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New Feature: ======== This feature adds a safe replacement to the MASTER_USE_GTID=Current_Pos option for CHANGE MASTER TO as MASTER_DEMOTE_TO_SLAVE=<bool>. The use case of Current_Pos is to transition a master to become a slave; however, can break replication state if the slave executes local transactions due to actively updating gtid_current_pos with gtid_binlog_pos and gtid_slave_pos. MASTER_DEMOTE_TO_SLAVE changes this use case by forcing users to set Using_Gtid=Slave_Pos and merging gtid_binlog_pos into gtid_slave_pos once at CHANGE MASTER TO time. Note that if gtid_slave_pos is more recent than gtid_binlog_pos (as in the case of chain replication), the replication state should be preserved. Additionally, deprecate the `Current_Pos` option of MASTER_USE_GTID to suggest the safe alternative option MASTER_DEMOTE_TO_SLAVE=TRUE. Reviewed By: ============ Andrei Elkin <andrei.elkin@mariadb.com> |
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