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MySQL 8.4 Reference Manual
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Info (Zip) - 4.0Mb 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.