Hive-site.xml is unreachable when file is not in classpath and HIVE_CONF_DIR is set incorrectly.

If HIVE_CONF_DIR variable is not set and not in classpath, configurations have to rely on HIVE_HOME variable. But if HIVE_CONF_DIR is not set and HIVE_HOME is set, configs could not find hive-site.xml file.