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18.7.2 Group Replication Offline Upgrade
To perform an offline upgrade of a Group Replication group, you remove each member from the group, perform an upgrade of the member and then restart the group as usual. In a multi-primary group you can shutdown the members in any order. In a single-primary group, shutdown each secondary first and then finally the primary. See Section 18.7.3.2, “Upgrading a Group Replication Member” for how to remove members from a group and shutdown MySQL.
Once the group is offline, upgrade all of the members. See Section 2.11, “Upgrading MySQL” for how to perform an upgrade. When all members have been upgraded, restart the members.
If you upgrade all the members of a replication group when they
are offline and then restart the group, the members join using the
new release's Group Replication communication protocol version, so
that becomes the group's communication protocol version. If you
have a requirement to allow members at earlier releases to join,
you can use the
group_replication_set_communication_protocol()
UDF to downgrade the communication protocol version, specifying
the MySQL Server version of the prospective group member that has
the oldest installed server version.
Document created the 26/06/2006, last modified the 26/10/2018
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