Change:
"strings" "time" <ins> "k8s.io/api/core/v1" </ins> "k8s.io/apimachinery/pkg/api/resource" "k8s.io/apimachinery/pkg/types" <ins> "k8s.io/kubernetes/pkg/cloudprovider" kubeletapis "k8s.io/kubernetes/pkg/kubelet/apis" </ins> k8s_volume "k8s.io/kubernetes/pkg/volume" volumeutil "k8s.io/kubernetes/pkg/volume/util"

Discussion:
Resizing a persistent volume is partially broken on openstack (cinder) with k8s v1.11.1. Partially in the sense that static resizing (requiring a pod restart) works, but the newly introduced online resizing (not requiring a pod restart) fails. Upon resizing a pvc it remains in the Resizing condition forever (see the warning event) until I delete the pod that has this pvc mounted: After pod deletion it notifies me (correctly) that it's now waiting for the pod to come up to finish resizing: So far the warning event does not break the ExpandPersistentVolumes feature, as this one anyhow requires a pod restart. However it breaks the newly introduced ExpandInUsePersistentVolumes feature (alpha with k8s v1.11; doesn't require a pod restart for resizing to finish), as the pvc will remain in "Resizing" condition forever (or until the pod is restarted but this defeats the purpose of ExpandInUsePersistentVolumes). I'm not sure whether this is fully related but upon digging around I found and a consecutive fix with which was merged on Jan 23. However a few days later this fix seems to be (probably accidentally) overwritten with this commit: /kind bug /sig storage /sig openstack
/assign
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It is already fixed. So I will close it.
/close
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I am trying cinder online pvc resizing on kubernetes1.12.2. I noticed this kubernetes version has include your fix, but I still failed to resize pvc online.

The error log has no change: Warning VolumeResizeFailed 45s (x2 over 66s) volumeexpand Error expanding volume "default/myclaim-expend" of plugin : volume status is not available The error log is reported below code line "volume.Status != volumeAvailableStatus" // ExpandVolume expands the size of specific cinder volume (in GiB) func (os *OpenStack) ExpandVolume(volumeID string, oldSize resource.Quantity, newSize resource.Quantity) (resource.Quantity, error) { volume, err := os.getVolume(volumeID) if err != nil { return oldSize, err } if volume.Status != volumeAvailableStatus { // cinder volume can not be expanded if its status is not available return oldSize, fmt.Errorf("volume status is not available") } One point confused me, once cinder volume is used by pod, it's status is "in-use", how the online pvc resizing pass the code check "volume.Status != volumeAvailableStatus"? There's where the online pvc resizing fails.
It looks like Cinder can not support online volume expansion - which is what is happening here. Even if online expansion is enabled, I think to actually perform resizing of Cinder volumes - you must bring the pod down.