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 .
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
