JobTracker.submitJob holds a lock on the JobTracker while copying job-conf from 
HDFS
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                 Key: MAPREDUCE-1472
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1472
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: jobtracker
            Reporter: Arun C Murthy
            Assignee: Arun C Murthy
            Priority: Blocker


This could have very bad impact on responsiveness of the cluster.

JobTracker.submitJob also forks a DU and writes to it's local-disk.

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