Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/21977
@gatorsmile, I started
[YarnPySparkSuite](https://gist.github.com/rdblue/9848a00f49eaad6126fbbcfa1b039e19)
but the YARN tests don't create python worker processes so the tests don't
work. I need to find out how to force YARN to create workers in order to write
tests. If you have any input that would help, please let me know.
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