Github user erikerlandson commented on the pull request:
https://github.com/apache/spark/pull/1351#issuecomment-53308965
Hi @marmbrus, I submitted PromiseRDD as part of PR #1839, which is awaiting
review.
There is another somewhat different approach I used for sortByKey on PR
#1689. My intuition is that using something like PromiseRDD is preferable when
possible, because it respects the RDD computation model. (I do not think it is
possible for sortByKey, because in that case the sampling job is required for
initializing the partitions themselves)
These are under an umbrella ticket:
https://issues.apache.org/jira/browse/SPARK-2992
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