cloud-fan commented on issue #23438: [SPARK-26525][SHUFFLE]Fast release ShuffleBlockFetcherIterator on completion of the iteration URL: https://github.com/apache/spark/pull/23438#issuecomment-458393253 > IMO, its not unreasonable to add this api. Yea I agree with it, but up to my experience, this kind of problem has a simpler fix: just null out/clear the real data, instead of avoiding the reference of the outer object. I haven't looked into the code it, but `ShuffleBlockFetcherIterator` has many maps/sets, maybe we just need to clear them in `cleanup`.
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