Github user JPercivall commented on the issue: https://github.com/apache/nifi/pull/483 Thank you for the complements. The "InterruptedException" essentially means something want this thread to stop for some reason (here's an overview of [this](http://www.yegor256.com/2015/10/20/interrupted-exception.html)). At that point, we just want to proceed without lingering or stopping as best we can. Also since we are synchronized on the message, when we resume we can be sure that we are the only ones working on the message at that time. So we just need to be sure the other thread does it's best to take into account what the state of the message is. Also for future reference, you shouldn't rebase other people's commits into yours. In order to keep track of who did what (and who to blame when things break, lol) you should just use "git am <patch>".
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