aowubulao opened a new issue #9622:
URL: https://github.com/apache/dubbo/issues/9622
* Dubbo version: 2.7.15(2.7.7测试也存在)
* nacos version: 2.0.2
* Operating System version: macos12、centos7
* Java version: 1.8
**复现**
nacos：重启nacos或者使用新的一个ip启动provider应用
dubbo：
首先新建一个自定义Dispatcher
```java
public class TestDispatcher implements Dispatcher {
public static final String NAME = "test";
@Override
public ChannelHandler dispatch(ChannelHandler handler, URL url) {
return new MessageOnlyChannelHandler(handler, url);
}
}
```
同时在META-INFO.dubbo中也创建对应文件
在配置中指定：
```properties
dubbo.protocol.dispatcher=test
```
启动服务后，nacos注册成功，可以看到dispatcher等信息都是成功注册的，同时consumer在nacos上也可以看到
```json
{
"side": "provider",
"service.name": "ServiceBean:/xxx.xxx.demo.serivce.SayService",
"methods": "sayHelloByName",
"release": "2.7.15",
"deprecated": "false",
"dubbo": "2.0.2",
"threads": "5",
"pid": "77518",
"interface": "xxx.xxx.demo.serivce.SayService",
"threadpool": "fixed",
"generic": "false",
"corethreads": "5",
"path": "xxx.xxx.demo.serivce.SayService",
"protocol": "dubbo",
"metadata-type": "remote",
"application": "provider-service",
"dynamic": "true",
"category": "providers",
"dispatcher": "test",
"anyhost": "true",
"threadname": "default-thread",
"timestamp": "1643015362814"
}
```
但是调用服务会失败：
```
Failed to invoke the method sayHelloByName in the service
xxx.xxx.demo.serivce.SayService. No provider available for the service
xxx.xxx.demo.serivce.SayService from registry 127.0.0.1:8848 on the consumer
10.179.116.54 using the dubbo version 2.7.15. Please check if the providers
have been started and registered.
```
**如何调用成功**
在配置中修改dispatcher为message，启动服务注册成功后，再将dispatcher改为test，重启服务，consumer便可以成功调用
```properties
dubbo.protocol.dispatcher=message
```
但是线上k8s等服务ip可能会改变，不可能使用改dispatcher重启等方法让consumer调用
**暂时的解决办法**
将自定义的dispatcher的name定义为dubbo已有的，比如message，覆写该dispatcher，便可以直接调用成功
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