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https://issues.apache.org/jira/browse/HADOOP-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675320#action_12675320
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Devaraj Das commented on HADOOP-5285:
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Both ant test and test-patch passed locally.
> JobTracker hangs for long periods of time
> -----------------------------------------
>
> Key: HADOOP-5285
> URL: https://issues.apache.org/jira/browse/HADOOP-5285
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.20.0
> Reporter: Vinod K V
> Assignee: Devaraj Das
> Priority: Blocker
> Fix For: 0.20.0
>
> Attachments: 5285.patch, trace.txt
>
>
> On one of the larger clusters of 2000 nodes, JT hanged quite often, sometimes
> for times in the order of 10-15 minutes and once for one and a half hours(!).
> The stack trace shows that JobInProgress.obtainTaskCleanupTask() is waiting
> for lock on JobInProgress object which JobInProgress.initTasks() is holding
> for a long time waiting for DFS operations.
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