fix the attached binding deletion problem

Signed-off-by: whitewindmills <jayfantasyhjh@gmail.com>

pkg/dependenciesdistributor/dependencies_distributor.go

@@ -568,6 +568,13 @@ func (d *DependenciesDistributor) createOrUpdateAttachedBinding(attachedBinding
 	bindingKey := client.ObjectKeyFromObject(attachedBinding)
 	err := d.Client.Get(context.TODO(), bindingKey, existBinding)
 	if err == nil {
+		// When a dependent resource is deleted, it's ResourceBinding deletion may be delayed, depending on the system load status.
+		// If it is recreated again, it's ResourceBinding may not be recreated because the previous ResourceBinding deletion has not yet completed.
+		// We return an error here to wait for it's ResourceBinding deletion to complete, this will ensure it's ResourceBinding is recreated correctly.
+		if !existBinding.DeletionTimestamp.IsZero() {
+			return fmt.Errorf("unable to update resourceBinding(%s) because it's being deleted", bindingKey)
+		}
+
 		// If the spec.Placement is nil, this means that existBinding is generated by the dependency mechanism.
 		// If the spec.Placement is not nil, then it must be generated by PropagationPolicy.
 		if existBinding.Spec.Placement == nil {