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https://issues.apache.org/jira/browse/SPARK-25857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16704894#comment-16704894
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Gabor Somogyi commented on SPARK-25857:
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+1, it's not easy topic.

> 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
>            Priority: Minor
>
> 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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