Merge pull request #30948 from lavalamp/fix

Automatic merge from submit-queue

Do not hold the lock for a long time

Followup to #30839.

I'm not convinced this is a super great idea but I'll throw it out and let others decide.

Ref https://github.com/kubernetes/minikube/issues/368
Ref #30759

pkg/client/cache/delta_fifo.go

@@ -496,21 +496,34 @@ func (f *DeltaFIFO) Replace(list []interface{}, resourceVersion string) error {
 
 // Resync will send a sync event for each item
 func (f *DeltaFIFO) Resync() error {
+	var keys []string
+	func() {
+		f.lock.RLock()
+		defer f.lock.RUnlock()
+		keys = f.knownObjects.ListKeys()
+	}()
+	for _, k := range keys {
+		if err := f.syncKey(k); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (f *DeltaFIFO) syncKey(key string) error {
 	f.lock.Lock()
 	defer f.lock.Unlock()
-	for _, k := range f.knownObjects.ListKeys() {
-		obj, exists, err := f.knownObjects.GetByKey(k)
-		if err != nil {
-			glog.Errorf("Unexpected error %v during lookup of key %v, unable to queue object for sync", err, k)
-			continue
-		} else if !exists {
-			glog.Infof("Key %v does not exist in known objects store, unable to queue object for sync", k)
-			continue
-		}
+	obj, exists, err := f.knownObjects.GetByKey(key)
+	if err != nil {
+		glog.Errorf("Unexpected error %v during lookup of key %v, unable to queue object for sync", err, key)
+		return nil
+	} else if !exists {
+		glog.Infof("Key %v does not exist in known objects store, unable to queue object for sync", key)
+		return nil
+	}
 
-		if err := f.queueActionLocked(Sync, obj); err != nil {
-			return fmt.Errorf("couldn't queue object: %v", err)
-		}
+	if err := f.queueActionLocked(Sync, obj); err != nil {
+		return fmt.Errorf("couldn't queue object: %v", err)
 	}
 	return nil
 }