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From "Robert Joseph Evans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3849) Change TokenCache's reading of the binary token file
Date Thu, 16 Feb 2012 17:49:02 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13209536#comment-13209536
] 

Robert Joseph Evans commented on MAPREDUCE-3849:
------------------------------------------------

Thanks Daryn the patch looks good +1
                
> 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-3849-2.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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