> As the `URL getUrl();` method is in parent `Node` interface,
in this way many interface need modify to be compatible,

1. Why would `getUrl()` in other place need to be modified? I think keep 
compatibility as needed would be enough, for those popular SPI extensions, such 
as Filter, Invoker, Result, ...

>user may call `RpcContext.getContext.setAttachment`.
2. Agree, compatible `com.alibaba.dubbo.common.RpcContext` now is not enough to 
guarantee comaptibility. 


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