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https://issues.apache.org/jira/browse/HADOOP-1873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12529695
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Allen Wittenauer commented on HADOOP-1873:
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Yes, Kerberos tickets have timeouts.  In fact, it is ultra-important that MR 
jobs be able to autorenew any renewable tickets they are passed.  

> User permissions for Map/Reduce
> -------------------------------
>
>                 Key: HADOOP-1873
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1873
>             Project: Hadoop
>          Issue Type: Improvement
>            Reporter: Raghu Angadi
>            Assignee: Raghu Angadi
>
> HADOOP-1298 and HADOOP-1701 add permissions and pluggable security for DFS 
> files and DFS accesses. Same users permission should work for Map/Reduce jobs 
> as well. 
> User persmission should propegate from client to map/reduce tasks and all the 
> file operations should be subject to user permissions. This is transparent to 
> the user (i.e. no changes to user code should be required). 

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