Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/1338#issuecomment-50187471
One difference between this case and `saveAsPickleFile` is that here the
actual on-disk output is independent of the batch size, since the data gets
unbatched in Java, while `saveAsPickleFile` actually writes the batched data
directly to a file.
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