Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/1698#issuecomment-50900786
Yes, I tried to implement AllReduce without having driver in the middle in
https://github.com/apache/spark/pull/506 but it introduced complex
dependencies. So I fall back to the treeReduce + torrent broadcast approach. I
hope this can be improved, maybe in v1.2.
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