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From "Vinod K V (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5285) JobTracker hangs for long periods of time
Date Thu, 19 Feb 2009 12:16:01 GMT
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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