Github user suyanNone commented on the pull request:
https://github.com/apache/spark/pull/4887#issuecomment-136657671
@srowen @nitin2goyal I not sure it is need because there is a big change
for memory threshold per thread.
In the previous situation, it is aim to resolve memory_and_disk level
block, first unroll failed, but it will reserved unroll memory for this thread,
and that unroll memory part should release after that block already put into
disk.
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