public KeyValueServerInterfaceImpl(String server_name, int instance_capibility)
      throws RemoteException {
    this.server_name = server_name;
    // loghelper = new LogHelper(server_name+"_log");
    INS_NUM = 0;

    work = true;

    for (int i = 1; i <= instance_capibility; i++) instances.put(new Integer(i), new Instance());
  }