jixuan1989 opened a new pull request #830: [IOTDB-506]upgrade the protocol to v2 to reject clients or servers that version < 0.10 URL: https://github.com/apache/incubator-iotdb/pull/830 - If users use client/jdbc/session that version <0.10 to connect IoTDB server 0.10, unfriendly exception will be thrown. - If users use client/jdbc/session that version = 0.10 to connect IoTDB server that version <0.10, unfriendly exception will also be thrown. So, I upgrade the protocol to V2 while it is V1 in 0.9 and no such field in 0.8. Then, if we use client 0.9 to connect IoTDB 0.10, ``` IoTDB> Can not establish connection with jdbc:iotdb://127.0.0.1:6667/. Host is 127.0.0.1, port is 6667. ``` (we have no method to change the output of 0.9 client unless we release a new version of 0.9.*). if we use client 0.10 to connect IoTDB 0.9, ``` IoTDB> Can not establish connection with jdbc:iotdb://127.0.0.1:6667/ : You may try to connect an old version IoTDB instance using a client with new version: Required field 'client_protocol' was not present! Struct: TSOpenSessionReq(client_protocol:null, username:root, password:root). Host is 127.0.0.1, port is 6667. ```
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