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When adding a new etcd member the etcd cluster can enter a state of vote, where any new members added at the exact same time will fail with an error right away. Implement exponential backoff retry around the MemberAdd call. This solves a kubeadm problem when concurrently joining control-plane nodes with stacked etcd members. From experiment, a few retries with milliseconds apart are sufficient to achieve the concurrent join of a 3xCP cluster. Apply the same backoff to MemberRemove in case the concurrent removal of members fails for similar reasons.