public static List<TConfigNodeLocation> loadConfigNodeList()
      throws IOException, BadNodeUrlException {
    Properties systemProperties = systemPropertiesHandler.read();
    String addresses = systemProperties.getProperty("config_node_list", null);

    if (addresses != null && !addresses.isEmpty()) {
      return NodeUrlUtils.parseTConfigNodeUrls(addresses);
    } else {
      return new ArrayList<>();
    }
  }
Load the config_node_list in confignode-system.properties file. We only invoke this interface
when restarted.

@return The property of config_node_list in confignode-system.properties file
@throws IOException When load confignode-system.properties file failed
@throws BadNodeUrlException When parsing config_node_list failed
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/conf/SystemPropertiesUtils.java