presto-hive/src/main/java/io/prestosql/plugin/hive/HiveHdfsConfiguration.java/HiveHdfsConfiguration/initialValue
class HiveHdfsConfiguration:        @Override
        protected Configuration initialValue()
        {
            Configuration configuration = new Configuration(false);
            copy(INITIAL_CONFIGURATION, configuration);
            initializer.initializeConfiguration(configuration);
            return configuration;
        }