Github user jongyoul commented on the issue:
https://github.com/apache/zeppelin/pull/1283
There're some `Thread.sleep(1000)` in your tests. In general, it would be
nice and never be a blocker. It, however, occurs build error if CI become
extremely slow. It also become a flaky test. Do you have any idea to make it
more stable? And I have a question. Which part prevents updating output twice?
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