srowen commented on pull request #29231:
URL: https://github.com/apache/spark/pull/29231#issuecomment-663860594


   If the fix works, great. I think this might help me understand another 
failure in the streaming component.
   I'm trying to understand why it fails now. Externalizable should still start 
by constructing this object with the no-arg constructor, which does init this 
field. I think the key is that Externalizable wants a public no-arg constructor 
and this isn't public, and for some reason that is now a problem.
   
   Other possible fixes? make it public (the class is private anyway). 


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