kaijchen edited a comment on pull request #500:
URL: https://github.com/apache/ratis/pull/500#issuecomment-922227394
For a detailed example, in 3-node Raft group.
| Node | Role | Term | Log Index -> | 1 | 2 | 3 | 4 | 5 | 6 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| A | Leader | 1 | Log Term -> | 1 | 1 | 1 | 1 | 1 | |
| B | Candidate | 2 | Log Term -> | 1 | 1 | 1 | | | |
| C | Follower | 1 | Log Term -> | 1 | 1 | | | | |
1. It is possible for B to passed the PreVote stage and became a candidate,
`B {term = 2, voteFor = B}`
* The message is `RequestForVote {candidate = B, term = 2, lastLogTerm =
1, lastLogIndex = 3}`.
2. B -> A: RequestForVote
* **A rejects the vote request and steps down**, `A {term = 2, voteFor =
None}`.
3. B -> C: RequestForVote
* C accepts the vote request, `C {term = 2, voteFor = B}`.
4. B got quorum votes and became the new leader.
5. B begin to send AppendEntries requests to A and C.
The end result might look like this.
| Node | Role | Term | Log Index -> | 1 | 2 | 3 | 4 | 5 | 6 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| A | Follower | 2 | Log Term -> | 1 | 1 | 1 | 2 | | |
| B | Leader | 2 | Log Term -> | 1 | 1 | 1 | 2 | 2 | 2 |
| C | Follower | 2 | Log Term -> | 1 | 1 | 1 | 2 | 2 | |
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