Error
Error Code:
3191
MySQL Error 3191: Group Replication Full
Description
This error indicates that an attempt to add a new member to a MySQL Group Replication group failed because the group has reached its maximum allowed size. It occurs when the `START GROUP_REPLICATION` command is executed on a server trying to join a group that already contains the maximum number of members, typically 9 by default.
Error Message
The START GROUP_REPLICATION command failed since the group already has 9 members.
Known Causes
3 known causesGroup Size Limit Reached
The Group Replication cluster has reached its configured maximum number of active members, preventing any new instances from joining.
Incorrect Seed Configuration
The `group_replication_group_seeds` parameter might be configured to point to a group that is already full, leading to failed join attempts.
Excessive Instance Addition
An operation or script attempted to add more MySQL server instances to the group than its current maximum capacity allows.
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