Fix the VMSS name and resource group name when updating VMSS for LoadBalancer backendPools.

Author: feiskyer

staging/src/k8s.io/legacy-cloud-providers/azure/azure_vmss.go

@@ -917,6 +917,7 @@ func getVmssAndResourceGroupNameByVMProviderID(providerID string) (string, strin
 }
 
 func (ss *scaleSet) ensureVMSSInPool(service *v1.Service, nodes []*v1.Node, backendPoolID string, vmSetName string) error {
+	klog.V(2).Infof("ensureVMSSInPool: ensuring VMSS with backendPoolID %s", backendPoolID)
 	vmssNamesMap := make(map[string]bool)
 
 	// the standard load balancer supports multiple vmss in its backend while the basic sku doesn't
@@ -926,7 +927,7 @@ func (ss *scaleSet) ensureVMSSInPool(service *v1.Service, nodes []*v1.Node, back
 				continue
 			}
 			// in this scenario the vmSetName is an empty string and the name of vmss should be obtained from the provider IDs of nodes
-			vmssName, resourceGroupName, err := getVmssAndResourceGroupNameByVMProviderID(node.Spec.ProviderID)
+			resourceGroupName, vmssName, err := getVmssAndResourceGroupNameByVMProviderID(node.Spec.ProviderID)
 			if err != nil {
 				klog.V(4).Infof("ensureVMSSInPool: found VMAS node %s, will skip checking and continue", node.Name)
 				continue
@@ -940,6 +941,7 @@ func (ss *scaleSet) ensureVMSSInPool(service *v1.Service, nodes []*v1.Node, back
 		vmssNamesMap[vmSetName] = true
 	}
 
+	klog.V(2).Infof("ensureVMSSInPool begins to update VMSS %v with backendPoolID %s", vmssNamesMap, backendPoolID)
 	for vmssName := range vmssNamesMap {
 		vmss, err := ss.getVMSS(vmssName, azcache.CacheReadTypeDefault)
 		if err != nil {