MySQL 8.4 Release Notes
20.8.3.1 在线升级注意事项
When upgrading an online group you should consider the following points:
-
Regardless of the way which you upgrade your group, it is important to disable any writes to group members until they are ready to rejoin the group.
-
When a member is stopped, the
super_read_only
variable is set to on automatically, but this change is not persisted.