Github user davies commented on the pull request:
https://github.com/apache/spark/pull/2933#issuecomment-60529659
Broadcast (especially TorrentBroadcast) is designed for large object, using
it to send out small shared variables just like using tank to shot a
mosquitoes, it's not a good approach in the begging, which make simple things
complicated.
The motivation of broadcasting tasks, is to solve the performance for `BIG`
closure, it should not brings any regression for other cases (small closure),
the latter are more common and important in daily usage. In order to fix the
regression (performance or stability), we may need to introduce even more
complicated logic (just like embedded broadcast or piggy back small blocks).
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