Github user JoshRosen commented on the pull request: https://github.com/apache/spark/pull/3805#issuecomment-68156238 This class of issue could be a more general problem for our test-suites, since I think there are a number of places where we call things like `new SparkConf()` that might implicitly read defaults from the configuration file. I wonder if there's a more general fix, such as using `Utils.isTesting` to bypass the defaults loading in unit tests.
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