Github user rawkintrevo commented on the issue: https://github.com/apache/zeppelin/pull/928 @bzz and @jongyoul OK, so two things I think have happened. (In case some thing like this happens again). When I rebased, some version of ZeppelinClusterTest.java that had the [PySpark tests commented out](https://github.com/apache/zeppelin/pull/928/commits/d5963a9844ea9765ff2a34c5bcaf19f05a42d837#diff-64a9440e811c5fba6ac1b61157fa6912L121) got worked in, so of course it passed, the failing tests were skipped. However, I also happened to notice [here](https://github.com/apache/zeppelin/pull/928/commits/d5963a9844ea9765ff2a34c5bcaf19f05a42d837#diff-69b17249ac9d265091d730130d973f4aR493) that `org.apache.zeppelin.mahout.MahoutSparkInterpreter` was listed before `org.apache.zeppelin.spark.PySparkInterpreter` so I move the Mahout one down, and the tests seem to be passing now. This led me to believe, that is a very fragile test that should be looked into, but then I also realized I forgot to put a comma after the MahoutSparkInterpreter, so I'm going to do that now, and I'll bet what was happening, when it made the cluster: it didn't know how to make the pySpark or any of the other interpreters because of the missing comma, so mystery solved. Thanks for all of your help/sorry for wasting your time... I owe you both beers next time we're in the same spot.
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