Fix collisions issues / timeouts for mounts

For non-attachable volumes, do not call GetVolumeName on the plugin and instead
generate a unique name based on the identity of the pod and the name of the volume
within the pod.

pkg/controller/volume/attachdetach/cache/actual_state_of_world.go

@@ -224,7 +224,7 @@ type nodeToUpdateStatusFor struct {
 }
 
 func (asw *actualStateOfWorld) MarkVolumeAsAttached(
-	volumeSpec *volume.Spec, nodeName string, devicePath string) error {
+	_ api.UniqueVolumeName, volumeSpec *volume.Spec, nodeName string, devicePath string) error {
 	_, err := asw.AddVolumeNode(volumeSpec, nodeName, devicePath)
 	return err
 }

pkg/kubelet/volumemanager/cache/actual_state_of_world.go

@@ -51,14 +51,6 @@ type ActualStateOfWorld interface {
 	// operationexecutor to interact with it.
 	operationexecutor.ActualStateOfWorldAttacherUpdater
 
-	// AddVolume adds the given volume to the cache indicating the specified
-	// volume is attached to this node. A unique volume name is generated from
-	// the volumeSpec and returned on success.
-	// If a volume with the same generated name already exists, this is a noop.
-	// If no volume plugin can support the given volumeSpec or more than one
-	// plugin can support it, an error is returned.
-	AddVolume(volumeSpec *volume.Spec, devicePath string) (api.UniqueVolumeName, error)
-
 	// AddPodToVolume adds the given pod to the given volume in the cache
 	// indicating the specified volume has been successfully mounted to the
 	// specified pod.
@@ -274,9 +266,8 @@ type mountedPod struct {
 }
 
 func (asw *actualStateOfWorld) MarkVolumeAsAttached(
-	volumeSpec *volume.Spec, nodeName string, devicePath string) error {
-	_, err := asw.AddVolume(volumeSpec, devicePath)
-	return err
+	volumeName api.UniqueVolumeName, volumeSpec *volume.Spec, _, devicePath string) error {
+	return asw.addVolume(volumeName, volumeSpec, devicePath)
 }
 
 func (asw *actualStateOfWorld) MarkVolumeAsDetached(
@@ -315,28 +306,35 @@ func (asw *actualStateOfWorld) MarkDeviceAsUnmounted(
 	return asw.SetVolumeGloballyMounted(volumeName, false /* globallyMounted */)
 }
 
-func (asw *actualStateOfWorld) AddVolume(
-	volumeSpec *volume.Spec, devicePath string) (api.UniqueVolumeName, error) {
+// addVolume adds the given volume to the cache indicating the specified
+// volume is attached to this node. If no volume name is supplied, a unique
+// volume name is generated from the volumeSpec and returned on success. If a
+// volume with the same generated name already exists, this is a noop. If no
+// volume plugin can support the given volumeSpec or more than one plugin can
+// support it, an error is returned.
+func (asw *actualStateOfWorld) addVolume(
+	volumeName api.UniqueVolumeName, volumeSpec *volume.Spec, devicePath string) error {
 	asw.Lock()
 	defer asw.Unlock()
 
 	volumePlugin, err := asw.volumePluginMgr.FindPluginBySpec(volumeSpec)
 	if err != nil || volumePlugin == nil {
-		return "", fmt.Errorf(
+		return fmt.Errorf(
 			"failed to get Plugin from volumeSpec for volume %q err=%v",
 			volumeSpec.Name(),
 			err)
 	}
 
-	volumeName, err :=
-		volumehelper.GetUniqueVolumeNameFromSpec(volumePlugin, volumeSpec)
+	if len(volumeName) == 0 {
+		volumeName, err = volumehelper.GetUniqueVolumeNameFromSpec(volumePlugin, volumeSpec)
 		if err != nil {
-		return "", fmt.Errorf(
+			return fmt.Errorf(
 				"failed to GetUniqueVolumeNameFromSpec for volumeSpec %q using volume plugin %q err=%v",
 				volumeSpec.Name(),
 				volumePlugin.GetPluginName(),
 				err)
 		}
+	}
 
 	pluginIsAttachable := false
 	if _, ok := volumePlugin.(volume.AttachableVolumePlugin); ok {
@@ -357,7 +355,7 @@ func (asw *actualStateOfWorld) AddVolume(
 		asw.attachedVolumes[volumeName] = volumeObj
 	}
 
