Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/1977#issuecomment-55978058
Also, can you see what happens when you do rdd.groupByKey().cache()? Can we
serialize and deserialize these objects back to Scala-land? It's okay if we
can't cache overly large groups for now, but we should just make sure this
works.
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