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Date: Thu, 1 Nov 2012 19:45:12 +0000 (UTC)
From: "Robert Kanter (JIRA)" <jira@apache.org>
To: mapreduce-dev@hadoop.apache.org
Message-ID: <1650771963.57544.1351799112612.JavaMail.jiratomcat@arcas>
Subject: [jira] [Created] (MAPREDUCE-4765) Restarting the JobTracker
 programmatically can cause DelegationTokenRenewal to throw an exception
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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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