@dslchd According to #1155, the netty blocks shutdown tomcat. 
the conflict is : 
> dubbo v2.6.3 depends on netty v3.2.5, 
> curator-framework v2.12.0 depends on netty v3.7.0.

tomcat shutdown normally after exclude netty from curator-framework.
Maybe dubbo should explicitly close zookeeper client in the future.

[ Full content available at: 
https://github.com/apache/incubator-dubbo/issues/2326 ]
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