Save annotation of restarts

This change will count the number of restarts for the populator pod on the destination PVC. That allows us to limit the number of recreations of the pod. After 3 attempts, it will stop recreating it. Signed-off-by: Liran Rotenberg <[email protected]>
kubev2v · Nov 12, 2023 · c4d645d · c4d645d
1 parent bbdd9ce
commit c4d645d
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Showing 2 changed files with 49 additions and 14 deletions.
diff --git a/pkg/controller/plan/migration.go b/pkg/controller/plan/migration.go
@@ -1580,10 +1580,6 @@ func (r *Migration) updatePopulatorCopyProgress(vm *plan.VMStatus, step *plan.St
 	if err != nil {
 		return
 	}
-	populatorPods, err := r.kubevirt.getPopulatorPods()
-	if err != nil {
-		return
-	}
 
 	for _, pvc := range pvcs {
 		if _, ok := pvc.Annotations["lun"]; ok {
@@ -1602,11 +1598,6 @@ func (r *Migration) updatePopulatorCopyProgress(vm *plan.VMStatus, step *plan.St
 			continue
 		}
 
-		_, err = r.isPopulatorFailed(populatorPods, string(pvc.UID))
-		if err != nil {
-			return
-		}
-
 		if pvc.Status.Phase == core.ClaimBound {
 			task.Phase = Completed
 			task.Reason = TransferCompleted
@@ -1622,25 +1613,39 @@ func (r *Migration) updatePopulatorCopyProgress(vm *plan.VMStatus, step *plan.St
 		}
 
 		percent := float64(transferredBytes/0x100000) / float64(task.Progress.Total)
-		task.Progress.Completed = int64(percent * float64(task.Progress.Total))
+		newProgress := int64(percent * float64(task.Progress.Total))
+		if newProgress == task.Progress.Completed {
+			pvcId := string(pvc.UID)
+			populatorFailed := r.isPopulatorPodFailed(pvcId)
+			if populatorFailed {
+				return fmt.Errorf("populator pod failed for PVC %s. Please check the pod logs", pvcId)
+			}
+		}
+		task.Progress.Completed = newProgress
 	}
 
 	step.ReflectTasks()
 	return
 }
 
-func (r *Migration) isPopulatorFailed(populatorPods []core.Pod, givenPvcId string) (bool, error) {
+// Checks if the populator pod failed when the progress didn't change
+func (r *Migration) isPopulatorPodFailed(givenPvcId string) bool {
+	populatorPods, err := r.kubevirt.getPopulatorPods()
+	if err != nil {
+		r.Log.Error(err, "couldn't get the populator pods")
+		return false
+	}
 	for _, pod := range populatorPods {
 		pvcId := pod.Name[len(PopulatorPodPrefix):]
 		if givenPvcId != pvcId {
 			continue
 		}
 		if pod.Status.Phase == core.PodFailed {
-			return true, fmt.Errorf("populator pod %s/%s failed for PVC %s. Please check the pod logs.", pod.Namespace, pod.Name, pvcId)
+			return true
 		}
 		break
 	}
-	return false, nil
+	return false
 }
 
 func (r *Migration) setPopulatorPodsWithLabels(vm *plan.VMStatus, migrationID string) {

diff --git a/pkg/lib-volume-populator/populator-machinery/controller.go b/pkg/lib-volume-populator/populator-machinery/controller.go
@@ -76,6 +76,7 @@ const (
 	reasonPVCCreationError   = "PopulatorPVCCreationError"
 	reasonPopulatorProgress  = "PopulatorProgress"
 	AnnDefaultNetwork        = "v1.multus-cni.io/default-network"
+	AnnPopulatorReCreations  = "recreations"
 
 	qemuGroup = 107
 )
@@ -696,7 +697,18 @@ func (c *controller) syncPvc(ctx context.Context, key, pvcNamespace, pvcName str
 
 		if corev1.PodSucceeded != pod.Status.Phase {
 			if corev1.PodFailed == pod.Status.Phase {
-				c.recorder.Eventf(pvc, corev1.EventTypeWarning, reasonPodFailed, "Populator failed: %s", pod.Status.Message)
+				restarts, ok := pvc.Annotations[AnnPopulatorReCreations]
+				if !ok {
+					return c.retryFailedPopulator(ctx, pvc, populatorNamespace, pod.Name, 1)
+				}
+				restartsInteger, err := strconv.Atoi(restarts)
+				if err != nil {
+					return err
+				}
+				if restartsInteger < 3 {
+					return c.retryFailedPopulator(ctx, pvc, populatorNamespace, pod.Name, restartsInteger+1)
+				}
+				c.recorder.Eventf(pvc, corev1.EventTypeWarning, reasonPodFailed, "Populator failed after few (3) attempts: Please check the logs of the populator pod, %s/%s", populatorNamespace, pod.Name)
 			}
 			// We'll get called again later when the pod succeeds
 			return nil
@@ -791,6 +803,24 @@ func (c *controller) syncPvc(ctx context.Context, key, pvcNamespace, pvcName str
 	return nil
 }
 
+func (c *controller) retryFailedPopulator(ctx context.Context, pvc *corev1.PersistentVolumeClaim, namespace, podName string, counter int) error {
+	pvc.Annotations[AnnPopulatorReCreations] = strconv.Itoa(counter)
+	err := c.updatePvc(ctx, pvc, namespace)
+	if err != nil {
+		return err
+	}
+	err = c.kubeClient.CoreV1().Pods(namespace).Delete(ctx, podName, metav1.DeleteOptions{})
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (c *controller) updatePvc(ctx context.Context, pvc *corev1.PersistentVolumeClaim, namespace string) (err error) {
+	_, err = c.kubeClient.CoreV1().PersistentVolumeClaims(namespace).Update(ctx, pvc, metav1.UpdateOptions{})
+	return err
+}
+
 func (c *controller) updateProgress(pvc *corev1.PersistentVolumeClaim, podIP string, cr *unstructured.Unstructured) error {
 	populatorKind := pvc.Spec.DataSourceRef.Kind
 	var diskRegex = regexp.MustCompile(fmt.Sprintf(`volume_populators_%s\{%s=\"([0-9a-fA-F]{8}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{12})"\} (\d{1,3}.*)`,