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From "Robert Kanter (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4765) Restarting the JobTracker programmatically can cause DelegationTokenRenewal to throw an exception
Date Thu, 01 Nov 2012 19:45:12 GMT
Robert Kanter created MAPREDUCE-4765:
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             Summary: Restarting the JobTracker programmatically can cause DelegationTokenRenewal
to throw an exception
                 Key: MAPREDUCE-4765
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4765
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: jobtracker, mrv1
    Affects Versions: 1.1.0
            Reporter: Robert Kanter
            Assignee: Robert Kanter
            Priority: Minor
             Fix For: 1.2.0


The DelegationTokenRenewal class has a global Timer; when you stop the JobTracker by calling
{{stopTracker()}} on it (or {{stopJobTracker()}} in MiniMRCluster), the JobTracker will call
{{close()}} on DelegationTokenRenewal, which cancels the Timer.  If you then start up the
JobTracker again by calling {{startTracker()}} on it (or {{startJobTracker()}} in MiniMRCluster),
the Timer won't necessarily be re-created; and DelegationTokenRenewal will later throw an
exception when it tries to use the Timer again (because you can't reuse a canceled Timer).
 

DelegationTokenRenewal doesn't seem to be used in trunk, so we only need this for branch-1

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