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1. A client sends a request to the leader's ClientServer;
2. ClientServer parses the request and lets Coordinator handle it;
3. Coordinator routes the request with the help of metaMember;
4. Finding out that the node should process the request, Coordinator MetaMember forwards the request to its DataClusterServer;
5. DataClusterServer finds the associated DataMember that should process it;
6. DataMember creates a log for the request and appends it to its RaftLogManager;
7. DataMember sends the log to other nodes in its DataGroup;
8. After sending to enough replicas, DataMember commit the log to its RaftLogManager;
9. RaftLogManager then applies the log to the underlying IoTDB;
10. The result is returned to the client.

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