Data processing method and system

A data processing method, wherein the method is applied to a data processing system, the data processing system comprises a first client and a replication group, local maximum term identifiers in more than half of servers in the replication group are a first identifier, the first identifier indicates that a consensus that a first server in the replication group serves as a first role is reached in the replication group, and the method comprises:

• broadcasting, by the first client, a first write command, wherein the first write command comprises the first identifier, to-be-written first content of a first object, and a to-be-written first version number;
• when a local maximum term identifier is the first identifier and a local maximum version number corresponding to the first object is less than the first version number, writing, by a server in the replication group, the first content and the first version number locally, and sending first information to the first client, wherein the first information indicates agreement to the first write command;
• and
• when receiving the first information sent by more than half of the servers in the replication group, comprising the first server, broadcasting, by the first client, a commit command, wherein the commit command indicates to update a status of the first content corresponding to the first version number to a committed state.