private void loadAuthorCache(TrimProperties properties) {
    conf.setAuthorCacheSize(
        Integer.parseInt(
            properties.getProperty(
                "author_cache_size", String.valueOf(conf.getAuthorCacheSize()))));
    conf.setAuthorCacheExpireTime(
        Integer.parseInt(
            properties.getProperty(
                "author_cache_expire_time", String.valueOf(conf.getAuthorCacheExpireTime()))));
  }
load a property file and set TsfileDBConfig variables.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/conf/IoTDBDescriptor.java