Github user jacek-lewandowski commented on the pull request:
https://github.com/apache/spark/pull/4220#issuecomment-71992373
It looks like there is `ResetSystemProperties` trait which works completely
wrong. Its aim is to save system properties before the test and the reset them
after the test. However, the way the copy was created and then restored was
invalid.
The copy was created in this way:
```scala
oldProperties = new Properties(System.getProperties)
```
which did not initialize properties as they were in the original system
properties but rather set them as defaults in new properties object, which in
turn made `JPropertiesWrapper` not consider them at all (actually
JPropertiesWrapper would return empty iterator then).
The way I'm gonna fix `ResetSystemProperties` class is to use
`SerializationUtils.clone` to save the system properties.
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