Github user skonto commented on the issue: https://github.com/apache/spark/pull/22004 @srowen I was able to reproduce and investigate this further but cleaning in 2.11 does not seem to affect serialization in this case. I moved the serialization check at the beginning of the clean method in the ClosureCleaner and run with 2.11 and it passes. Waiting for feedback from @lrytz on the bytecode stuff.
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