Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3739#issuecomment-67605537
> Ideally, a test should not modify environment shared by other tests. Or
we cannot make the tests run in parallel.
We can achieve parallelism by running multiple tests in separate JVMs.
This PR doesn't introduce any new forms of sharing between tests; it only
attempts to fix bugs in cases where we have such sharing but don't clean up
properly (e.g. by setting some system properties then forgetting to clear them
or to change them back to the old values).
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