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Wait for detach operation to complete

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When volume's status is 'detaching', controllermanager will detach
it again and return err. It is necessary to wait for detach
operation to complete within the alloted time.
This commit is contained in:
FengyunPan 2017-05-31 07:52:15 +08:00
parent 755d368c4a
commit 300f531389
3 changed files with 122 additions and 18 deletions
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1
pkg/volume/cinder/BUILD
View File

@ -35,6 +35,7 @@ go_library(
"//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
"//vendor/k8s.io/apimachinery/pkg/types:go_default_library",
"//vendor/k8s.io/apimachinery/pkg/util/sets:go_default_library",
"//vendor/k8s.io/apimachinery/pkg/util/wait:go_default_library",
],
)

78
pkg/volume/cinder/attacher.go
View File

@ -25,6 +25,7 @@ import (
"github.com/golang/glog"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/kubernetes/pkg/util/exec"
"k8s.io/kubernetes/pkg/util/mount"
"k8s.io/kubernetes/pkg/volume"
@ -41,7 +42,13 @@ var _ volume.Attacher = &cinderDiskAttacher{}
var _ volume.AttachableVolumePlugin = &cinderPlugin{}
const (
checkSleepDuration = time.Second
checkSleepDuration = 1 * time.Second
operationFinishInitDealy = 1 * time.Second
operationFinishFactor = 1.1
operationFinishSteps = 10
diskDetachInitDealy = 1 * time.Second
diskDetachFactor = 1.2
diskDetachSteps = 13
)
func (plugin *cinderPlugin) NewAttacher() (volume.Attacher, error) {
@ -267,6 +274,63 @@ func (plugin *cinderPlugin) NewDetacher() (volume.Detacher, error) {
}, nil
}
func (detacher *cinderDiskDetacher) waitOperationFinished(volumeID string) error {
backoff := wait.Backoff{
Duration: operationFinishInitDealy,
Factor: operationFinishFactor,
Steps: operationFinishSteps,
}
var volumeStatus string
err := wait.ExponentialBackoff(backoff, func() (bool, error) {
var pending bool
var err error
pending, volumeStatus, err = detacher.cinderProvider.OperationPending(volumeID)
if err == nil {
if pending == false {
return true, nil
} else {
return false, nil
}
} else {
return false, err
}
})
if err == wait.ErrWaitTimeout {
err = fmt.Errorf("Volume %q is %s, can't finish within the alloted time", volumeID, volumeStatus)
}
return err
}
func (detacher *cinderDiskDetacher) waitDiskDetached(instanceID, volumeID string) error {
backoff := wait.Backoff{
Duration: diskDetachInitDealy,
Factor: diskDetachFactor,
Steps: diskDetachSteps,
}
err := wait.ExponentialBackoff(backoff, func() (bool, error) {
attached, err := detacher.cinderProvider.DiskIsAttached(instanceID, volumeID)
if err == nil {
if attached == false {
return true, nil
} else {
return false, nil
}
} else {
return false, err
}
})
if err == wait.ErrWaitTimeout {
err = fmt.Errorf("Volume %q failed to detach within the alloted time", volumeID)
}
return err
}
func (detacher *cinderDiskDetacher) Detach(deviceMountPath string, nodeName types.NodeName) error {
volumeID := path.Base(deviceMountPath)
instances, res := detacher.cinderProvider.Instances()
@ -278,6 +342,10 @@ func (detacher *cinderDiskDetacher) Detach(deviceMountPath string, nodeName type
instanceID = instanceID[(ind + 1):]
}
if err := detacher.waitOperationFinished(volumeID); err != nil {
return err
}
attached, err := detacher.cinderProvider.DiskIsAttached(instanceID, volumeID)
if err != nil {
// Log error and continue with detach
@ -293,10 +361,14 @@ func (detacher *cinderDiskDetacher) Detach(deviceMountPath string, nodeName type
}
if err = detacher.cinderProvider.DetachDisk(instanceID, volumeID); err != nil {
glog.Errorf("Error detaching volume %q: %v", volumeID, err)
glog.Errorf("Error detaching volume %q from node %q: %v", volumeID, nodeName, err)
return err
}
glog.Infof("detached volume %q from instance %q", volumeID, instanceID)
if err = detacher.waitDiskDetached(instanceID, volumeID); err != nil {
glog.Errorf("Error waiting for volume %q to detach from node %q: %v", volumeID, nodeName, err)
return err
}
glog.Infof("detached volume %q from node %q", volumeID, nodeName)
return nil
}

