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In 3., the leader will wait for its current epoch to commit by waiting for the LeaderChangeMessage to commit. This is required to guarantee that the two competing voters setsets, the one from a previous leader and the one from the current leader, only differ by at most one voter. Waiting for the current epoch to commit means that there cannot be some other competing voters set from another leader that can later override this leader's new voters set. See bug in single-server membership changes for more details on this.

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