private function createTableIfNoExist()
 {
     exec("sh hive_tool.sh hql \"DESC iknowetl_" . parent::$app . "\"", $out, $ret);
     if ($ret != 0) {
         $fileHql = ETL_APP . parent::$app . "/event/" . parent::$app . ".hql";
         if (0 != exec("sh hive_tool.sh fhql {$fileHql}")) {
             Bd_Conf::warning("Failed: Cannot create table" . parent::$app);
             return false;
         }
     }
 }