fix bug

server/workerManager.go

@@ -369,10 +369,12 @@ func (wm *WorkerManager) manageWorker(worker *Worker) error {
 				if err == nil {
 					// add task to cache.
 					worker.recentTask.Add(task.TaskId, task)
+					if task.TaskKind == odysseus.TaskKind_ComputeTask {
 						if e := wm.setWorkerLastTaskTime(worker, time.Now().Unix()); e != nil {
 							log.WithField("worker", worker.uuid).WithError(e).Error("set worker last task time failed")
 						}
 					}
+				}
 				log.WithField("worker", worker.uuid).Info("dispatch task to worker")
 
 				select {