Github user marmbrus commented on the pull request:

    https://github.com/apache/spark/pull/448#issuecomment-42224442
  
    @kanzhang, Good point about the public APIs.  I talked with @pwendell and 
we are a little concerned that this.type will make binary computability hard 
long term, mostly because we don't understand the bytecode being produced.  
Could you possibly run `javap` on some of the RDD classes and let us know what 
the function signatures look like for the changed methods?


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