Github user anantasty commented on the pull request:
https://github.com/apache/spark/pull/941#issuecomment-44910621
Popen is the old way to do it. You could capture the stderror if you want
or just let it raise (default behavior). check_output is more pythonic since
python 2.7. 2.6 and 2.7 could both use Popen.
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