Github user kevincox commented on the pull request:
https://github.com/apache/spark/pull/6714#issuecomment-110364692
Also why keep the batch size once you know you are going to spill to disk.
All that does is force you to draw from the iterator in batches. Once you know
how big your chunk size should be you can set `batch` to `len(current_chunk)`
(possibly `*0.8` or something) so that you can do it in a single call since you
already know you will be spilling to disk.
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