Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/755#issuecomment-43131213
I see, I think that with this change, we'd promise to keep the pickle
serializer's output the same in future versions, which should be easy. We can
always add a new "pickle2" serializer if we find major problems with the
current one. So I'd suggest changing this to pickleFile and saying that.
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