Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/4420#issuecomment-73293800
Thanks @mingyukim. On second thought I'm not so sure if we should make
these configurable, since doing so kind of pushes the responsibility to the
user to experiment with finding the optimal value for these super advanced
tuning parameters himself. I think we should explore other alternatives like
using the memory size as an additional heuristic instead of introducing highly
advanced configs that we can't remove in the future because of backward
compatibility reasons.
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