Error
Error Code:
4020
MySQL Error 4020: Replication GTID UUID Misconfiguration
Description
Error 4020 indicates a critical misconfiguration in MySQL Group Replication. It occurs when the `ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS` variable is set to a UUID value that is identical to the `group_replication_group_name`. This conflict prevents the proper assignment of GTIDs to anonymous transactions, hindering replication functionality.
Error Message
Replication '%s' is configured with ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS = <UUID> where the UUID value is equal to the group_replication_group_name
Known Causes
3 known causesManual Configuration Error
An administrator or script explicitly configured `ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS` with a UUID value that matches the `group_replication_group_name`.
Automated Deployment Issue
An automated script or tool incorrectly set the `ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS` value to be identical to the group's UUID during setup.
Copy-Paste Configuration Mistake
During manual setup or cloning, the `group_replication_group_name` UUID was inadvertently copied and used for `ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS`.
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