Error
Error Code:
4021
MySQL Error 4021: Replication UUID Conflicts with Group Name
Description
This error occurs when attempting to configure a replication source using the `CHANGE REPLICATION SOURCE TO ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS` statement. It indicates that the UUID you provided for this replication setting is identical to the `group_replication_group_name` of the current MySQL server instance, which is explicitly disallowed to prevent system conflicts.
Error Message
CHANGE REPLICATION SOURCE TO ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS = <UUID> cannot be executed because the UUID value is equal to the group_replication_group_name.
Known Causes
3 known causesIncorrect Replication UUID Assignment
The user or an automated process manually assigned a UUID for `ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS` that inadvertently matches the existing `group_replication_group_name` of the server.
Unaware of Existing Group Name
The user might be unaware that the server is already part of a Group Replication setup with a specific `group_replication_group_name`, leading to the UUID conflict during replication source configuration.
Scripting or Automation Error
An automated script or tool attempted to configure replication using a UUID that was dynamically generated or hardcoded to match the server's Group Replication name.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service