Github user windpiger commented on the issue: https://github.com/apache/spark/pull/16173 if the trait BroadcastFactory is designed for user not for internal, it is better to add this conf eventhough there is no a more scalable broadcast. Or we can modify the comment https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/broadcast/BroadcastFactory.scala#L25-L30
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