code: public void errorReport(DatanodeRegistration registration,
                            int errorCode, 
                            String msg) throws IOException {
      for (int i = 0; i < numProtocol; i++) {
        try {
          if (node[i] != null) {
            node[i].errorReport(registration, errorCode, msg);
          }
        } catch (IOException e) {
          LOG.info("Server " + i + " failed at errorReport.", e);
        }
      }
    }
docs: {@inheritDoc}