我也遇到同样的问题。服务正常但是日志里面会不断的出现一些报警
```
2018-11-14 20:41:42.501 [New I/O server worker #1-16] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:41:43.213 [New I/O server worker #1-17] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:41:50.846 [New I/O server worker #1-1] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:41:52.443 [New I/O server worker #1-2] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:41:52.502 [New I/O server worker #1-3] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:41:53.218 [New I/O server worker #1-4] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:42:00.849 [New I/O server worker #1-5] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:42:02.443 [New I/O server worker #1-6] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:42:02.496 [New I/O server worker #1-7] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:42:03.216 [New I/O server worker #1-8] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:42:10.854 [New I/O server worker #1-9] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:42:12.445 [New I/O server worker #1-10] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:42:12.497 [New I/O server worker #1-11] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:42:13.222 [New I/O server worker #1-12] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:42:20.860 [New I/O server worker #1-13] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:42:22.448 [New I/O server worker #1-14] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:42:22.496 [New I/O server worker #1-15] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:42:23.224 [New I/O server worker #1-16] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2
2018-11-14 20:42:30.865 [New I/O server worker #1-17] WARN  
c.a.d.r.transport.AbstractServer -  [DUBBO] All clients has discontected from 
/172.17.0.2:20880. You can graceful shutdown now., dubbo version: 2.6.3, 
current host: 172.17.0.2

```
我是用两台服务器用docker起了6个相同的提供者,但前面用负载均衡分发给每个提供者,所以docker配置里面暴露的是负载均衡的IP和负载均衡监听的端口。现在不知是什么原因导致出现这样的问题

[ Full content available at: 
https://github.com/apache/incubator-dubbo/issues/1990 ]
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