NameNode ,DataNode启动

 NameNode

public static void main(String argv[]) throws Exception {
    try {
      StringUtils.startupShutdownMessage(NameNode.class, argv, LOG);
      NameNode namenode = createNameNode(argv, null);
      if (namenode != null)
        namenode.join();
    } catch (Throwable e) {
      LOG.error(StringUtils.stringifyException(e));
      System.exit(-1);
    }
  }

DataNode

public static void main(String args[]) {
    try {
      StringUtils.startupShutdownMessage(DataNode.class, args, LOG);
      DataNode datanode = createDataNode(args, null);
      if (datanode != null)
        datanode.join();
    } catch (Throwable e) {
      LOG.error(StringUtils.stringifyException(e));
      System.exit(-1);
    }
  }