public static Map<String, Object> getConfigurationFromHadoop(
      org.apache.hadoop.conf.Configuration hadoopConf) {
    Map<String, Object> alluxioConfProperties = new HashMap<>();
    // Load any Alluxio configuration parameters in the Hadoop configuration.
    for (Map.Entry<String, String> entry : hadoopConf) {
      String propertyName = entry.getKey();
      if (PropertyKey.isValid(propertyName)) {
        alluxioConfProperties.put(propertyName, entry.getValue());
      }
    }
    return alluxioConfProperties;
  }
@Test
  public void mergeEmptyHadoopConfiguration() {
    org.apache.hadoop.conf.Configuration hadoopConfig = new org.apache.hadoop.conf.Configuration();
    mConf.merge(
        HadoopConfigurationUtils.getConfigurationFromHadoop(hadoopConfig), Source.RUNTIME);
    assertFalse(mConf.getBoolean(PropertyKey.ZOOKEEPER_ENABLED));
  }