Github user JoshRosen commented on the pull request:

    https://github.com/apache/spark/pull/4324#issuecomment-72601740
  
    LGTM; this is a pretty straightforward change.  Compared to implementing 
this in Java, this gains the benefit of having this class's docs appear in 
Scaladoc.  I guess there's a potential downside of Java compatibility / 
usability being broken should we add new methods, but I think we can address 
that via our review processes.  It might be nice to add a comment at the top of 
the `TaskContext` and `TaskContextImpl` files referencing the 
`JavaTaskCompletionListenerImpl` test case so that people remember to update it 
when adding new methods.


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