Github user ejono commented on the issue: https://github.com/apache/zeppelin/pull/1880 @felixcheung, yes, I was referring to PySparkInterpreterTest.testCompletion, which I thought may have been broken in the new Spark 2.1 Travis CI profile because it was broken for that profile but not other profiles, and it was broken for me locally as well when using Spark 2.1. @zjffdu says that it is a flaky test though, so I have no concerns if that's the case.
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