// Launch Task
if (HiveConf.getBoolVar(conf, HiveConf.ConfVars.EXECPARALLEL) && tsk.isMapRedTask()) {
// Launch it in the parallel mode, as a separate thread only for MR tasks
tskRun.start();
} else {
tskRun.runSequential();
}
running.put(tskRes, tskRun);
return;
}