61
pkg/volume/cinder/attacher_test.go
View File

@ -36,6 +36,8 @@ import (
const VolumeStatusPending = "pending"
const VolumeStatusDone = "done"
var VolumeIsNotAttached = true
func TestGetDeviceName_Volume(t *testing.T) {
plugin := newPlugin()
name := "my-cinder-volume"
@ -96,6 +98,7 @@ type testcase struct {
disksAreAttached disksAreAttachedCall
diskPath diskPathCall
t *testing.T
notAttached *bool
instanceID string
// Actual test to run
@ -118,6 +121,7 @@ func TestAttachDetach(t *testing.T) {
diskCheckError := errors.New("Fake DiskIsAttached error")
diskPathError := errors.New("Fake GetAttachmentDiskPath error")
disksCheckError := errors.New("Fake DisksAreAttached error")
operationFinishTimeout := errors.New("Fake waitOperationFinished error")
tests := []testcase{
// Successful Attach call
{
@ -247,10 +251,11 @@ func TestAttachDetach(t *testing.T) {
// Detach succeeds
{
name: "Detach_Positive",
instanceID: instanceID,
diskIsAttached: diskIsAttachedCall{instanceID, volumeID, true, nil},
detach: detachCall{instanceID, volumeID, nil},
name: "Detach_Positive",
instanceID: instanceID,
operationPending: operationPendingCall{volumeID, false, done, nil},
diskIsAttached: diskIsAttachedCall{instanceID, volumeID, true, nil},
detach: detachCall{instanceID, volumeID, nil},
test: func(testcase *testcase) (string, error) {
detacher := newDetacher(testcase)
return "", detacher.Detach(volumeID, nodeName)
@ -259,9 +264,10 @@ func TestAttachDetach(t *testing.T) {
// Disk is already detached
{
name: "Detach_Positive_AlreadyDetached",
instanceID: instanceID,
diskIsAttached: diskIsAttachedCall{instanceID, volumeID, false, nil},
name: "Detach_Positive_AlreadyDetached",
instanceID: instanceID,
operationPending: operationPendingCall{volumeID, false, done, nil},
diskIsAttached: diskIsAttachedCall{instanceID, volumeID, false, nil},
test: func(testcase *testcase) (string, error) {
detacher := newDetacher(testcase)
return "", detacher.Detach(volumeID, nodeName)
@ -270,10 +276,11 @@ func TestAttachDetach(t *testing.T) {
// Detach succeeds when DiskIsAttached fails
{
name: "Detach_Positive_CheckFails",
instanceID: instanceID,
diskIsAttached: diskIsAttachedCall{instanceID, volumeID, false, diskCheckError},
detach: detachCall{instanceID, volumeID, nil},
name: "Detach_Positive_CheckFails",
instanceID: instanceID,
operationPending: operationPendingCall{volumeID, false, done, nil},
diskIsAttached: diskIsAttachedCall{instanceID, volumeID, false, diskCheckError},
detach: detachCall{instanceID, volumeID, nil},
test: func(testcase *testcase) (string, error) {
detacher := newDetacher(testcase)
return "", detacher.Detach(volumeID, nodeName)
@ -282,20 +289,36 @@ func TestAttachDetach(t *testing.T) {
// Detach fails
{
name: "Detach_Negative",
instanceID: instanceID,
diskIsAttached: diskIsAttachedCall{instanceID, volumeID, false, diskCheckError},
detach: detachCall{instanceID, volumeID, detachError},
name: "Detach_Negative",
instanceID: instanceID,
operationPending: operationPendingCall{volumeID, false, done, nil},
diskIsAttached: diskIsAttachedCall{instanceID, volumeID, false, diskCheckError},
detach: detachCall{instanceID, volumeID, detachError},
test: func(testcase *testcase) (string, error) {
detacher := newDetacher(testcase)
return "", detacher.Detach(volumeID, nodeName)
},
expectedError: detachError,
},
// // Disk is detaching
{
name: "Detach_Is_Detaching",
instanceID: instanceID,
operationPending: operationPendingCall{volumeID, true, pending, operationFinishTimeout},
test: func(testcase *testcase) (string, error) {
detacher := newDetacher(testcase)
return "", detacher.Detach(volumeID, nodeName)
},
expectedError: operationFinishTimeout,
},
}
for _, testcase := range tests {
testcase.t = t
// set VolumeIsNotAttached to test detach case, attach case ignore it
VolumeIsNotAttached = false
testcase.notAttached = &VolumeIsNotAttached
result, err := testcase.test(&testcase)
if err != testcase.expectedError {
t.Errorf("%s failed: expected err=%q, got %q", testcase.name, testcase.expectedError, err)
@ -457,6 +480,8 @@ func (testcase *testcase) AttachDisk(instanceID, volumeID string) (string, error
glog.V(4).Infof("AttachDisk call: %s, %s, returning %q, %v", volumeID, instanceID, expected.retDeviceName, expected.ret)
VolumeIsNotAttached = false
testcase.notAttached = &VolumeIsNotAttached
return expected.retDeviceName, expected.ret
}
@ -482,6 +507,8 @@ func (testcase *testcase) DetachDisk(instanceID, volumeID string) error {
glog.V(4).Infof("DetachDisk call: %s, %s, returning %v", volumeID, instanceID, expected.ret)
VolumeIsNotAttached = true
testcase.notAttached = &VolumeIsNotAttached
return expected.ret
}
@ -500,6 +527,10 @@ func (testcase *testcase) OperationPending(diskName string) (bool, string, error
func (testcase *testcase) DiskIsAttached(instanceID, volumeID string) (bool, error) {
expected := &testcase.diskIsAttached
// If testcase call DetachDisk*, return false
if *testcase.notAttached == true {
return false, nil
}
if expected.volumeID == "" && expected.instanceID == "" {
// testcase.diskIsAttached looks uninitialized, test did not expect to