code: private AlluxioConfiguration mergeConfigurations(Map<String, Object> uriConfProperties,
        org.apache.hadoop.conf.Configuration conf, AlluxioProperties alluxioProps)
        throws IOException {
      // take the URI properties, hadoop configuration, and given Alluxio configuration and merge
      // all three into a single object.
      InstancedConfiguration newConf = HadoopConfigurationUtils.mergeHadoopConfiguration(conf,
          alluxioProps);
      // Connection details in the URI has the highest priority
      newConf.merge(uriConfProperties, Source.RUNTIME);
      return newConf;
    }
docs: Merges the URI configuration with the Hadoop and Alluxio configuration, returning an
  {@link AlluxioConfiguration} with all properties merged into one object.
  
  @param uriConfProperties the configuration properties from the input uri
  @param conf the hadoop conf
  @param alluxioProps Alluxio configuration properties