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MySQL 8.0 Reference Manual
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18.7.2.1 Online Upgrade Considerations

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.

  • When MySQL 5.7.22 or MySQL 8.0.11 tries to join a group running MySQL 5.7.21 or lower it fails to join the group because MySQL 5.7.21 does not send its value of lower_case_table_names.