Each Raft election starts a new blank. A node votes for at most one candidate per term, so at most one blank can be elected in it.

Answer

Each Raft election starts a new term. A node votes for at most one candidate per term, so at most one leader can be elected in it.

Why

Messages carry the term, so a node that sees a higher term steps down. That is how an old leader coming back from a partition finds out it was replaced.

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