Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/1562#issuecomment-50266091
@rxin @mateiz I have one question about using `rdd.id` as random seed shift
to avoid sampling the same sequence in each partition. It is a constant within
a session. But it becomes harder for a user to reproduce the result again. Is
it a big deal?
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