Merge pull request kubernetes-retired#651 from hex108/error

Return err in functions of session.go if any error occurs

pkg/scheduler/framework/session.go

@@ -193,10 +193,12 @@ func (ssn *Session) Pipeline(task *api.TaskInfo, hostname string) error {
 		if err := job.UpdateTaskStatus(task, api.Pipelined); err != nil {
 			glog.Errorf("Failed to update task <%v/%v> status to %v in Session <%v>: %v",
 				task.Namespace, task.Name, api.Pipelined, ssn.UID, err)
+			return err
 		}
 	} else {
 		glog.Errorf("Failed to found Job <%s> in Session <%s> index when binding.",
 			task.Job, ssn.UID)
+		return fmt.Errorf("failed to find job %s when binding", task.Job)
 	}
 
 	task.NodeName = hostname
@@ -205,12 +207,14 @@ func (ssn *Session) Pipeline(task *api.TaskInfo, hostname string) error {
 		if err := node.AddTask(task); err != nil {
 			glog.Errorf("Failed to add task <%v/%v> to node <%v> in Session <%v>: %v",
 				task.Namespace, task.Name, hostname, ssn.UID, err)
+			return err
 		}
 		glog.V(3).Infof("After added Task <%v/%v> to Node <%v>: idle <%v>, used <%v>, releasing <%v>",
 			task.Namespace, task.Name, node.Name, node.Idle, node.Used, node.Releasing)
 	} else {
 		glog.Errorf("Failed to found Node <%s> in Session <%s> index when binding.",
 			hostname, ssn.UID)
+		return fmt.Errorf("failed to find node %s", hostname)
 	}
 
 	for _, eh := range ssn.eventHandlers {
@@ -295,10 +299,12 @@ func (ssn *Session) dispatch(task *api.TaskInfo) error {
 		if err := job.UpdateTaskStatus(task, api.Binding); err != nil {
 			glog.Errorf("Failed to update task <%v/%v> status to %v in Session <%v>: %v",
 				task.Namespace, task.Name, api.Binding, ssn.UID, err)
+			return err
 		}
 	} else {
 		glog.Errorf("Failed to found Job <%s> in Session <%s> index when binding.",
 			task.Job, ssn.UID)
+		return fmt.Errorf("failed to find job %s", task.Job)
 	}
 
 	metrics.UpdateTaskScheduleDuration(metrics.Duration(task.Pod.CreationTimestamp.Time))
@@ -316,17 +322,20 @@ func (ssn *Session) Evict(reclaimee *api.TaskInfo, reason string) error {
 		if err := job.UpdateTaskStatus(reclaimee, api.Releasing); err != nil {
 			glog.Errorf("Failed to update task <%v/%v> status to %v in Session <%v>: %v",
 				reclaimee.Namespace, reclaimee.Name, api.Releasing, ssn.UID, err)
+			return err
 		}
 	} else {
 		glog.Errorf("Failed to found Job <%s> in Session <%s> index when binding.",
 			reclaimee.Job, ssn.UID)
+		return fmt.Errorf("failed to find job %s", reclaimee.Job)
 	}
 
 	// Update task in node.
 	if node, found := ssn.Nodes[reclaimee.NodeName]; found {
 		if err := node.UpdateTask(reclaimee); err != nil {
 			glog.Errorf("Failed to update task <%v/%v> in Session <%v>: %v",
 				reclaimee.Namespace, reclaimee.Name, ssn.UID, err)
+			return err
 		}
 	}