private static void runDistEclatOnce() {
   if (!distEclatHasRun) {
     try {
       delete(new File(Dist_Eclat_Output_File));
       DistEclatDriver.main(new String[] {Dist_Eclat_Config_File});
     } catch (Exception e) {
       throw new IllegalStateException(e);
     }
   }
   distEclatHasRun = true;
 }