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https://issues.apache.org/jira/browse/MAPREDUCE-3825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203972#comment-13203972
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Daryn Sharp commented on MAPREDUCE-3825:
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bq. Good question. If this method is declared in FileSystem then ViewFileSystem
has to implement it and it cannot return single token - it has multiple tokens.
The fact that you will never ever call getDelegationToken on viewFileSystem and
always call getEmbeddedFileSystems() does not matter - ViewFileSystem has to
honor the contract for FileSystem since it extends it.
I'd suggest the distinct is that {{getDelegationToken}} requests a token
specifically for that filesystem. {{ViewFileSystem}} has no intrinsic tokens
so it honors the fs contract by returning null just like any other filesystem
with no tokens. OTOH, {{getDelegationTokens}} requests all tokens used by that
filesystem, which in turn calls {{getDelegationToken}} on the actual leaf
filesystems. Those leafs either return null or their token.
> 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
> Attachments: MAPREDUCE-3825.patch
>
>
> 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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