Github user zdove commented on the issue:
https://github.com/apache/spark/pull/14239
Thank you for your reply.
I consider that the code you have changed don't involve about SparkConf. If
you don't change the default SparkConf file then Spark will not recognize the
parameter spark.shuffle.prepare.open, am I rightï¼
And even after Spark recognize the spark.shuffle.prepare.open you set,
where and when will it send this message to
shuffle/src/main/java/org/apache/spark/network/shuffle/protocol/BlockTransferMessage.java
PREPARE_BLOCKS(6) ?
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