Github user doanduyhai commented on the issue:
https://github.com/apache/zeppelin/pull/1262
@jongyoul
`caused by: com.datastax.driver.core.exceptions.NoHostAvailableException:
All host(s) tried for query failed (tried: localhost/127.0.0.1:9107
(com.datastax.driver.core.exceptions.OperationTimedOutException:
[localhost/127.0.0.1] Timed out waiting for server response))
`
The CI server is overloaded so the embedded Cassandra did not start in
timely manner. Usually re-launching the test make it work
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