[WIP]should we add releasedTimestamp for pv

[zhangxiaoyu-zidif]

background:
when we create PV dynamically by storageclass and released those PV. The remained PV should be cleaned periodically.

If we want automatically delete them by released order, we need a release timestamp in PV resource object.

[wongma7]

It is the kubernetes PV controller that Releases PVs https://github.com/kubernetes/kubernetes/blob/master/pkg/controller/volume/persistentvolume/pv_controller.go#L801.

To make sure I understand correctly: you want to leave PVs around with Retain reclaim policy and clean them up later with some kind of cron job? Why not give them Delete reclaim policy and let the provisioner delete them?

[zhangxiaoyu-zidif]

@wongma7 in fact, we want to keep them for re-use, but if those released PVs are not reused for a long time or under disk pressure, we need to delete them by cronjob or other ways.
I need much more considerations.

[zhangxiaoyu-zidif]

cc @jian-he

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