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      20.8.3 Group Replication Online Upgrade
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      <a href="group-replication-online-upgrade-considerations.html">
       20.8.3.1 Online Upgrade Considerations
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       20.8.3.2 Upgrading a Group Replication Member
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       20.8.3.3 Group Replication Online Upgrade Methods
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       20.8.3.4 Group Replication Upgrade with mysqlbackup
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   When you have a group running which you want to upgrade but you
      need to keep the group online to serve your application, you need
      to consider your approach to the upgrade. This section describes
      the different elements involved in an online upgrade, and various
      methods of how to upgrade your group.
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