Github user rxin commented on the issue:
https://github.com/apache/spark/pull/18343
It's obvious it will reduce data size with custom serialization, since the
custom logic doesn't need to write the full classname out which the java
default one does.
I don't think Kryo knows what to do with serializable either, unless we
specifically register it -- so we'd need to implement both either way whenever
we implement custom serialization logic.
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