Github user qwemicheal commented on the issue:
https://github.com/apache/zeppelin/pull/2390
@zjffdu The failure most often happen on the third one of Travis CI ,
sometimes the second one or ninth one. I have checked the error log multiple
times and they all have nothing to do with the Livy code I modified. Most of
the time just rerun the failed test can then pass. However, the pass statue
won't get updated on PR page so I have to trigger the CI again. Do you have any
better way to deal with random failure on CI?
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