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9edc98f8e9
For `removenode`, we make a removed node a non-voter early. There is no downside to it because the node is already dead. Moreover, it improves availability in some situations. For `decommission`, if we decommission a node when the number of nodes is even, we make it a non-voter early to improve availability. All majorities containing this node will remain majorities when we make this node a non-voter and remove it from the set because the required size of a majority decreases. We don't change `decommission` when the number of nodes is odd since this may reduce availability. Fixes #13959 Closes #14911 * github.com:scylladb/scylladb: raft: make a decommissioning node a non-voter early raft: topology_coordinator: implement step_down_as_nonvoter raft: make a removed node a non-voter early