hadoop的RPC实例实现

import java.io.IOException;import java.net.InetSocketAddress;import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.ipc.RPC;public class RPCClient {    public static void main(String[] args) throws IOException {        Barty proxy = RPC.getProxy(Barty.class, 10010,                new InetSocketAddress("192.168.8.100", 9527), new Configuration());        String sayHi = proxy.sayHi("tomcat");        System.out.println(sayHi);    }}

import java.io.IOException;import org.apache.hadoop.HadoopIllegalArgumentException;import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.ipc.RPC;import org.apache.hadoop.ipc.RPC.Server;public class RPCServer implements Barty{    public static void main(String[] args) throws HadoopIllegalArgumentException, IOException {        Server server = new RPC.Builder(new Configuration())            .setInstance(new RPCServer())            .setBindAddress("192.168.8.100")            .setPort(9527)            .setProtocol(Barty.class)            .build();        server.start();    }    @Override    public String sayHi(String name) {        // TODO Auto-generated method stub        return "HI~" + name;    }}

public interface Barty {    public static final long versionID = 10010;    public String sayHi(String name);}

RPC是不同进程之间的方法调用。在hadoop上创建一个接口，可以在Service和client之间通信。底层的实现也用的是socket通信机制。