-	return volumeObj.volumeName, nil
+	return nil
 }
 
 func (asw *actualStateOfWorld) AddPodToVolume(

pkg/kubelet/volumemanager/cache/actual_state_of_world_test.go

@@ -26,12 +26,14 @@ import (
 	"k8s.io/kubernetes/pkg/volume/util/volumehelper"
 )
 
-// Calls AddVolume() once to add volume
+var emptyVolumeName = api.UniqueVolumeName("")
+
+// Calls MarkVolumeAsAttached() once to add volume
 // Verifies newly added volume exists in GetUnmountedVolumes()
 // Verifies newly added volume doesn't exist in GetGloballyMountedVolumes()
-func Test_AddVolume_Positive_NewVolume(t *testing.T) {
+func Test_MarkVolumeAsAttached_Positive_NewVolume(t *testing.T) {
 	// Arrange
-	volumePluginMgr, _ := volumetesting.GetTestVolumePluginMgr(t)
+	volumePluginMgr, plugin := volumetesting.GetTestVolumePluginMgr(t)
 	asw := NewActualStateOfWorld("mynode" /* nodeName */, volumePluginMgr)
 	pod := &api.Pod{
 		ObjectMeta: api.ObjectMeta{
@@ -53,13 +55,14 @@ func Test_AddVolume_Positive_NewVolume(t *testing.T) {
 	}
 	volumeSpec := &volume.Spec{Volume: &pod.Spec.Volumes[0]}
 	devicePath := "fake/device/path"
+	generatedVolumeName, _ := volumehelper.GetUniqueVolumeNameFromSpec(plugin, volumeSpec)
 
 	// Act
-	generatedVolumeName, err := asw.AddVolume(volumeSpec, devicePath)
+	err := asw.MarkVolumeAsAttached(emptyVolumeName, volumeSpec, "" /* nodeName */, devicePath)
 
 	// Assert
 	if err != nil {
-		t.Fatalf("AddVolume failed. Expected: <no error> Actual: <%v>", err)
+		t.Fatalf("MarkVolumeAsAttached failed. Expected: <no error> Actual: <%v>", err)
 	}
 
 	verifyVolumeExistsAsw(t, generatedVolumeName, true /* shouldExist */, asw)
@@ -67,13 +70,57 @@ func Test_AddVolume_Positive_NewVolume(t *testing.T) {
 	verifyVolumeDoesntExistInGloballyMountedVolumes(t, generatedVolumeName, asw)
 }
 
