Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/4228#issuecomment-71710396
@mengxr if we are going to add this as a first class API, can we have it in
Java and Python too? Also, /cc to @rxin to also vet whether we want this in the
core API. My feeling is that it's hard for users to figure out how to do this
on their own, and for any expensive reduction function, users will need
something like this in a large cluster.
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