Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/2337#issuecomment-55048286
The point of adding the "jobId" method to SimpleFutureAction was so that
code calling these async methods knew the IDs of the jobs they were triggering
(see SPARK-2636). Except the job ID is not really exposed at all since
SimpleFutureAction is not exposed through the async APIs.
(Sure you could cast the result, but that's ugly, and that also does not
cover ComplexFutureAction.)
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