Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/592#issuecomment-41843764
@kanzhang I'm no expert either unfortunately :P. I do think in general we
ask (maybe require) authors to sign over copyright to Apache when they
contribute.
I think this code might be a somewhat abnormal case, I noticed @joshrosen
actually added this code (from UCB) in the original pyspark commit. I suspect
the reason is that he was borrowing source code from an existing library and
pulled in the corresponding license. In the case where pull in source code from
other libraries I believe this is the correct thing to do.
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