Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19642
FWIW, I asked this to Jenkins admin. Looks the problem is, the launch
script is ran by Python 2.6 from dropping the path in some Jenkins machines,
assuming from the quick look for the log. I explicitly printed this message
before - https://github.com/apache/spark/pull/19524. Quick observation is these
happen in worker 2, 6, and 7.
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