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https://issues.apache.org/jira/browse/MAPREDUCE-3639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13182942#comment-13182942
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Daryn Sharp commented on MAPREDUCE-3639:
----------------------------------------

I think you can use {{NetUtils.addStaticResolution}} to dummy out the lookups 
of "host".

bq. That check should not be present. getCanonicalServiceName will return null 
for filesystems like viewfs. With that additional check - TokenCache will not 
get tokens for the underlying filesystems.

Sigh, that's right, and one of the things I was trying to fix in an alt patch.  
The view fs token caching is getting quite murky, but this at least makes it 
work better, so +1...
                
> TokenCache likely broken for FileSystems which don't issue delegation tokens
> ----------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3639
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3639
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>            Priority: Blocker
>         Attachments: MR3639.txt
>
>
> Ref HADOOP-7963.

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