Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/15670#discussion_r143838765
--- Diff: python/pyspark/serializers.py ---
@@ -64,7 +64,7 @@
from itertools import izip as zip
else:
import pickle
- protocol = 3
+ protocol = min(pickle.HIGHEST_PROTOCOL, 4)
--- End diff --
It sounds like this part of the change would be ok then since Pyrolite can
read v4 just fine.
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