import org.apache.hadoop.mapreduce.v2.api.HSClientProtocolPB; //导入依赖的package包/类
@Override
public KerberosInfo getKerberosInfo(Class<?> protocol, Configuration conf) {
  if (!protocol
      .equals(HSClientProtocolPB.class)) {
    return null;
  }
  return new KerberosInfo() {

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

    @Override
    public String serverPrincipal() {
      return JHAdminConfig.MR_HISTORY_PRINCIPAL;
    }

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

import org.apache.hadoop.mapreduce.v2.api.HSClientProtocolPB; //导入依赖的package包/类
@Override
public TokenInfo getTokenInfo(Class<?> protocol, Configuration conf) {
  if (!protocol
      .equals(HSClientProtocolPB.class)) {
    return null;
  }
  return new TokenInfo() {

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

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

import org.apache.hadoop.mapreduce.v2.api.HSClientProtocolPB; //导入依赖的package包/类
public HSClientProtocolPBClientImpl(long clientVersion,
    InetSocketAddress addr, Configuration conf) throws IOException {
  super();
  RPC.setProtocolEngine(conf, HSClientProtocolPB.class,
      ProtobufRpcEngine.class);
  proxy = (HSClientProtocolPB)RPC.getProxy(
      HSClientProtocolPB.class, clientVersion, addr, conf);
}