Github user srowen commented on the issue: https://github.com/apache/spark/pull/18343 I don't quibble with custom serialization logic, but you can do that with `Serializable` too. And Kryo has its own marker interface too. I wonder what the purpose of `Externalizable` is then. Actually, I've always wondered this in general about this JDK interface (which extends `Serializable`) so maybe i'm missing something.
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