Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/506#issuecomment-46380865
Thanks all for reviewing this PR! I found the butterfly pattern introduces
complex dependency that slows down the computation. In my tests, a good
approach for Spark is tree reduce + bt broadcast. So I'm closing this one now
in favor of https://github.com/apache/spark/pull/1110 .
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