[GitHub] [spark] attilapiros edited a comment on issue #25299: [SPARK-27651][Core] Avoid the network when shuffle blocks are fetched from the same host

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attilapiros edited a comment 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 (and writing the content to a file) is really avoided. What I meant the mechanism how it is done (reading the disk of the other executors) is the very same.

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