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https://issues.apache.org/jira/browse/MAPREDUCE-4765?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Kanter updated MAPREDUCE-4765:
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Attachment: MAPREDUCE-4765_branch-1.patch
The new patch addresses Alejandro's comments. I've checked for null before
canceling and I've made the test call testDTRenewal() before closing the DTR
timer (I had assumed it would always run before my new test, but that may not
always be the case).
> 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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