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Robert Joseph Evans commented on MAPREDUCE-3849:
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Also have you run any tests on clusters with this change? Have you tried to run jobs with
security enabled?
> 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
> Attachments: 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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