Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/15137
Try to think in another way from `PythonRunner`'s point, this comment looks
correct. For yarn and mesos cluster mode, it is because we leverage distributed
cache or other to download python files to local workspace. But from
`PythonRunner`'s point, it still can only support local files.
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