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From "Varun Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (YARN-3508) Preemption processing occuring on the main RM dispatcher
Date Mon, 20 Apr 2015 16:27:59 GMT

     [ https://issues.apache.org/jira/browse/YARN-3508?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Varun Saxena reassigned YARN-3508:
----------------------------------

    Assignee: Varun Saxena

> Preemption processing occuring on the main RM dispatcher
> --------------------------------------------------------
>
>                 Key: YARN-3508
>                 URL: https://issues.apache.org/jira/browse/YARN-3508
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager, scheduler
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Varun Saxena
>
> We recently saw the RM for a large cluster lag far behind on the AsyncDispacher event
queue.  The AsyncDispatcher thread was consistently blocked on the highly-contended CapacityScheduler
lock trying to dispatch preemption-related events for RMContainerPreemptEventDispatcher. 
Preemption processing should occur on the scheduler event dispatcher thread or a separate
thread to avoid delaying the processing of other events in the primary dispatcher queue.



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