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     <h4 class="title">
      <a name="group-replication-online-upgrade-considerations">
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      20.8.3.1 Online Upgrade Considerations
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  <p>
   When upgrading an online group you should consider the following
        points:
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      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.
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     <p>
      When a member is stopped, the
      <a class="link" href="server-system-variables.html#sysvar_super_read_only">
       <code class="literal">
        super_read_only
       </code>
      </a>
      variable is
            set to on automatically, but this change is not persisted.
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