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Pre-vote

In the context of Raft, it is a very common for leaders to hit network partition. We implemented the progress timeout in KIP-595, so that when a majority of voters are not fetching from the leader, the current leader will start election to reach out to other followers to re-establish the leadership or learn about the new leader. However, if the zombie leader could not connect to the quorum long enough, it will bump its epoch repeatedly such that when it eventually reconnects to the quorum, it will trigger another election and win it unexpectedly. This is called "disruptive server" the Raft literature.

Public Interfaces

Briefly list any new interfaces that will be introduced as part of this proposal or any existing interfaces that will be removed or changed. The purpose of this section is to concisely call out the public contract that will come along with this feature.

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