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https://issues.apache.org/jira/browse/HADOOP-6988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12918145#action_12918145
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Owen O'Malley commented on HADOOP-6988:
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The environment variable should *not* be multi-valued. It is used to
communicate the job's token store to sub-processes of the task. Since a task
can't be in more than one job, there isn't any need.
What is the use case for having multiple token files? The rest of the lists use
commas, so this should be the same. Wouldn't it be easier to write a tool that
allows you to combine multiple token files together into a single one?
> 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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