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https://issues.apache.org/jira/browse/HADOOP-6988?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron T. Myers resolved HADOOP-6988.
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    Resolution: Won't Fix

Looks like we won't be reaching consensus on this issue. Closing out as it has 
long ago gone stale. Thanks for the thoughtful comments, everyone.

> Add support for reading multiple hadoop delegation token files
> --------------------------------------------------------------
>
>                 Key: HADOOP-6988
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6988
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>    Affects Versions: 0.22.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>         Attachments: hadoop-6988.0.txt, hadoop-6988.1.txt
>
>
> It would be nice if there were a way to specify multiple delegation token 
> files via the HADOOP_TOKEN_FILE_LOCATION environment variable and the 
> "mapreduce.job.credentials.binary" configuration value. I suggest a 
> colon-separated list of paths, each of which is read as a separate delegation 
> token file.

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