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https://issues.apache.org/jira/browse/HADOOP-7951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179595#comment-13179595
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Daryn Sharp commented on HADOOP-7951:
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One possible/conceptual approach is viewfs issues a virtual-token. The real
token for the underlying mount point of a path would be dynamically acquired
on-demand and cached. The viewfs token's renewer would need to be aware of
these cached tokens so the renew/cancel methods operate on all acquired tokens.
The UGI would need to be updated to allow the ipc client to locate the tokens.
> viewfs fails unless all mount points are available
> --------------------------------------------------
>
> Key: HADOOP-7951
> URL: https://issues.apache.org/jira/browse/HADOOP-7951
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs, security
> Affects Versions: 0.24.0, 0.23.1
> Reporter: Daryn Sharp
> Priority: Critical
>
> Obtaining a delegation token via viewfs will attempt to acquire tokens from
> all filesystems in the mount table. All clients that obtain tokens,
> including job submissions, will fail if any of the mount points are
> unavailable -- even if paths in the unavailable mount will not be accessed.
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