JkSelf commented on issue #25295: [SPARK-28560][SQL] Optimize shuffle reader to local shuffle reader when smj converted to bhj in adaptive execution URL: https://github.com/apache/spark/pull/25295#issuecomment-530319218 @cloud-fan Thanks for you reviews! When the shuffle blocks exist locally, the shuffle service already read the blocks locally even through shuffle service in [ShuffleBlockFetcherIterator](https://github.com/apache/spark/blob/7f36cd2aa5e066a807d498b8c51645b136f08a75/core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala#L100), I think. Correct me if wrong understanding! If so, whether need to optimize it to locally read?
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