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https://dev.mysql.com/doc/refman/8.4/en/group-replication-compatibility-upgrade.html
Important Setting group_replication_allow_local_lower_version_join to ON does not make the new member compatible with the group; doing this allows it to join the group without any safeguards against incompatible behaviors by the existing members.
https://dev.mysql.com/doc/refman/8.4/en/group-replication-configuring-consistency-guarantees.html
This is important because consistency levels can have a negative impact on group performance they apply globally. Although the Transaction Synchronization Points section explains that conceptually there are two synchronization points from which you ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-configuring-online-group.html
Important For the coordinator to be able to configure group wide actions on a running group, all members must have the functions installed. You can configure an online group while Group Replication is running by using a set of functions, which rely ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-configuring-ssl-for-recovery.html
Important When using the MySQL communication stack (group_replication_communication_stack=MYSQL) AND secure connections between members (group_replication_ssl_mode is not set to DISABLED), the security settings discussed in this section are applied ...Whether the distributed recovery connection is made using the standard SQL client connection or a distributed recovery endpoint, to configure the connection securely, you can use Group Replication's dedicated distributed recovery SSL ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-deploying-locally.html
Important Group Replication is usually deployed on multiple hosts because this ensures that high-availability is provided. The most common way to deploy Group Replication is using multiple server instances, to provide high availability. It is also ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-distributed-recovery-connections.html
Important Distributed recovery can fail if a joining member cannot correctly identify the other members using the host name as defined by MySQL Server's hostname system variable. When a joining member connects to an online existing member for state ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-distributed-recovery-securing.html
Important When using the MySQL communication stack (group_replication_communication_stack=MYSQL) AND secure connections between members (group_replication_ssl_mode is not set to DISABLED), the security settings discussed in this section are applied ...When a member joins the group, distributed recovery is carried out using a combination of a remote cloning operation, if available and appropriate, and an asynchronous replication ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-frequently-asked-questions.html
Important The assigned value is used directly and is not affected by the skip_name_resolve system variable. What is the maximum number of MySQL servers in a group? A group can consist of maximum 9 servers. Attempting to add another server to a group ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-limitations.html
For a group in single-primary mode, only the primary accepts writes, so the READ COMMITTED isolation level is not important to Group Replication. Limit on Group Size Limits on Transaction Size The following known limitations exist for Group ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-message-compression.html
This is especially important within the context of large groups of servers under load. For messages sent between online group members, Group Replication enables message compression by default. Whether a specific message is compressed depends on the ...