Github user reggert commented on a diff in the pull request:

    https://github.com/apache/spark/pull/9264#discussion_r44534066
  
    --- Diff: core/src/main/scala/org/apache/spark/FutureAction.scala ---
    @@ -105,6 +108,7 @@ trait FutureAction[T] extends Future[T] {
      * A [[FutureAction]] holding the result of an action that triggers a 
single job. Examples include
      * count, collect, reduce.
      */
    +@DeveloperApi
    --- End diff --
    
    Why are we exposing these classes as "stable API"? All of the public 
methods of `AsyncRDDFunctions` return `FutureAction`, not `SimpleFutureAction` 
or `ComplexFutureAction`. The fact that the latter two classes exist at all is 
an implementation detail. 


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