Xinyu Tan created IOTDB-3104:
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Summary: Add Consensus Module StateMachine Event API
Key: IOTDB-3104
URL: https://issues.apache.org/jira/browse/IOTDB-3104
Project: Apache IoTDB
Issue Type: Wish
Reporter: Xinyu Tan
Assignee: Xinyu Tan
We can register some event apis for statemachine to make the statemachine
handle upper-level changes specifically.
Currently we will support two api:
* notifyLeaderChanged：Notify the \{@link IStateMachine} that a new leader has
been elected. Note that the new leader can possibly be this server.
* notifyConfigurationChanged：Notify the \{@link IStateMachine} a configuration
change. This method will be invoked when a newConfiguration is processed.
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