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fix. raft follower will rollback itself when it misses a certain log #5905

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fix. raft follower will rollback itself when it misses a certain log #5905

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Commits on Jul 5, 2024

  1. fix. raft follower will rollback itself when it misses a certain log 

    if a leader fails to update its last_log_id_sent (maybe caused be
follower fail or network issue), it will then try to send some
duplicated logs in the next appendLog request.

```
                      commitId_: 99
                          |
                          v
local wal: |-------------------|
req.append_entries:        |----------------|
```

in this case, follower will do rollback even if the logs are the same.
    @UndefinedSy
    UndefinedSy committed Jul 5, 2024
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