the concerns we focused on: How to modify the architecture to support hundreds of nodes in one IoTDB cluster? How to promote the concurrent write/read performance with multi-replicas in IoTDB cluster？ How to guarantee the linear ratio of read and write in IoTDB cluster? How to support joint query between time series data and relational data in IoTDB cluster? How to support federal cluster query across data centers, AZ and regions? We should evaluate the stability and performance based on current architecture and decide if choose an alternative one? Discussion the replacement of the current Raft protocol with Ratis to assure the stability and performance
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