public Properties addHiveconfToSystemProperties() {
    Properties confProps = commandLine.getOptionProperties("hiveconf");
    for (String propKey : confProps.stringPropertyNames()) {
      if (verbose) {
        System.err.println(
            "hiveconf: " + propKey + "=" + confProps.getProperty(propKey));
      }
      if (propKey.equalsIgnoreCase("hive.root.logger")) {
        splitAndSetLogger(propKey, confProps);
      } else {
        System.setProperty(propKey, confProps.getProperty(propKey));
      }
    }
    return confProps;
  }
Add the hiveconf properties to the Java system properties, override
anything therein.

@return a copy of the properties specified in hiveconf
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/utils/CommonCliOptions.java