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https://issues.apache.org/jira/browse/MAPREDUCE-1599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871425#action_12871425
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Jitendra Nath Pandey commented on MAPREDUCE-1599:
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test patch results

     [exec] +1 overall.  
     [exec] 
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec] 
     [exec]     +1 tests included.  The patch appears to include 3 new or 
modified tests.
     [exec] 
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning 
messages.
     [exec] 
     [exec]     +1 javac.  The applied patch does not increase the total number 
of javac compiler warnings.
     [exec] 
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs 
warnings.
     [exec] 
     [exec]     +1 release audit.  The applied patch does not increase the 
total number of release audit warnings.


> MRBench reuses jobConf and credentials there in.
> ------------------------------------------------
>
>                 Key: MAPREDUCE-1599
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1599
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Jitendra Nath Pandey
>            Assignee: Jitendra Nath Pandey
>         Attachments: MR-1599-y20.1.patch, MR-1599.2.patch
>
>
> MRBench reuses the jobconf and therefore credentials are re-used, but 
> JobTracker cancels the delegation tokens therefore the test fails sometimes. 
> The fix is to pass the mapreduce.job.complete.cancel.delegation.tokens=false 
> in the jobconf so that JobTracker does not cancel the tokens.

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