zrlw commented on issue #13298:
URL: https://github.com/apache/dubbo/issues/13298#issuecomment-1812024229
debug跟踪了代码，consumer订阅服务调用```ServiceDiscoveryRegistry#doSubscribe```时，先调用```ServiceNameMapping#getMappingByUrl```读取AbstractReferenceConfig的providedBy属性，如果这个属性有值，就直接将其作为接口名和应用名的映射关系，看了一下代码注释，发现它的用途就是指定接口所属的应用级别服务名：
```
/**
* declares which app or service this interface belongs to
*/
protected String providedBy;
```
consumer只需要配置这个属性，比如：
```
@DubboRerference(providedBy = "helloTestApp")
private HelloAservice helloService;
```
就不再需元数据中心保存各个接口名与应用名的映射关系了。
这样nacos-sync也能在注册中心集群之间同步metadata-type=local方式的应用服务实例了。
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