tgravescs 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-558202319 I only skimmed this but overall looks good, like this approach. When fetching the host local blocks do we have any limits on # that can happen concurrently? I didn't see anything config on just skimming it. If we have a lot of other executors on the same node we end up bypassing the remote fetch configs as to # in parallel so now we are doing more work at once here which could potentially cause more local disk activity on both the read and write sides.
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