Github user apiri commented on the pull request:
https://github.com/apache/nifi/pull/189#issuecomment-174546986
The Travis environment teases out a lot of these troublesome timing cases
with its high load. It is also one that is fraught with issues given the crazy
demand. Hopefully this resolves it, but in general, I mostly ensure that at
least a majority of the jobs build to say things are okay.
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