Github user brkyvz commented on the pull request:
https://github.com/apache/spark/pull/4286#issuecomment-136522922
The merge conflicts should be minor. Due to `Since(1.3.0)`s. @mengxr Would
we like this for 1.6? I'm thinking of implementing some optimizations to the
code as well in a separate PR. Namely:
1- perform fake join on the driver on metadata to figure out which
partitions we need to send blocks to
2- communicate a block once to a partition, and join inside the partition
as many times as needed
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