Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18695
Last question to check if I read correctly. So, the problem is around
`_prepare_for_python_RDD` in `rdd.py` basically because it adds the pickled
ones into the registry when it's pickled but this should be thread-safe?
Let's fix up the description to describe a thread local. LGTM too
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