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-558214745 @tgravescs The block content reading will occur at the client side of the 'ShuffleBlockFetchIterator' as the blocks are wrapped into 'FileSegmentManagedBuffer'. Over and above on one specific executor the host local blocks with cached executor directories are handled synchronously in one single thread (just like local blocks) and host local blocks for which directories are not cached are handled on a separate but single thread (on the thread which used to get all the missing directories via one RPC call).
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