Github user jacek-lewandowski commented on the pull request:
https://github.com/apache/spark/pull/4220#issuecomment-71988851
I found that there is a small difference in the outcome of my code in
comparison to the original code. I don't know how it affect this test suite
yet, but: the default Java wrapper over the system properties, which was used
originally uses `entrySet` method to get the properties. It means that when
there are some defaults defined, there are not used. On the other hand,
`stringPropertyNames` method returns a set of property keys - both defined
explicitly and by providing default values. The same for `System.getProperty`
method. The later behaviour seems more appropriate here.
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