[jira] [Created] (HADOOP-13123) Permit the default hadoop delegation token file format to be configurable

["Matthew Paduano (JIRA)" <ji...@apache.org>]

Matthew Paduano created HADOOP-13123:
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             Summary: Permit the default hadoop delegation token file format to be configurable
                 Key: HADOOP-13123
                 URL: https://issues.apache.org/jira/browse/HADOOP-13123
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Matthew Paduano
            Assignee: Matthew Paduano


If one environment updates to using the new dtutil code and accompanying Credentials code, there is a backward compatibility issue with the default file format being JAVA.  Older clients need to be updated to ask for a file in the legacy format (FORMAT_JAVA).  

As an aid to users in this trap, we can add a configuration property to set the default file format.  When set to FORMAT_JAVA, the new server code will serve up legacy files without being asked.  The default value for this property will remain FORMAT_PB.  But affected users can add this config option to the services using the newer code.



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