matthewrj commented on pull request #32973:
URL: https://github.com/apache/spark/pull/32973#issuecomment-864606858


   No, I haven't done any performance tests. Like I said in the PR description, 
my motivation was to be able to turn on `spark.kryo.registrationRequired` and 
find any classes I hadn't registered. Since it would stop the job as soon as it 
got to `ShippableVertexPartition`, I need this to be registered so I can see if 
there are other classes my job tries to serialize after 
`ShippableVertexPartition`.


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