MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6 Resetting Multi-Source Replicas

The RESET SLAVE statement can be used to reset a multi-source replica. By default, if you use the RESET SLAVE statement on a multi-source replica all channels are reset. Optionally, use the FOR CHANNEL channel clause to reset only a specific channel.

For GTID-based replication, note that RESET SLAVE has no effect on the replica's GTID execution history. If you want to clear this, issue RESET MASTER on the replica.

RESET SLAVE makes the replica forget its replication position, and clears the relay log, but it does not change any replication connection parameters, such as the source's host name. If you want to remove these for a channel, issue RESET SLAVE ALL.

For the full syntax of the RESET SLAVE command and other available options, see Section, “RESET SLAVE Statement”.