mysql: Change Replication Topology A-＞B,C to A-＞B-＞C (Doc ID 1444892.1)

Change Replication Topology A->B,C to A->B->C (Doc ID 1444892.1)

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In this Document APPLIES TO: MySQL Server - Version 5.5 and later Information in this document applies to any platform. GOAL Change from master A replicating to slaves B and C, to master A replicating to B which replicates to C.   SOLUTION 1. Check that B is properly set up as a master: the binary log is enabled, log_slave_updates is set, and the server has a unique server-id. 2. Stop the replication threads on B and C. STOP SLAVE; 3. Check if the slave has any open temporary tables: SHOW STATUS LIKE 'Slave_open_temp_tables';   If the number of temporary tables is non-zero, then start and stop the slave again until it is 0. 4. Examine Relay_master_log_file and Exec_master_log_pos from B and C. SHOW SLAVE STATUS\G 5. One of the servers will be farther behind. Advance it to match the other.  START SLAVE UNTIL master_log_file='X', master_log_pos=Y; Fill in X and Y with Relay_master_log_file and Exec_master_log_pos from ahead server.   6. Use SHOW SLAVE STATUS\G until you see that it has reached the specified position and stopped. 7. Now B and C should be identical, having stopped at the same position. 8. Get the binlog position from B. SHOW MASTER STATUS; 9. Change C to the new master.  CHANGE MASTER TO master_host='B', master_log_file=X', master_log_pos=Y;  Fill in X and Y with the values from step 7 10. Start replication on B and C (order doesn't matter). START SLAVE; REFERENCES NOTE:1962618.1 - Change Replication Topology A->B->C to A->B,C https://dev.mysql.com/doc/en/replication-features-temptables.html