[jira] [Created] (MAPREDUCE-3849) Change TokenCache's reading of the binary token file

["Daryn Sharp (Created) (JIRA)" <ji...@apache.org>]

Change TokenCache's reading of the binary token file
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                 Key: MAPREDUCE-3849
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3849
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: security
    Affects Versions: 0.23.1, 0.24.0
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp


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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