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https://issues.apache.org/jira/browse/HADOOP-6988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12918053#action_12918053
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Aaron T. Myers commented on HADOOP-6988:
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Thanks for the comments, Allen.
The environment variable already exists in hadoop trunk; it's just only capable
of specifying a single path to a token file. I'd like to be able to specify
multiple token files via this variable. This is really only for convenience, as
it's entirely possible to stuff multiple delegation token objects into a single
credentials object, which is then serialized to a file. I considered creating a
tool which would be capable of merging multiple delegation token files into
one, but this seemed like a cleaner solution.
> 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
>
> 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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