xuanyuanking commented on issue #26095: [SPARK-29435][Core]Shuffle is not working when spark.shuffle.useOldFetchProtocol=true URL: https://github.com/apache/spark/pull/26095#issuecomment-541582604 Please also change the PR description, the detailed log and code can be skipped, even the code linked with master will always in changing. We need to mention the consistency between shuffle reader/writer while using old protocol, and the limitation of using `mapTaskId` in OpenBlock message.
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