Github user felixcheung commented on the issue:
https://github.com/apache/zeppelin/pull/1742
So there were 2 runs
The older run https://travis-ci.org/apache/zeppelin/jobs/182613697 failed
with Spark cluster tests
The newer run https://travis-ci.org/apache/zeppelin/builds/183250971 failed
with cassandra tests
Given that and no code changes between, I think we could attribute the
failures to flaky test.
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