Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1078
I think the reason SparkRTest() failing was because of resource.
pySpark() test creates 33 python processes (num core + 1) and that seems
make unable to run SparkRTest().
I have changed `spark.core.max` property to 2 for CI test, so now only 3
python processes are created. Triggered CI couple of times with these changes.
I still see some CI failure by network fault or the other flaky tests, but can
not see SparkRTest() failure anymore.
I'm merging it into master and branch-0.6 as a hotfix.
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