-// Calls AddVolume() twice to add the same volume
+// Calls MarkVolumeAsAttached() once to add volume, specifying a name --
+// establishes that the supplied volume name is used to register the volume
+// rather than the generated one.
+// Verifies newly added volume exists in GetUnmountedVolumes()
+// Verifies newly added volume doesn't exist in GetGloballyMountedVolumes()
+func Test_MarkVolumeAsAttached_SuppliedVolumeName_Positive_NewVolume(t *testing.T) {
+	// Arrange
+	volumePluginMgr, _ := volumetesting.GetTestVolumePluginMgr(t)
+	asw := NewActualStateOfWorld("mynode" /* nodeName */, volumePluginMgr)
+	pod := &api.Pod{
+		ObjectMeta: api.ObjectMeta{
+			Name: "pod1",
+			UID:  "pod1uid",
+		},
+		Spec: api.PodSpec{
+			Volumes: []api.Volume{
+				{
+					Name: "volume-name",
+					VolumeSource: api.VolumeSource{
+						GCEPersistentDisk: &api.GCEPersistentDiskVolumeSource{
+							PDName: "fake-device1",
+						},
+					},
+				},
+			},
+		},
+	}
+	volumeSpec := &volume.Spec{Volume: &pod.Spec.Volumes[0]}
+	devicePath := "fake/device/path"
+	volumeName := api.UniqueVolumeName("this-would-never-be-a-volume-name")
+
+	// Act
+	err := asw.MarkVolumeAsAttached(volumeName, volumeSpec, "" /* nodeName */, devicePath)
+
+	// Assert
+	if err != nil {
+		t.Fatalf("MarkVolumeAsAttached failed. Expected: <no error> Actual: <%v>", err)
+	}
+
+	verifyVolumeExistsAsw(t, volumeName, true /* shouldExist */, asw)
+	verifyVolumeExistsInUnmountedVolumes(t, volumeName, asw)
+	verifyVolumeDoesntExistInGloballyMountedVolumes(t, volumeName, asw)
+}
+
+// Calls MarkVolumeAsAttached() twice to add the same volume
 // Verifies second call doesn't fail
 // Verifies newly added volume exists in GetUnmountedVolumes()
 // Verifies newly added volume doesn't exist in GetGloballyMountedVolumes()
-func Test_AddVolume_Positive_ExistingVolume(t *testing.T) {
+func Test_MarkVolumeAsAttached_Positive_ExistingVolume(t *testing.T) {
 	// Arrange
-	volumePluginMgr, _ := volumetesting.GetTestVolumePluginMgr(t)
+	volumePluginMgr, plugin := volumetesting.GetTestVolumePluginMgr(t)
 	devicePath := "fake/device/path"
 	asw := NewActualStateOfWorld("mynode" /* nodeName */, volumePluginMgr)
 	pod := &api.Pod{
@@ -94,19 +141,20 @@ func Test_AddVolume_Positive_ExistingVolume(t *testing.T) {
 			},
 		},
 	}
-
 	volumeSpec := &volume.Spec{Volume: &pod.Spec.Volumes[0]}
-	generatedVolumeName, err := asw.AddVolume(volumeSpec, devicePath)
+	generatedVolumeName, _ := volumehelper.GetUniqueVolumeNameFromSpec(plugin, volumeSpec)
+
+	err := asw.MarkVolumeAsAttached(emptyVolumeName, volumeSpec, "" /* nodeName */, devicePath)
 	if err != nil {
-		t.Fatalf("AddVolume failed. Expected: <no error> Actual: <%v>", err)
+		t.Fatalf("MarkVolumeAsAttached failed. Expected: <no error> Actual: <%v>", err)
 	}
 
 	// Act
-	generatedVolumeName, err = asw.AddVolume(volumeSpec, devicePath)
+	err = asw.MarkVolumeAsAttached(emptyVolumeName, volumeSpec, "" /* nodeName */, devicePath)
 
 	// Assert
 	if err != nil {
-		t.Fatalf("AddVolume failed. Expected: <no error> Actual: <%v>", err)
+		t.Fatalf("MarkVolumeAsAttached failed. Expected: <no error> Actual: <%v>", err)
 	}
 
 	verifyVolumeExistsAsw(t, generatedVolumeName, true /* shouldExist */, asw)
@@ -141,14 +189,12 @@ func Test_AddPodToVolume_Positive_ExistingVolumeNewNode(t *testing.T) {
 			},
 		},
 	}
-
 	volumeSpec := &volume.Spec{Volume: &pod.Spec.Volumes[0]}
-	volumeName, err := volumehelper.GetUniqueVolumeNameFromSpec(
-		plugin, volumeSpec)
+	generatedVolumeName, err := volumehelper.GetUniqueVolumeNameFromSpec(plugin, volumeSpec)
 
-	generatedVolumeName, err := asw.AddVolume(volumeSpec, devicePath)
+	err = asw.MarkVolumeAsAttached(emptyVolumeName, volumeSpec, "" /* nodeName */, devicePath)
 	if err != nil {
-		t.Fatalf("AddVolume failed. Expected: <no error> Actual: <%v>", err)
+		t.Fatalf("MarkVolumeAsAttached failed. Expected: <no error> Actual: <%v>", err)
 	}
 	podName := volumehelper.GetUniquePodName(pod)
 
