Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/1174#issuecomment-142700908
Let me check the implications tomorrow: I've put a comment there which
explicitly says that putting netty there is dangerous ;)
```xml
<!-- this section defines the module versions that are used if nothing
else is specified. -->
<dependencyManagement>
<!-- WARN:
DO NOT put guava,
protobuf,
asm,
netty
here. It will overwrite Hadoop's guava
dependency (even though we handle it
separatly in the flink-shaded-hadoop module).
We can use all guava versions everywhere by adding it
directly as a dependency to each project.
-->
<dependencies>
```
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