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https://issues.apache.org/jira/browse/MAPREDUCE-3825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13207317#comment-13207317
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Sanjay Radia commented on MAPREDUCE-3825:
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On the backward compatibility issue for existing external file systems that
extend FileSystem.
Both getFileSystems() and addDelegationTokens(renewer, cred) will break file
systems that have multiple
file systems in them. So I don't think we can avoid that with either of
solution 2 or your solution.
> MR should not be getting duplicate tokens for a MR Job.
> -------------------------------------------------------
>
> 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, TokenCache.pdf
>
>
> This is the counterpart to HADOOP-7967.
> MR gets tokens for all input, output and the default filesystem when a MR job
> is submitted.
> The APIs in FileSystem make it challenging to avoid duplicate tokens when
> there are file systems that have embedded
> filesystems.
> Here is the original description that Daryn wrote:
> 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).
> The descriop
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