Github user yaooqinn commented on the issue:
https://github.com/apache/spark/pull/19840
<img width="1246" alt="wx20171201-145631 2x"
src="https://user-images.githubusercontent.com/8326978/33471349-e570953e-d6a7-11e7-9fec-74963efe37d2.png";>
@jerryshao ENVs are specified ok by yarn, but the `pythonExec` is generated
in `PythonRDD` at driver side and delivered to executor side within a closure
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