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https://issues.apache.org/jira/browse/MAPREDUCE-1550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Devaraj Das updated MAPREDUCE-1550:
-----------------------------------

    Attachment: 1550-1.patch

This fixes the problem. The problem is that, in a secure env, the 
FileSystem.get() would require user's credentials to talk to the NameNode if 
the get() was done within a UGI.doAs. Removing the doAs would mean that the 
JobTracker's credentials would be used which is the right thing to do since the 
JobHistory files are owned by the JobTracker anyway..

> UGI.doAs should not be used for getting the history file of jobs
> ----------------------------------------------------------------
>
>                 Key: MAPREDUCE-1550
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1550
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>    Affects Versions: 0.22.0
>            Reporter: Devaraj Das
>             Fix For: 0.22.0
>
>         Attachments: 1550-1.patch
>
>
> When the jobtracker tries to open a job history file it does a doAs to get 
> the filesystem for the user (that had submitted the job). This should not be 
> done since the job history files are owned by the jobtracker.

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