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Date: Tue, 6 Nov 2012 18:44:12 +0000 (UTC)
From: "Alejandro Abdelnur (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-4765) Restarting the JobTracker
 programmatically can cause DelegationTokenRenewal to throw an exception
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-4765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491698#comment-13491698 ] 

Alejandro Abdelnur commented on MAPREDUCE-4765:
-----------------------------------------------

+1
                
> 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
>
>         Attachments: MAPREDUCE-4765_branch-1.patch, MAPREDUCE-4765_branch-1.patch
>
>
> 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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