browse/YARN-3487
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: YARN-3487.001.patch
>
>
> Recently saw a significant slowdown of applications on a large cluster, and we noticed there were a large number of blocked threads on the RM.  Most of the blocked threads were waiting for the CapacityScheduler lock while calling getQueueInfo.



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