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We support rolling upgrades from Zen1 by keeping the master as a Zen1 node until there are no more Zen1 nodes in the cluster, using the following principles: - Zen1 nodes will never vote for Zen2 nodes - Zen2 nodes will, while not bootstrapped, vote for Zen1 nodes - Zen2 nodes that were previously part of a mixed cluster will automatically (and unsafely) bootstrap themselves when the last Zen1 node leaves.