@@ -159,7 +205,7 @@ func Test_AddPodToVolume_Positive_ExistingVolumeNewNode(t *testing.T) {
 
 	// Act
 	err = asw.AddPodToVolume(
-		podName, pod.UID, volumeName, mounter, volumeSpec.Name(), "" /* volumeGidValue */)
+		podName, pod.UID, generatedVolumeName, mounter, volumeSpec.Name(), "" /* volumeGidValue */)
 
 	// Assert
 	if err != nil {
@@ -202,12 +248,12 @@ func Test_AddPodToVolume_Positive_ExistingVolumeExistingNode(t *testing.T) {
 	}
 
 	volumeSpec := &volume.Spec{Volume: &pod.Spec.Volumes[0]}
-	volumeName, err := volumehelper.GetUniqueVolumeNameFromSpec(
+	generatedVolumeName, err := volumehelper.GetUniqueVolumeNameFromSpec(
 		plugin, volumeSpec)
 
-	generatedVolumeName, err := asw.AddVolume(volumeSpec, devicePath)
+	err = asw.MarkVolumeAsAttached(emptyVolumeName, volumeSpec, "" /* nodeName */, devicePath)
 	if err != nil {
-		t.Fatalf("AddVolume failed. Expected: <no error> Actual: <%v>", err)
+		t.Fatalf("MarkVolumeAsAttached failed. Expected: <no error> Actual: <%v>", err)
 	}
 	podName := volumehelper.GetUniquePodName(pod)
 
@@ -217,14 +263,14 @@ func Test_AddPodToVolume_Positive_ExistingVolumeExistingNode(t *testing.T) {
 	}
 
 	err = asw.AddPodToVolume(
-		podName, pod.UID, volumeName, mounter, volumeSpec.Name(), "" /* volumeGidValue */)
+		podName, pod.UID, generatedVolumeName, mounter, volumeSpec.Name(), "" /* volumeGidValue */)
 	if err != nil {
 		t.Fatalf("AddPodToVolume failed. Expected: <no error> Actual: <%v>", err)
 	}
 
 	// Act
 	err = asw.AddPodToVolume(
-		podName, pod.UID, volumeName, mounter, volumeSpec.Name(), "" /* volumeGidValue */)
+		podName, pod.UID, generatedVolumeName, mounter, volumeSpec.Name(), "" /* volumeGidValue */)
 
 	// Assert
 	if err != nil {
@@ -301,13 +347,13 @@ func Test_AddPodToVolume_Negative_VolumeDoesntExist(t *testing.T) {
 		asw)
 }
 
-// Calls AddVolume() once to add volume
+// Calls MarkVolumeAsAttached() once to add volume
 // Calls MarkDeviceAsMounted() to mark volume as globally mounted.
 // Verifies newly added volume exists in GetUnmountedVolumes()
 // Verifies newly added volume exists in GetGloballyMountedVolumes()
 func Test_MarkDeviceAsMounted_Positive_NewVolume(t *testing.T) {
 	// Arrange
-	volumePluginMgr, _ := volumetesting.GetTestVolumePluginMgr(t)
+	volumePluginMgr, plugin := volumetesting.GetTestVolumePluginMgr(t)
 	asw := NewActualStateOfWorld("mynode" /* nodeName */, volumePluginMgr)
 	pod := &api.Pod{
 		ObjectMeta: api.ObjectMeta{
@@ -329,9 +375,11 @@ func Test_MarkDeviceAsMounted_Positive_NewVolume(t *testing.T) {
 	}
 	volumeSpec := &volume.Spec{Volume: &pod.Spec.Volumes[0]}
 	devicePath := "fake/device/path"
-	generatedVolumeName, err := asw.AddVolume(volumeSpec, devicePath)
+	generatedVolumeName, err := volumehelper.GetUniqueVolumeNameFromSpec(plugin, volumeSpec)
+
+	err = asw.MarkVolumeAsAttached(emptyVolumeName, volumeSpec, "" /* nodeName */, devicePath)
 	if err != nil {
-		t.Fatalf("AddVolume failed. Expected: <no error> Actual: <%v>", err)
+		t.Fatalf("MarkVolumeAsAttached failed. Expected: <no error> Actual: <%v>", err)
 	}
 
