srowen commented on pull request #34474:
URL: https://github.com/apache/spark/pull/34474#issuecomment-959610670


   Looking at the implementation, it's never meant to be serialized by Java or 
Kryo, but is serialized 'manually' and internally by Spark. I think it must be 
related to observe() here, that somehow this object gets caught up in what is 
returned? I don't know a lot about observe().
   
   It's possible the answer is that observe() should do something different, 
but not sure.
   
   We can make this Serializable, but then need to implement methods for the 
Java serializer that would reuse the existing serializer code. That seems 
plausible.


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