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Posted to mapreduce-issues@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2012/11/01 21:07:12 UTC
[jira] [Commented] (MAPREDUCE-4765) Restarting the JobTracker
programmatically can cause DelegationTokenRenewal to throw an exception
[ https://issues.apache.org/jira/browse/MAPREDUCE-4765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13488986#comment-13488986 ]
Hadoop QA commented on MAPREDUCE-4765:
--------------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12551752/MAPREDUCE-4765_branch-1.patch
against trunk revision .
{color:red}-1 patch{color}. The patch command could not apply the patch.
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2979//console
This message is automatically generated.
> 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
>
>
> 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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