Github user davies commented on the pull request:
https://github.com/apache/spark/pull/2030#issuecomment-52677770
@rxin I think we can only benefit from broadcast an rdd when the closure is
big enough, such as more than 1M bytes. But his most cases, the closure shoud
be less than 10k. How about we turn on broadcasting only when the size of
closure is big enough? This may make the code a little bit complicated, but may
be make it faster in most cases (small closure).
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