This change adds a function to remove the annotations associated with
marking a node for deletion. It also adds logic to unmark a node in the
event that an error is returned after the node has been annotated but
before it has been removed. In the case where a node cannot be removed
(eg due to minimum size), the node is unmarked before we return from the
error condition.
When getting Replicas() the local struct in the scalable resource might be stale. To mitigate possible side effects, we want always get a fresh replicas.
This is one in a series of PR to mitigate kubernetes#3104
The autoscaler expects provider implementations nodeGroups to implement the Nodes() function to return the number of instances belonging to the group regardless of they have become a kubernetes node or not.
This information is then used for instance to realise about unregistered nodes bf3a9fb52e/cluster-autoscaler/clusterstate/clusterstate.go (L307-L311)
Michael McCune
Enxebre
Andrew McDermott