Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/455#issuecomment-50451633
@rjurney This means you have two conflicting versions of Netty in the
build. It may or may not be to do with the JIRA you cite, just because there
are lots of Netties floating around and lots of ways they can collide. Maybe
you can restate what version you are buildling, how you are building at this
point and any modifications to the build? `mvn dependency:tree` will reveal
where Netties are coming from.
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