Github user kishorvpatil commented on the issue: https://github.com/apache/spark/pull/15009 @vanzin, - I refactored unit tests - Changed LAUNCHER_INTERNAL* variable access to package private - Fixed some of the nits. About passing sys.env, we want to capture set of sys.env variables while launching the new SparkApp. In thread mode, the launching user code could change the sys.env variables after launching application. For instance even pollute env while launching another Spark app. We made a lot of code changes to ensure this.
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