private void registerUdfServices() throws StartupException {
    registerManager.register(TemporaryQueryDataFileService.getInstance());
    registerManager.register(UDFClassLoaderManager.setupAndGetInstance(config.getUdfDir()));
  }
Generate dataNodeConfiguration. Warning: Don't private this method !!!

@return TDataNodeConfiguration
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/service/DataNode.java