 	// Act

pkg/kubelet/volumemanager/cache/desired_state_of_world.go

@@ -183,7 +183,15 @@ func (dsw *desiredStateOfWorld) AddPodToVolume(
 			err)
 	}
 
-	volumeName, err :=
+	var volumeName api.UniqueVolumeName
+
+	// The unique volume name used depends on whether the volume is attachable
+	// or not.
+	attachable := dsw.isAttachableVolume(volumeSpec)
+	if attachable {
+		// For attachable volumes, use the unique volume name as reported by
+		// the plugin.
+		volumeName, err =
 			volumehelper.GetUniqueVolumeNameFromSpec(volumePlugin, volumeSpec)
 		if err != nil {
 			return "", fmt.Errorf(
@@ -192,13 +200,18 @@ func (dsw *desiredStateOfWorld) AddPodToVolume(
 				volumePlugin.GetPluginName(),
 				err)
 		}
+	} else {
+		// For non-attachable volumes, generate a unique name based on the pod
+		// namespace and name and the name of the volume within the pod.
+		volumeName = volumehelper.GetUniqueVolumeNameForNonAttachableVolume(podName, volumePlugin, outerVolumeSpecName)
+	}
 
 	volumeObj, volumeExists := dsw.volumesToMount[volumeName]
 	if !volumeExists {
 		volumeObj = volumeToMount{
 			volumeName:         volumeName,
 			podsToMount:        make(map[types.UniquePodName]podToMount),
-			pluginIsAttachable: dsw.isAttachableVolume(volumeSpec),
+			pluginIsAttachable: attachable,
 			volumeGidValue:     volumeGidValue,
 			reportedInUse:      false,
 		}

pkg/volume/git_repo/git_repo.go

@@ -61,7 +61,7 @@ func (plugin *gitRepoPlugin) GetPluginName() string {
 func (plugin *gitRepoPlugin) GetVolumeName(spec *volume.Spec) (string, error) {
 	volumeSource, _ := getVolumeSource(spec)
 	if volumeSource == nil {
-		return "", fmt.Errorf("Spec does not reference a GCE volume type")
+		return "", fmt.Errorf("Spec does not reference a Git repo volume type")
 	}
 
 	return fmt.Sprintf(

pkg/volume/util/operationexecutor/operation_executor.go

@@ -15,8 +15,9 @@ limitations under the License.
 */
 
 // Package operationexecutor implements interfaces that enable execution of
-// attach, detach, mount, and unmount operations with a nestedpendingoperations
-// so that more than one operation is never triggered on the same volume.
+// attach, detach, mount, and unmount operations with a
+// nestedpendingoperations so that more than one operation is never triggered
+// on the same volume for the same pod.
 package operationexecutor
 
 import (
@@ -131,8 +132,14 @@ type ActualStateOfWorldMounterUpdater interface {
 // ActualStateOfWorldAttacherUpdater defines a set of operations updating the
 // actual state of the world cache after successful attach/detach/mount/unmount.
 type ActualStateOfWorldAttacherUpdater interface {
-	// Marks the specified volume as attached to the specified node
-	MarkVolumeAsAttached(volumeSpec *volume.Spec, nodeName string, devicePath string) error
+	// Marks the specified volume as attached to the specified node.  If the
+	// volume name is supplied, that volume name will be used.  If not, the
+	// volume name is computed using the result from querying the plugin.
+	//
+	// TODO: in the future, we should be able to remove the volumeName
+	// argument to this method -- since it is used only for attachable
+	// volumes.  See issue 29695.
+	MarkVolumeAsAttached(volumeName api.UniqueVolumeName, volumeSpec *volume.Spec, nodeName, devicePath string) error
 
