wangjiaochun commented on issue #24127: [SPARK-27186][CORE] optimize sortshuffle write URL: https://github.com/apache/spark/pull/24127#issuecomment-475091856 The underlying Iterator do nothing. so I think it's worth revising. first, ExternalSorter-instantiated is expensive operation, such as there is need to estimate the size of all the collection of the Instances. Also create tmp file is needless.
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