import org.apache.hadoop.yarn.api.ApplicationClientProtocolPB; //导入依赖的package包/类
@Override
public KerberosInfo getKerberosInfo(Class<?> protocol, Configuration conf) {
  if (!protocol
      .equals(ApplicationClientProtocolPB.class)) {
    return null;
  }
  return new KerberosInfo() {

    @Override
    public Class<? extends Annotation> annotationType() {
      return null;
    }

    @Override
    public String serverPrincipal() {
      return YarnConfiguration.RM_PRINCIPAL;
    }

    @Override
    public String clientPrincipal() {
      return null;
    }
  };
}
 

import org.apache.hadoop.yarn.api.ApplicationClientProtocolPB; //导入依赖的package包/类
@Override
public TokenInfo getTokenInfo(Class<?> protocol, Configuration conf) {
  if (!protocol
      .equals(ApplicationClientProtocolPB.class)) {
    return null;
  }
  return new TokenInfo() {

    @Override
    public Class<? extends Annotation> annotationType() {
      return null;
    }

    @Override
    public Class<? extends TokenSelector<? extends TokenIdentifier>>
        value() {
      return RMDelegationTokenSelector.class;
    }
  };
}
 

import org.apache.hadoop.yarn.api.ApplicationClientProtocolPB; //导入依赖的package包/类
public ApplicationClientProtocolPBClientImpl(long clientVersion,
    InetSocketAddress addr, Configuration conf) throws IOException {
  RPC.setProtocolEngine(conf, ApplicationClientProtocolPB.class,
    ProtobufRpcEngine.class);
  proxy = RPC.getProxy(ApplicationClientProtocolPB.class, clientVersion, addr, conf);
}