vanzin commented on issue #25299: [SPARK-27651][Core] Avoid the network when shuffle blocks are fetched from the same host URL: https://github.com/apache/spark/pull/25299#issuecomment-529703736 > I would do the mentioned improvements in a separate PR If you want to do that I'd have this feature disabled by default until those are implemented. I'm not sure the current approach is a win, since executors may block at the start of a shuffle waiting for a reply from the driver.
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