Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/5202#issuecomment-86685660
The SparkSubmit stream is on purpose because pyspark expects the very first
line of stdout to be the port number to connect to the py4j gateway. So you
can't print anything to stdout before that line. (That may or may not affect
this change, but it's something to look at.)
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