Github user ryan-williams commented on the pull request: https://github.com/apache/spark/pull/2848#issuecomment-67253690 Thanks a lot for the build-process brain-dump, @JoshRosen; some of that is way better than processes I've wasted a lot of time on. I'm interested in getting all of these tips and tricks pushed to Spark docs, but even after all of the emailing your response includes tricks I've not seen documented anywhere (e.g. `SPARK_PREPEND_CLASSES`), so I'm leery of spending time trying to document what I've learned for fear that I'm still not at the bottom of the rabbit hole. In any case, I was able to debug and (I believe) fix the test failure, which was a result of having inadvertently changed a file "copy" to a "move", so it's a good thing the test caught it. This should be ready to re-test.
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