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https://issues.apache.org/jira/browse/HADOOP-5154?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matei Zaharia updated HADOOP-5154:
----------------------------------

    Attachment: hadoop-5154-v4.patch

Updated patch to take into account your comments. I chose to call 
getRunningJobs before locking the scheduler (thus locking the JT alone, which 
is fine). It returns a new list so it should be okay to iterate through this 
list later.

> 4-way deadlock in FairShare scheduler
> -------------------------------------
>
>                 Key: HADOOP-5154
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5154
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/fair-share
>            Reporter: Vinod K V
>            Assignee: Matei Zaharia
>            Priority: Blocker
>             Fix For: 0.18.4, 0.20.0
>
>         Attachments: FairSchedulerDeadLock.txt, hadoop-5154-v0.patch, 
> hadoop-5154-v1.patch, hadoop-5154-v2.patch, hadoop-5154-v3.patch, 
> hadoop-5154-v4.patch
>
>
> This happened while trying to change the priority of a job from the scheduler 
> servlet.

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