import org.apache.hadoop.mapreduce.v2.app.webapp.AMWebApp; //导入依赖的package包/类
protected void serviceStart() throws Exception {
  Configuration conf = getConfig();
  YarnRPC rpc = YarnRPC.create(conf);
  InetSocketAddress address = new InetSocketAddress(0);

  server =
      rpc.getServer(MRClientProtocol.class, protocolHandler, address,
          conf, appContext.getClientToAMTokenSecretManager(),
          conf.getInt(MRJobConfig.MR_AM_JOB_CLIENT_THREAD_COUNT, 
              MRJobConfig.DEFAULT_MR_AM_JOB_CLIENT_THREAD_COUNT),
              MRJobConfig.MR_AM_JOB_CLIENT_PORT_RANGE);
  
  // Enable service authorization?
  if (conf.getBoolean(
      CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHORIZATION, 
      false)) {
    refreshServiceAcls(conf, new MRAMPolicyProvider());
  }

  server.start();
  this.bindAddress = NetUtils.createSocketAddrForHost(appContext.getNMHostname(),
      server.getListenerAddress().getPort());
  LOG.info("Instantiated MRClientService at " + this.bindAddress);
  try {
    // Explicitly disabling SSL for map reduce task as we can't allow MR users
    // to gain access to keystore file for opening SSL listener. We can trust
    // RM/NM to issue SSL certificates but definitely not MR-AM as it is
    // running in user-land.
    webApp =
        WebApps.$for("mapreduce", AppContext.class, appContext, "ws")
          .withHttpPolicy(conf, Policy.HTTP_ONLY).start(new AMWebApp());
  } catch (Exception e) {
    LOG.error("Webapps failed to start. Ignoring for now:", e);
  }
  super.serviceStart();
}
 

import org.apache.hadoop.mapreduce.v2.app.webapp.AMWebApp; //导入依赖的package包/类
protected void serviceStart() throws Exception {
  Configuration conf = getConfig();
  YarnRPC rpc = YarnRPC.create(conf);
  InetSocketAddress address = new InetSocketAddress(0);

  server =
      rpc.getServer(MRClientProtocol.class, protocolHandler, address,
          conf, appContext.getClientToAMTokenSecretManager(),
          conf.getInt(MRJobConfig.MR_AM_JOB_CLIENT_THREAD_COUNT, 
              MRJobConfig.DEFAULT_MR_AM_JOB_CLIENT_THREAD_COUNT),
              MRJobConfig.MR_AM_JOB_CLIENT_PORT_RANGE);
  
  // Enable service authorization?
  if (conf.getBoolean(
      CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHORIZATION, 
      false)) {
    refreshServiceAcls(conf, new MRAMPolicyProvider());
  }

  server.start();
  this.bindAddress = NetUtils.getConnectAddress(server);
  LOG.info("Instantiated MRClientService at " + this.bindAddress);
  try {
    webApp = WebApps.$for("mapreduce", AppContext.class, appContext, "ws").with(conf).
        start(new AMWebApp());
  } catch (Exception e) {
    LOG.error("Webapps failed to start. Ignoring for now:", e);
  }
  super.serviceStart();
}
 

import org.apache.hadoop.mapreduce.v2.app.webapp.AMWebApp; //导入依赖的package包/类
protected void serviceStart() throws Exception {
  Configuration conf = getConfig();
  YarnRPC rpc = YarnRPC.create(conf);
  InetSocketAddress address = new InetSocketAddress(0);

  server =
      rpc.getServer(MRClientProtocol.class, protocolHandler, address,
          conf, appContext.getClientToAMTokenSecretManager(),
          conf.getInt(MRJobConfig.MR_AM_JOB_CLIENT_THREAD_COUNT, 
              MRJobConfig.DEFAULT_MR_AM_JOB_CLIENT_THREAD_COUNT),
              MRJobConfig.MR_AM_JOB_CLIENT_PORT_RANGE);
  
  // Enable service authorization?
  if (conf.getBoolean(
      CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHORIZATION, 
      false)) {
    refreshServiceAcls(conf, new MRAMPolicyProvider());
  }

  server.start();
  this.bindAddress = NetUtils.getConnectAddress(server);
  LOG.info("Instantiated MRClientService at " + this.bindAddress);
  try {
    // Explicitly disabling SSL for map reduce task as we can't allow MR users
    // to gain access to keystore file for opening SSL listener. We can trust
    // RM/NM to issue SSL certificates but definitely not MR-AM as it is
    // running in user-land.
    webApp =
        WebApps.$for("mapreduce", AppContext.class, appContext, "ws")
          .withHttpPolicy(conf, Policy.HTTP_ONLY).start(new AMWebApp());
  } catch (Exception e) {
    LOG.error("Webapps failed to start. Ignoring for now:", e);
  }
  super.serviceStart();
}