fix vmss dirty cache issue

add logging

Author: andyzhangx

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

@@ -88,9 +88,7 @@ func (ss *scaleSet) AttachDisk(isManagedDisk bool, diskName, diskURI string, nod
 	defer cancel()
 
 	// Invalidate the cache right after updating
-	if err = ss.deleteCacheForNode(vmName); err != nil {
-		return err
-	}
+	defer ss.deleteCacheForNode(vmName)
 
 	klog.V(2).Infof("azureDisk - update(%s): vm(%s) - attach disk(%s, %s) with DiskEncryptionSetID(%s)", nodeResourceGroup, nodeName, diskName, diskURI, diskEncryptionSetID)
 	_, err = ss.VirtualMachineScaleSetVMsClient.Update(ctx, nodeResourceGroup, ssName, instanceID, newVM, "attach_disk")
@@ -160,9 +158,7 @@ func (ss *scaleSet) DetachDisk(diskName, diskURI string, nodeName types.NodeName
 	defer cancel()
 
 	// Invalidate the cache right after updating
-	if err = ss.deleteCacheForNode(vmName); err != nil {
-		return nil, err
-	}
+	defer ss.deleteCacheForNode(vmName)
 
 	klog.V(2).Infof("azureDisk - update(%s): vm(%s) - detach disk(%s, %s)", nodeResourceGroup, nodeName, diskName, diskURI)
 	return ss.VirtualMachineScaleSetVMsClient.Update(ctx, nodeResourceGroup, ssName, instanceID, newVM, "detach_disk")

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

@@ -850,10 +850,8 @@ func (ss *scaleSet) EnsureHostInPool(service *v1.Service, nodeName types.NodeNam
 		return err
 	}
 
-	// Invalidate the cache since we would update it.
-	if err = ss.deleteCacheForNode(vmName); err != nil {
-		return err
-	}
+	// Invalidate the cache since right after update
+	defer ss.deleteCacheForNode(vmName)
 
 	// Update vmssVM with backoff.
 	ctx, cancel := getContextWithCancel()
@@ -1129,10 +1127,8 @@ func (ss *scaleSet) ensureBackendPoolDeletedFromNode(service *v1.Service, nodeNa
 		return err
 	}
 
-	// Invalidate the cache since we would update it.
-	if err = ss.deleteCacheForNode(nodeName); err != nil {
-		return err
-	}
+	// Invalidate the cache since right after update
+	defer ss.deleteCacheForNode(nodeName)
 
 	// Update vmssVM with backoff.
 	ctx, cancel := getContextWithCancel()

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

@@ -117,6 +117,7 @@ func (ss *scaleSet) newVMSSVirtualMachinesCache() (*timedCache, error) {
 func (ss *scaleSet) deleteCacheForNode(nodeName string) error {
 	cached, err := ss.vmssVMCache.Get(vmssVirtualMachinesKey, cacheReadTypeUnsafe)
 	if err != nil {
+		klog.Errorf("deleteCacheForNode(%s) failed with error: %v", nodeName, err)
 		return err
 	}