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From "Suma Shivaprasad (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3346) Deadlock in Capacity Scheduler
Date Thu, 12 Mar 2015 23:55:38 GMT

    [ https://issues.apache.org/jira/browse/YARN-3346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14359644#comment-14359644
] 

Suma Shivaprasad commented on YARN-3346:
----------------------------------------

>From the jstack, it appears that trying to access resource usage report in RM UI is causing
the deadlock.

> Deadlock in Capacity Scheduler
> ------------------------------
>
>                 Key: YARN-3346
>                 URL: https://issues.apache.org/jira/browse/YARN-3346
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 2.6.0
>            Reporter: Suma Shivaprasad
>         Attachments: rm.deadlock_jstack
>
>
> {noformat}
> Found one Java-level deadlock:
> =============================
> "2144051991@qtp-383501499-6":
>   waiting to lock monitor 0x00007fa700eec8e8 (object 0x00000004589fec18, a org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp),
>   which is held by "ResourceManager Event Processor"
> "ResourceManager Event Processor":
>   waiting to lock monitor 0x00007fa700aadf88 (object 0x0000000441c05ec8, a org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue),
>   which is held by "IPC Server handler 0 on 54311"
> "IPC Server handler 0 on 54311":
>   waiting to lock monitor 0x00007fa700e20798 (object 0x0000000441d867f8, a org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue),
>   which is held by "ResourceManager Event Processor"
> {noformat}



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