@leventov I don't have a great way to tell right now (we don't use http emitter internally) but looking at https://github.com/apache/incubator-druid/pull/4973#issuecomment-342966715 I was able to pinpoint the offending library causing all kinds of netty versions to be brought in. It was upgraded to a version that uses netty 4.1.29-Final
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