cloud-fan 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-530222762 Should this be a general optimization? When a reduce task needs to read some shuffle blocks that are happened to exist locally, we can read the shuffle files directly instead of going through the shuffle service.
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