Github user davies commented on the pull request:
https://github.com/apache/spark/pull/6557#issuecomment-107707857
SparkConf is the consistent way to manage configurations, we are moving
away from environment variables since Spark 1.0, but still keep compatibility
for old environment variables.
Sometimes, environment variables will be easy to use than SparkConf, for
example, we can switch the version of Python in a single line:
```
PYSPARK_PYTHON=pypy pypy xxx.py
```
@JoshRosen may knows more about `PYSPARK_PYTHON`
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