Merge pull request #23141 from yujuhong/fix_race

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pkg/kubelet/config/config.go

@@ -238,16 +238,7 @@ func (s *podStorage) merge(source string, change interface{}) (adds, updates, de
 			}
 			recordFirstSeenTime(ref)
 			pods[name] = ref
-			// If a pod is not found in the cache, and it's also not in the
-			// pending phase, it implies that kubelet may have restarted.
-			// Treat this pod as update so that kubelet wouldn't reject the
-			// pod in the admission process.
-			if ref.Status.Phase != api.PodPending {
-				updatePods = append(updatePods, ref)
-			} else {
-				// this is an add
-				addPods = append(addPods, ref)
-			}
+			addPods = append(addPods, ref)
 		}
 	}
 

pkg/kubelet/config/config_test.go

@@ -74,9 +74,6 @@ func CreateValidPod(name, namespace string) *api.Pod {
 				},
 			},
 		},
-		Status: api.PodStatus{
-			Phase: api.PodPending,
-		},
 	}
 }
 

pkg/kubelet/kubelet.go

@@ -2386,6 +2386,10 @@ func (kl *Kubelet) syncLoopIteration(updates <-chan kubetypes.PodUpdate, handler
 		switch u.Op {
 		case kubetypes.ADD:
 			glog.V(2).Infof("SyncLoop (ADD, %q): %q", u.Source, format.Pods(u.Pods))
+			// After restarting, kubelet will get all existing pods through
+			// ADD as if they are new pods. These pods will then go through the
+			// admission process and *may* be rejcted. This can be resolved
+			// once we have checkpointing.
 			handler.HandlePodAdditions(u.Pods)
 		case kubetypes.UPDATE:
 			glog.V(2).Infof("SyncLoop (UPDATE, %q): %q", u.Source, format.Pods(u.Pods))