[GitHub] [dubbo] haiyang1985 opened issue #5531: Lazy connection is not shared sometimes.

["haiyang1985 (GitHub)" <gi...@apache.org>]

- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [ ] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 2.7.3
* Operating System version: macOs sierra
* Java version: 1.8

### Steps to reproduce this issue

1. start provider with two service defined.
```
<bean id="demo1" class="com.ctrip.framework.cdubbo.DemoServiceImpl"/>
<dubbo:service interface="com.ctrip.framework.cdubbo.DemoService" ref="demo1">
</dubbo:service>

<bean id="demo2" class="com.ctrip.framework.cdubbo.DemoService2Impl"/>
<dubbo:service interface="com.ctrip.framework.cdubbo.DemoService2" ref="demo2">
</dubbo:service>
```

2. refer the two different service in lazy connection.
```
<dubbo:reference id="demoService1" interface="com.ctrip.framework.cdubbo.DemoService" lazy="true">
</dubbo:reference>

<dubbo:reference id="demoService2" interface="com.ctrip.framework.cdubbo.DemoService2" lazy="true">
</dubbo:reference>

```

3.when client started, the netstat -ano shows the connection status as following.
```
TCP    0.0.0.0:20880          0.0.0.0:0              LISTENING       388
TCP    [::]:20880             [::]:0                 LISTENING       388
```

4. send a call to DemoService, the connection from  10.xx.xx.151:50776-> 10.xx.xx.151:20880 is established.
```
TCP    0.0.0.0:20880          0.0.0.0:0              LISTENING       388
TCP    10.xx.xx.151:20880     10.xx.xx.151:50776     ESTABLISHED     388
TCP    10.xx.xx.151:50776     10.xx.xx.151:20880     ESTABLISHED     22444
TCP    [::]:20880             [::]:0                 LISTENING       388
```

5. send another call to DemoService2, a new connection is established (10.xx.xx.151:50778-> 10.xx.xx.151:20880)
```
TCP    0.0.0.0:20880          0.0.0.0:0              LISTENING       388
TCP    10.xx.xx.151:20880     10.xx.xx.151:50776     ESTABLISHED     388
TCP    10.xx.xx.151:20880     10.xx.xx.151:50778     ESTABLISHED     388
TCP    10.xx.xx.151:50776     10.xx.xx.151:20880     ESTABLISHED     22444
TCP    10.xx.xx.151:50778     10.xx.xx.151:20880     ESTABLISHED     22444
TCP    [::]:20880             [::]:0                 LISTENING       388
```

For request-response mode, create new connection is not a big deal.
But, for stream callback, response cannot come back once url changed(Dubbo will destroy the old invoker and connection, due to lazy cannot share connection in some circumstance). 



[ Full content available at: https://github.com/apache/dubbo/issues/5531 ]
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