Error
Error Code:
3970
MySQL Error 3970: Empty Recovery Channel Username
Description
This error indicates that the `START GROUP_REPLICATION` command failed because the username required for the recovery channel was not provided or was an empty string. Group Replication requires a dedicated user for internal communication and data synchronization during state recovery among members.
Error Message
The START GROUP_REPLICATION command failed since the username provided for recovery channel is empty.
Known Causes
3 known causesMissing USER in START GROUP_REPLICATION
The `USER` clause for the recovery channel was omitted or explicitly set to an empty string in the `START GROUP_REPLICATION` command.
Incorrect Configuration Variable
The `group_replication_recovery_user` system variable was either not configured or was set to an empty value in the MySQL configuration file (`my.cnf` or `my.ini`) or session.
Programmatic API Call Error
An application or script initiating Group Replication via an API provided an empty or null username for the recovery channel.
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