NM协议详解 #26

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## NameNode客户端协议详解
协议的定义主要在类NamenodeProtocols中。如下
```java
public interface NamenodeProtocols
extends ClientProtocol,
DatanodeProtocol,
DatanodeLifelineProtocol,
NamenodeProtocol,
RefreshAuthorizationPolicyProtocol,
ReconfigurationProtocol,
RefreshUserMappingsProtocol,
RefreshCallQueueProtocol,
GenericRefreshProtocol,
GetUserMappingsProtocol,
HAServiceProtocol {
}
```
其中NameNode相关的大多数在NamenodeProtocol当中。
### NamenodeProtocol 详解