public static String getNonMrEngines() {
    Set<String> engines = new HashSet<>(ConfVars.HIVE_EXECUTION_ENGINE.getValidStringValues());
    engines.remove("mr");
    String validNonMrEngines = String.join(", ", engines);
    LOG.debug("Valid non-MapReduce execution engines: {}", validNonMrEngines);
    return validNonMrEngines;
  }
@return true if HS2 webui query-info cache is enabled
common/src/java/org/apache/hadoop/hive/conf/HiveConf.java