Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/9179#issuecomment-149706049
@davies can comment, I believe in PySpark the PYSPARK_DRIVER_PYTHON or
PYSPARK_PYTHON is passed from the driver to the executer
https://github.com/apache/spark/blob/master/python/pyspark/context.py#L181
https://github.com/apache/spark/blob/master/python/pyspark/rdd.py#L2384
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala#L68
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