Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/2868#issuecomment-61173555
I agree it probably only used 2 executors since there were only 2
partitions for the data. (I think reduceByKey uses the same partitioner by
default.)
I think it'd be good to include now, to be used more in the future with
other optimizations & for dumping trees to disk, as you point out.
Thanks for running more tests! Please let me know when it's ready for a
final pass.
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