Marcelo Vanzin created SPARK-25857:
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             Summary: Document delegation token code in Spark
                 Key: SPARK-25857
                 URL: https://issues.apache.org/jira/browse/SPARK-25857
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 3.0.0
            Reporter: Marcelo Vanzin


By this I mean not user documentation, but documenting the functionality 
provided in the {{org.apache.spark.deploy.security}} and related packages, so 
that other developers making changes there can refer to it.

It seems to be a source of confusion every time somebody needs touch that code, 
so it would be good to have a document explaining how it all works, including 
how it's hooked up to different resource managers.



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