squito commented on issue #23438: [SPARK-26525][SHUFFLE]Fast release ShuffleBlockFetcherIterator on completion of the iteration URL: https://github.com/apache/spark/pull/23438#issuecomment-458384306 I just had another idea -- maybe instead you create a separate class for the TaskCompletionListener (instead of having it be an anonymous inner class in ShuffleBlockFetcherIterator), and when the end of the iterator is reached, you could null out the reference to the ShuffleBlockFetcherIterator. The TaskCompletionListener woudl still get called later at the end of the task, but it wouldn't be holding onto the ShuffleBlockFetcherIterator, and its action would be a no-op.
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