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https://issues.apache.org/jira/browse/MAPREDUCE-3849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13209562#comment-13209562
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Mahadev konar commented on MAPREDUCE-3849:
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Daryn,
Did you test this with something like Oozie where the delegation tokens are
loaded from a file in the mapper? If not we should test that out.
> Change TokenCache's reading of the binary token file
> ----------------------------------------------------
>
> Key: MAPREDUCE-3849
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3849
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: security
> Affects Versions: 0.23.1, 0.24.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Fix For: 0.23.2
>
> Attachments: MAPREDUCE-3849-2.patch, MAPREDUCE-3849.patch
>
>
> When obtaining the tokens for a {{FileSystem}}, the {{TokenCache}} will read
> the binary token file if a token is not already in the {{Credentials}}.
> However, it will overwrite any existing tokens in the {{Credentials}} with
> the contents of the binary token file if a single token is missing. This may
> cause new tokens to be replaced with invalid/cancelled tokens from the binary
> file. The new tokens will not be canceled, and thus "leak" in the namenode
> until they expire.
> The binary tokens should be merged with, but not replace, existing tokens in
> the {{Credentials}}.
> The code that reads the binary token file is prefaced with:
> {code}
> //TODO: Need to come up with a better place to put
> //this block of code to do with reading the file
> {code}
> Also, the loading of the binary token file is the only reason that the
> {{TokenCache}} has to use {{getCanonicalService}}. If this linkage can be
> broken, then the 1-to-1 filesystem to token service coupling may be removed.
> And use of {{getCanonicalService}} can be removed in a subsequent jira.
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