srowen commented on issue #24349: [Spark-27416][SQL]UnsafeMapData & UnsafeArrayData Kryo serialization breaks when two machines have different Oops size URL: https://github.com/apache/spark/pull/24349#issuecomment-482179098 It would be for performance, for the same reason all the basic spark classes are registered; otherwise Kryo serializes the class name with each instance. Why wouldn't it matter? maybe I'm missing something
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