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https://dev.mysql.com/doc/refman/8.0/en/group-replication-frequently-asked-questions.html
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 with 9 members causes the request to join to be refused. This limit has been identified from testing and ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-network-partitioning.html
The group needs to achieve consensus whenever a change that needs to be replicated happens. This is the case for regular transactions but is also required for group membership changes and some internal messaging that keeps the group consistent.
https://dev.mysql.com/doc/refman/8.0/en/group-replication-observability.html
There is a lot of automation built into the Group Replication plugin. Nonetheless, you might sometimes need to understand what is happening behind the scenes. This is where the instrumentation of Group Replication and Performance Schema becomes ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-online-upgrade-methods.html
Choose one of the following methods of upgrading a Group Replication group: Rolling In-Group Upgrade This method is supported provided that servers running a newer version are not generating workload to the group while there are still servers with ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-options.html
The next two sections contain information about MySQL server system and server status variables which are specific to the Group Replication plugin.
https://dev.mysql.com/doc/refman/8.0/en/group-replication-probes-and-statistics.html
The monitoring mechanism works by having each member deploying a set of probes to collect information about its work queues and throughput. It then propagates that information to the group periodically to share that data with the other members.
https://dev.mysql.com/doc/refman/8.0/en/group-replication-requirements.html
Infrastructure Server Instance Configuration Server instances that you want to use for Group Replication must satisfy the following requirements. Transactions are executed optimistically and then, at commit time, are checked for conflicts. If there ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-responses-failure-exit.html
The group_replication_exit_state_action system variable, which is available from MySQL 8.0.12 and MySQL 5.7.24, specifies what Group Replication does when the member leaves the group unintentionally due to an error or problem, and either fails to ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-responses-failure.html
Group Replication's failure detection mechanism is designed to identify group members that are no longer communicating with the group, and expel them as and when it seems likely that they have failed. Having a failure detection mechanism increases ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-secure-socket-layer-support-ssl.html
Secure sockets can be used for group communication connections between members of a group. The Group Replication system variable group_replication_ssl_mode is used to activate the use of SSL for group communication connections and specify the ...