Move Delegation token into Common so that we can use it for MapReduce also
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Key: HDFS-949
URL: https://issues.apache.org/jira/browse/HDFS-949
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Owen O'Malley
Assignee: Owen O'Malley
We need to support a MapReduce job that launches another MapReduce job inside
its Mapper. Since the task doesn't have any Kerberos tickets, we need a
delegation token. Moving the HDFS Delegation token to Common will allow both
projects to use it.
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