attilapiros 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-516867434 No. To fetch a block from the external shuffle service the network must be used. Here the executor can read the block for itself from the disk directly so the fetching via network is saved. What I meant the mechanism how it is done (reading the disk of the other executors) is the very same.
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