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Fix race when two provisioner create two PVs for a single claim.

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This commit is contained in:
Jan Safranek 2016-11-03 16:58:25 +01:00
parent 18de83c641
commit 2224e80dd7
2 changed files with 60 additions and 0 deletions
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43
pkg/controller/volume/persistentvolume/delete_test.go
View File

@ -148,6 +148,49 @@ func TestDeleteSync(t *testing.T) {
return testSyncVolume(ctrl, reactor, test)
},
},
{
// delete success - two PVs are provisioned for a single claim.
// One of the PVs is deleted.
"8-11 - two PVs provisioned for a single claim",
[]*api.PersistentVolume{
newVolume("volume8-11-1", "1Gi", "uid8-11", "claim8-11", api.VolumeBound, api.PersistentVolumeReclaimDelete, annDynamicallyProvisioned),
newVolume("volume8-11-2", "1Gi", "uid8-11", "claim8-11", api.VolumeBound, api.PersistentVolumeReclaimDelete, annDynamicallyProvisioned),
},
[]*api.PersistentVolume{
newVolume("volume8-11-2", "1Gi", "uid8-11", "claim8-11", api.VolumeBound, api.PersistentVolumeReclaimDelete, annDynamicallyProvisioned),
},
// the claim is bound to volume8-11-2 -> volume8-11-1 has lost the race and will be deleted
newClaimArray("claim8-11", "uid8-11", "10Gi", "volume8-11-2", api.ClaimBound),
newClaimArray("claim8-11", "uid8-11", "10Gi", "volume8-11-2", api.ClaimBound),
noevents, noerrors,
// Inject deleter into the controller and call syncVolume. The
// deleter simulates one delete() call that succeeds.
wrapTestWithReclaimCalls(operationDelete, []error{nil}, testSyncVolume),
},
{
// delete success - two PVs are externally provisioned for a single
// claim. One of the PVs is marked as Released to be deleted by the
// external provisioner.
"8-12 - two PVs externally provisioned for a single claim",
[]*api.PersistentVolume{
newVolume("volume8-12-1", "1Gi", "uid8-12", "claim8-12", api.VolumeBound, api.PersistentVolumeReclaimDelete, annDynamicallyProvisioned),
newVolume("volume8-12-2", "1Gi", "uid8-12", "claim8-12", api.VolumeBound, api.PersistentVolumeReclaimDelete, annDynamicallyProvisioned),
},
[]*api.PersistentVolume{
newVolume("volume8-12-1", "1Gi", "uid8-12", "claim8-12", api.VolumeReleased, api.PersistentVolumeReclaimDelete, annDynamicallyProvisioned),
newVolume("volume8-12-2", "1Gi", "uid8-12", "claim8-12", api.VolumeBound, api.PersistentVolumeReclaimDelete, annDynamicallyProvisioned),
},
// the claim is bound to volume8-12-2 -> volume8-12-1 has lost the race and will be "Released"
newClaimArray("claim8-12", "uid8-12", "10Gi", "volume8-12-2", api.ClaimBound),
newClaimArray("claim8-12", "uid8-12", "10Gi", "volume8-12-2", api.ClaimBound),
noevents, noerrors,
func(ctrl *PersistentVolumeController, reactor *volumeReactor, test controllerTest) error {
// Inject external deleter annotation
test.initialVolumes[0].Annotations[annDynamicallyProvisioned] = "external.io/test"
test.expectedVolumes[0].Annotations[annDynamicallyProvisioned] = "external.io/test"
return testSyncVolume(ctrl, reactor, test)
},
},
}
runSyncTests(t, tests, []*storage.StorageClass{})
}

17
pkg/controller/volume/persistentvolume/pv_controller.go
View File

@ -492,6 +492,17 @@ func (ctrl *PersistentVolumeController) syncVolume(volume *api.PersistentVolume)
// This volume was dynamically provisioned for this claim. The
// claim got bound elsewhere, and thus this volume is not
// needed. Delete it.
// Mark the volume as Released for external deleters and to let
// the user know. Don't overwrite existing Failed status!
if volume.Status.Phase != api.VolumeReleased && volume.Status.Phase != api.VolumeFailed {
// Also, log this only once:
glog.V(2).Infof("dynamically volume %q is released and it will be deleted", volume.Name)
if volume, err = ctrl.updateVolumePhase(volume, api.VolumeReleased, ""); err != nil {
// Nothing was saved; we will fall back into the same condition
// in the next call to this method
return err
}
}
if err = ctrl.reclaimVolume(volume); err != nil {
// Deletion failed, we will fall back into the same condition
// in the next call to this method
@ -1131,6 +1142,12 @@ func (ctrl *PersistentVolumeController) isVolumeReleased(volume *api.PersistentV
}
if claim != nil && claim.UID == volume.Spec.ClaimRef.UID {
// the claim still exists and has the right UID
if len(claim.Spec.VolumeName) > 0 && claim.Spec.VolumeName != volume.Name {
// the claim is bound to another PV, this PV *is* released
return true, nil
}
glog.V(4).Infof("isVolumeReleased[%s]: ClaimRef is still valid, volume is not released", volume.Name)
return false, nil
}