presto-hive/src/main/java/io/prestosql/plugin/hive/s3/HiveS3Module.java/HiveS3Module/initializeConfiguration
class HiveS3Module:        @Override
        public void initializeConfiguration(Configuration config)
        {
            // re-map filesystem schemes to use the Amazon EMR file system
            config.set("fs.s3.impl", EMR_FS_CLASS_NAME);
            config.set("fs.s3a.impl", EMR_FS_CLASS_NAME);
            config.set("fs.s3n.impl", EMR_FS_CLASS_NAME);
        }