yaooqinn commented on pull request #33063:
URL: https://github.com/apache/spark/pull/33063#issuecomment-868943286


   @mridulm @dongjoon-hyun, I re-run the benchmark based on the final commit 
manually. The debug log below shows the performance regression is gone.
   ```log
   21/06/26 04:04:01 INFO MapOutputTrackerWorker: Got the map output locations
   21/06/26 04:04:01 DEBUG ShuffleBlockFetcherIterator: maxBytesInFlight: 
50331648, targetRemoteRequestSize: 10066329, maxBlocksInFlightPerAddress: 
2147483647
   21/06/26 04:04:01 DEBUG ShuffleBlockFetcherIterator: Creating fetch request 
of 2606046 at BlockManagerId(2, 10.1.5.72, 37767, None) with 88 blocks
   21/06/26 04:04:01 DEBUG ShuffleBlockFetcherIterator: Collected remote fetch 
requests for BlockManagerId(2, 10.1.5.72, 37767, None) in 82 ms
   ```
   


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