Github user squito commented on the issue:
https://github.com/apache/spark/pull/20596
Have you seen a case where you actually have an off-heap buffer passed in,
though the desire storage is on-heap? Eg. if its comes from the block transfer
service than I think it will always be on-heap:
https://github.com/apache/spark/blob/2ee76c22b6e48e643694c9475e5f0d37124215e7/core/src/main/scala/org/apache/spark/network/BlockTransferService.scala#L108
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