[PVC Expand]A special case will case pvc updated, but not expand lv by lvm-node

[esimest]

Description

As https://github.com/openebs/lvm-localpv/blob/v0.8.x/design/lvm/images/resize_sequence_diagram.jpg show If happen:

1. step "Mark PVC As Filesystem resize required" Failed.
2. Skip NodeExpandVolume
3. run whole steps again

But when executing this process for the second time, it will happen:

1. ControllerExpandVolume return fsResizeRequired=nil because of https://github.com/openebs/lvm-localpv/blob/develop/pkg/driver/controller.go#L544
2. step "Mark PVC As Filesystem resize required" skipped, and run markPVCResizeFinished.(mark pvc update finished)
3. skip NodeExpandVolume

Conclusion

So In above case, it will happen pvc updated finsihed but lv didn't resize

Describe

lv can resize normally even if above case happen.

[dung-tien-nguyen]

Make sure that when you run the command lvs, lvm corresponds to the PV which is doing the resize error, has the status "-wi-ao----"

If the status is: "-wi-a-----" means that the pv is generated but not used by any container at all. This also results in resize failure (since kubelet doesn't trigger NodeExpandVolume event to lvm node )

[abhilashshetty04]

@esimest Thanks for reporting the issue. Can you please let us know how did you reproduce this?

[dsharma-dc]

Would be helpful to get some more clear details about the reproducing the problem so that we can look into it. Please share the user action details to help better. Also, as mentioned by @dung-tien-nguyen , the filesystem will not expand until the volume is published i.e. used by an application.

[avishnu]

Further investigation needed. Investigation scoped for v4.2.