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-553580712 With my previous commit accessing host local directories became asynchronous. And it is uses the external shuffle service where directories are cached for all host local executors (as `org.apache.spark.network.shuffle.ExternalShuffleBlockResolver#executorRemoved` does not remove any entry from `executors`) so this way fallback to remote fetch is not needed.
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