Ability to resize PVCs

[pbelgundi]

Description

Currently PVCs created for journal,ledger,index volumes in Bookkeeper cannot be resized and for lifetime of the Pravega deployment the PVCs will continue to be pf the same size

Importance

should-have

[pbelgundi]

In order to resize PVCs in a Pravega cluster managed by the operator, we need to:

• Make sure the underlying block storage provider supports volume resizing.
• Create the operator logic to identify when a user is attempting to resize a PVC.
• Wait until the PVC condition to changes to FileSystemResizePending
• Restart all affected pods for the PVC resizing to be applied (maybe sequentially to avoid downtime)
• Check that the PVC size has changed

Related links:
https://kubernetes.io/blog/2018/07/12/resizing-persistent-volumes-using-kubernetes/
kubernetes/kubernetes#68737

[pbelgundi]

Moved from pravega-operator: pravega/pravega-operator#101