When the nn1 fails at very beginning, admin command that waits exist safe mode fails

//DFSAdmin.class

public void setSafeMode(String[] argv, int idx) throws IOException {

…

if (isHaEnabled) {
      String nsId = dfsUri.getHost();
      List<ProxyAndInfo<ClientProtocol>> proxies =
          HAUtil.getProxiesForAllNameNodesInNameservice(
          dfsConf, nsId, ClientProtocol.class);
      for (ProxyAndInfo<ClientProtocol> proxy : proxies) {
        ClientProtocol haNn = proxy.getProxy();
        //The code always queries from the first nn, i.e., nn1, and returns with IOException when nn1 fails.
        boolean inSafeMode = haNn.setSafeMode(action, false);
        if (waitExitSafe) {
          inSafeMode = waitExitSafeMode(haNn, inSafeMode);
        }
        System.out.println("Safe mode is " + (inSafeMode ? "ON" : "OFF")
            + " in " + proxy.getAddress());
      }
    } 
…
}