code: @Override
    public void write(DataOutput out) throws IOException {
      Text.writeString(out, getHostName());
      out.writeInt(getNumCpu());
      out.writeDouble(getCpuTotalGHz());
      out.writeDouble(getMemTotalGB());
      out.writeDouble(getCpuUsageGHz());
      out.writeDouble(getMemUsageGB());
    }
docs: ////////////////////////////////////////////////