 	// Marks the specified volume as detached from the specified node
 	MarkVolumeAsDetached(volumeName api.UniqueVolumeName, nodeName string)
@@ -370,6 +377,7 @@ func (oe *operationExecutor) MountVolume(
 	}
 
 	podName := volumetypes.UniquePodName("")
+	// TODO: remove this -- not necessary
 	if !volumeToMount.PluginIsAttachable {
 		// Non-attachable volume plugins can execute mount for multiple pods
 		// referencing the same volume in parallel
@@ -473,7 +481,7 @@ func (oe *operationExecutor) generateAttachVolumeFunc(
 
 		// Update actual state of world
 		addVolumeNodeErr := actualStateOfWorld.MarkVolumeAsAttached(
-			volumeToAttach.VolumeSpec, volumeToAttach.NodeName, devicePath)
+			api.UniqueVolumeName(""), volumeToAttach.VolumeSpec, volumeToAttach.NodeName, devicePath)
 		if addVolumeNodeErr != nil {
 			// On failure, return error. Caller will log and retry.
 			return fmt.Errorf(
@@ -931,12 +939,13 @@ func (oe *operationExecutor) generateVerifyControllerAttachedVolumeFunc(
 			// If the volume does not implement the attacher interface, it is
 			// assumed to be attached and the the actual state of the world is
 			// updated accordingly.
+
 			addVolumeNodeErr := actualStateOfWorld.MarkVolumeAsAttached(
-				volumeToMount.VolumeSpec, nodeName, volumeToMount.DevicePath)
+				volumeToMount.VolumeName, volumeToMount.VolumeSpec, nodeName, "" /* devicePath */)
 			if addVolumeNodeErr != nil {
 				// On failure, return error. Caller will log and retry.
 				return fmt.Errorf(
-					"VerifyControllerAttachedVolume.MarkVolumeAsAttached failed for volume %q (spec.Name: %q) pod %q (UID: %q) with: %v.",
+					"VerifyControllerAttachedVolume.MarkVolumeAsAttachedByUniqueVolumeName failed for volume %q (spec.Name: %q) pod %q (UID: %q) with: %v.",
 					volumeToMount.VolumeName,
 					volumeToMount.VolumeSpec.Name(),
 					volumeToMount.PodName,
@@ -987,7 +996,7 @@ func (oe *operationExecutor) generateVerifyControllerAttachedVolumeFunc(
 		for _, attachedVolume := range node.Status.VolumesAttached {
 			if attachedVolume.Name == volumeToMount.VolumeName {
 				addVolumeNodeErr := actualStateOfWorld.MarkVolumeAsAttached(
-					volumeToMount.VolumeSpec, nodeName, attachedVolume.DevicePath)
+					api.UniqueVolumeName(""), volumeToMount.VolumeSpec, nodeName, attachedVolume.DevicePath)
 				glog.Infof("Controller successfully attached volume %q (spec.Name: %q) pod %q (UID: %q) devicePath: %q",
 					volumeToMount.VolumeName,
 					volumeToMount.VolumeSpec.Name(),

pkg/volume/util/volumehelper/volumehelper.go

@@ -52,6 +52,12 @@ func GetUniqueVolumeName(pluginName, volumeName string) api.UniqueVolumeName {
 	return api.UniqueVolumeName(fmt.Sprintf("%s/%s", pluginName, volumeName))
 }
 
+// GetUniqueVolumeNameForNonAttachableVolume returns the unique volume name
+// for a non-attachable volume.
+func GetUniqueVolumeNameForNonAttachableVolume(podName types.UniquePodName, volumePlugin volume.VolumePlugin, podSpecName string) api.UniqueVolumeName {
+	return api.UniqueVolumeName(fmt.Sprintf("%s/%v-%s", volumePlugin.GetPluginName(), podName, podSpecName))
+}
+
 // GetUniqueVolumeNameFromSpec uses the given VolumePlugin to generate a unique
 // name representing the volume defined in the specified volume spec.
 // This returned name can be used to uniquely reference the actual backing