Github user steveloughran commented on the pull request:

    https://github.com/apache/spark/pull/10545#issuecomment-168496890
  
    I should add that i'm thinking of moving the core `rest` package from 
`yarn/src/history` to `yarn/src/main`. Why? It adds Hadoop authentication to 
Jersey Client, so allows general REST access to any of the Hadoop services. The 
ATS client simply uses this to talk to ATS —it can just as easily be used to 
talk to anything (including spark apps) through the YARN RM proxy even when 
kerberos/SPNEGO auth is enabled in YARN. This makes it more generic and useful 
elsewhere.


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