Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/6227#issuecomment-103710063
On closer inspection, I'm thinking that we should probably prefer
WeakReferences to SoftReferences, since it's probably better to allow this
memory to be released sooner in response to memory demand rather than having
the heap grow in order to try to keep empty pages in the pool.
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