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https://issues.apache.org/jira/browse/HADOOP-5154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12669520#action_12669520
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Vinod K V commented on HADOOP-5154:
-----------------------------------
It's actually a 2-way deadlock. The JT UI and FairScheduler.assignTasks also
got locked up while trying to obtain the lock on JT object.
> 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
> Attachments: FairSchedulerDeadLock.txt
>
>
> This happened while trying to change the priority of a job from the scheduler
> servlet.
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