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https://issues.apache.org/jira/browse/HADOOP-5154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675135#action_12675135
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Matei Zaharia commented on HADOOP-5154:
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We can change runningJobs to getRunningJobs. Where do you see scheduler APIs
being used without a lock though?
> 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
>
>
> This happened while trying to change the priority of a job from the scheduler
> servlet.
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