Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/12217#issuecomment-207410404
@jkbradley I see what you mean, but, thinking about it, can this work? the
reduce function is applied directly to RDD elements, so modifying one of the
arguments and returning it means you're mutating the elements of the RDD in
memory, which may have some undefined consequences. For fold, it's fine because
the left argument is always actually the zero-value object. Right? Or am I not
thinking about it correctly. It might happen to be fine to use reduce in some
cases where the RDD values are not used again.
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