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Replication topologies, whether master-slave or group replication setups, may be composed of servers using different MySQL versions.
In MySQL 8.0.14, each transaction’s immediate and original server versions are now visible in the binary log as session variables. These two new variables, fully managed by the replication infrastructure, are used to support cross-version replication by transmitting the MySQL server release numbers associated with each transaction through the replication topology:
- original_server_version stores the MySQL Server release number of the server where a transaction was originally committed (for example, 80014 for a MySQL 8.0.14 server instance).
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