当Storm Topology在分发群集中启动时，我发现netty连接将失败，消息将被客户端自行删除。
工作人员日志信息如下：
2016-08-02T11:00:11.408+0800 b.s.m.n.Client [ERROR] connection to Netty-Client-h040.kt/192.168.18.40:6702 is unavailable
2016-08-02T11:00:11.408+0800 b.s.m.n.Client [ERROR] dropping 1 message(s) destined for Netty-Client-h040.kt/192.168.18.40:6702
2016-08-02T11:00:11.408+0800 b.s.m.n.Client [ERROR] connection to Netty-Client-h040.kt/192.168.18.40:6702 is unavailable
2016-08-02T11:00:11.408+0800 b.s.m.n.Client [ERROR] dropping 1 message(s) destined for Netty-Client-h040.kt/192.168.18.40:6702
2016-08-02T11:00:11.408+0800 b.s.m.n.Client [ERROR] connection to Netty-Client-h040.kt/192.168.18.40:6702 is unavailable
2016-08-02T11:00:11.408+0800 b.s.m.n.Client [ERROR] dropping 1 message(s) destined for Netty-Client-h040.kt/192.168.18.40:6702
2016-08-02T11:00:11.408+0800 b.s.m.n.Client [ERROR] connection to Netty-Client-h040.kt/192.168.18.40:6702 is unavailable
2016-08-02T11:00:11.408+0800 b.s.m.n.Client [ERROR] dropping 1 message(s) destined for Netty-Client-h040.kt/192.168.18.40:6702
2016-08-02T11:00:11.408+0800 b.s.m.n.Client [ERROR] connection to Netty-Client-h040.kt/192.168.18.40:6702 is unavailable
2016-08-02T11:00:11.408+0800 b.s.m.n.Client [ERROR] dropping 2 message(s) destined for Netty-Client-h040.kt/192.168.18.40:6702
2016-08-02T11:00:11.409+0800 b.s.m.n.Client [ERROR] connection to Netty-Client-h040.kt/192.168.18.40:6702 is unavailable
2016-08-02T11:00:11.409+0800 b.s.m.n.Client [ERROR] dropping 1 message(s) destined for Netty-Client-h040.kt/192.168.18.40:6702
2016-08-02T11:00:11.410+0800 b.s.m.n.Client [ERROR] connection to Netty-Client-h040.kt/192.168.18.40:6702 is unavailable
2016-08-02T11:00:11.410+0800 b.s.m.n.Client [ERROR] dropping 1 message(s) destined for Netty-Client-h040.kt/192.168.18.40:6702
2016-08-02T11:00:11.411+0800 b.s.m.n.Client [ERROR] connection to Netty-Client-h040.kt/192.168.18.40:6702 is unavailable
2016-08-02T11:00:11.411+0800 b.s.m.n.Client [ERROR] dropping 1 message(s) destined for Netty-Client-h040.kt/192.168.18.40:6702
2016-08-02T11:00:11.411+0800 b.s.m.n.Client [ERROR] connection to Netty-Client-h040.kt/192.168.18.40:6702 is unavailable
2016-08-02T11:00:11.411+0800 b.s.m.n.Client [ERROR] dropping 1 message(s) destined for Netty-Client-h040.kt/192.168.18.40:6702
2016-08-02T11:00:11.658+0800 b.s.m.n.Client [ERROR] connection attempt 201 to Netty-Client-h040.kt/192.168.18.40:6702 failed: java.lang.RuntimeException: Returned channel was actually not established
2016-08-02T11:00:12.401+0800 b.s.m.n.Client [ERROR] connection attempt 202 to Netty-Client-h040.kt/192.168.18.40:6702 failed: java.lang.RuntimeException: Returned channel was actually not established