dengziming opened a new pull request #9638:
URL: https://github.com/apache/kafka/pull/9638
The `KafkaRaftClient.onBecomeLeader` will invoke
`appendLeaderChangeMessage`, the call stack are:
```
1. appendLeaderChangeMessage
1.1 flushLeaderLog
1.1.1 updateLeaderEndOffsetAndTimestamp
1.1.2 log.flush()
```
so the `updateLeoAndTs ` is already invoked, and `updateLeoAndTs` should
only be invoked after leo change(or time change), since `log.flush()` will not
change leo(and ts), it's unnessary to invoke twice.
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