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https://issues.apache.org/jira/browse/HADOOP-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12674980#action_12674980
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Vinod K V commented on HADOOP-5285:
-----------------------------------
I just realized that we might also want to fix HADOOP-4375 as part of this
jira; this is related to locking of JT when accessing CompletedJobStore.
> 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
> Priority: Blocker
> Fix For: 0.20.0
>
>
> 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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