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https://issues.apache.org/jira/browse/MAPREDUCE-3825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202742#comment-13202742
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Sanjay Radia commented on MAPREDUCE-3825:
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Note the FileSystem interface was changed specifically to deal with
multiple-filesystem file systems like viewfs (ie it returns an arrays of tokens
not a single token).
So the question is: what is broken?
* The fact that the token cache is keyed by file system uri or
* That FileSystem has a method called getDelegationTokens and not a method
called getEmbeddedFileSystems().
When we changed from getDelegationToken() to getDelegationTokens() we had
dismissed the alternate you are proposing since we needed a method to get
delegation token from a file system anyway.
> Need generalized multi-token filesystem support
> -----------------------------------------------
>
> Key: MAPREDUCE-3825
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3825
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: security
> Affects Versions: 0.23.1, 0.24.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
>
> This is the counterpart to HADOOP-7967. The token cache currently tries to
> assume a filesystem's token service key. The assumption generally worked
> while there was a one to one mapping of filesystem to token. With the advent
> of multi-token filesystems like viewfs, the token cache will try to use a
> service key (ie. for viewfs) that will never exist (because it really gets
> the mounted fs tokens).
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