HyukjinKwon commented on issue #24519: [SPARK-27612][PYTHON] Use Python's default protocol instead of highest protocol URL: https://github.com/apache/spark/pull/24519#issuecomment-488907804 cc @BryanCutler and @viirya This PR could not identify the root cause yet (but only my rough hypothesis). I would like to get this in first and then do the investigation separately. One concern about using default protocol is that it's not tested in cloudpickle. I opened a PR to add a env to control that and test it (https://github.com/cloudpipe/cloudpickle/pull/265).
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