Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/9344#issuecomment-152800152
One bad complication: until we can _completely_ support off-heap memory for
execution, we need to perform separate accounting for on-heap and off-heap
memory, so `spill()` will need to report accurate information on the amount of
on-heap and off-heap memory that's freed.
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