Yarn中的DEFAULT_IPC_RPC_IMPL(default rpc 实现类)

package org.apache.hadoop.yarn.ipc;


import java.net.InetSocketAddress;


import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.ipc.Server;
import org.apache.hadoop.security.token.SecretManager;
import org.apache.hadoop.security.token.TokenIdentifier;
import org.apache.hadoop.yarn.factory.providers.RpcFactoryProvider;


/**
 * This uses Hadoop RPC. Uses a tunnel ProtoSpecificRpcEngine over 
 * Hadoop connection.
 * This does not give cross-language wire compatibility, since the Hadoop 
 * RPC wire format is non-standard, but it does permit use of Protocol Buffers
 *  protocol versioning features for inter-Java RPCs.
 */

@InterfaceAudience.LimitedPrivate({ "MapReduce", "YARN" })

public class HadoopYarnProtoRPC extends YarnRPC {


  private static final Log LOG = LogFactory.getLog(HadoopYarnProtoRPC.class);


  @Override
  public Object getProxy(Class protocol, InetSocketAddress addr,
      Configuration conf) {
    LOG.debug("Creating a HadoopYarnProtoRpc proxy for protocol " + protocol);
    return RpcFactoryProvider.getClientFactory(conf).getClient(protocol, 1,
        addr, conf);
  }


  @Override
  public void stopProxy(Object proxy, Configuration conf) {
    RpcFactoryProvider.getClientFactory(conf).stopClient(proxy);
  }


  @Override
  public Server getServer(Class protocol, Object instance,
      InetSocketAddress addr, Configuration conf,
      SecretManager<? extends TokenIdentifier> secretManager,
      int numHandlers, String portRangeConfig) {
    LOG.debug("Creating a HadoopYarnProtoRpc server for protocol " + protocol + 
        " with " + numHandlers + " handlers");
    
    return RpcFactoryProvider.getServerFactory(conf).getServer(protocol, 
        instance, addr, conf, secretManager, numHandlers, portRangeConfig);


  }

}

构建client 端与resource manager端的远程服务