THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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During the shutdown, write the current broker epoch in the CleanShutdownFile.
During the start, the broker will try to read the broker epoch from the CleanShutdownFile. Then put this broker epoch in the broker registration request.
The controller will verify the broker epoch in the request with its registration record. If it is the same, it is a clean shutdown.
- if the broker shuts down before it receives the broker epoch, it will write -1.
Note, the CleanShutdownFile is removed after the log manager is initialized. It will be created and written when the log manager is shutting down.
Unclean recovery
As the new proposal allows the ISR to be empty, the leader election strategy has to be reviewed.
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