Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/11791#issuecomment-198584688
/cc @rxin @andrewor14, this is the next most important patch to review
towards off-heap caching. After these changes get in, we'll be able to use
off-heap memory for the unroll memory in off-heap caching, greatly simplifying
things. Without this change, the on-heap unroll array needs to be accounted
properly even if the final cache destination is off-heap, making the caching
more OOM-prone and complicating the accounting logic (since it then becomes
different between the two modes).
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