Comment 2 for bug 1806760

hit this, the controller upgrade was failing stating one of the units was in state "RECOVERING".

To workaround this issue, check the logs of the units, finding the unit stating that Mongodb is too far behind to re-sync.

Then follow the steps on the mongodb docs to re-sync the DB.

https://docs.mongodb.com/manual/tutorial/resync-replica-set-member/