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https://issues.apache.org/jira/browse/HADOOP-6988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12918419#action_12918419
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Allen Wittenauer commented on HADOOP-6988:
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I'm sorry, but it is completely short sighted to have a single use env var like
this. If we need to modify the tasks environment for something else, are we
going to introduce another environment variable? How many are too many?
> 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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