xuanyuanking opened a new pull request #27665: [SPARK-24355][Core][FOLLOWUP] Add flag for fetching chunks in async mode URL: https://github.com/apache/spark/pull/27665 ### What changes were proposed in this pull request? Fix the regression caused by #22173. The original PR changes the logic of handling `ChunkFetchReqeust` from async to sync, that's causes the shuffle benchmark regression. This PR fixes the regression back to the async mode by adding a feature flag. ### Why are the changes needed? Fix the shuffle performance regression described in https://github.com/apache/spark/pull/22173#issuecomment-572459561 ### Does this PR introduce any user-facing change? Add new feature flag `spark.shuffle.chunkFetchAsyncMode.enabled` ### How was this patch tested? Existing UT.
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