private static String initHiveLog4jCommon(ConfVars confVarName)
      throws LogInitializationException {
    HiveConf conf = new HiveConf();
    return initHiveLog4jCommon(conf, confVarName);
  }
Initialize log4j for execution mode.

@return an message suitable for display to the user
@throws LogInitializationException if log4j-exec fails to initialize correctly
common/src/java/org/apache/hadoop/hive/common/LogUtils.java