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https://dev.mysql.com/doc/refman/8.4/en/group-replication-details.html
This section introduces some of the services that Group Replication builds on.
https://dev.mysql.com/doc/refman/8.4/en/group-replication-operations.html
This section explains common operations for managing groups. ...
https://dev.mysql.com/doc/refman/8.4/en/replication-statements-group.html
This section provides information about the statements used for controlling group replication.
https://dev.mysql.com/doc/refman/8.4/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/8.4/en/group-replication-connection-security.html
MySQL 8.4 Group Replication can secure group communication connections between members by one of the following methods: Using its own implementation of the security protocols, including TLS/SSL and the use of an allowlist for incoming Group ...The ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-cloning.html
If you want to use remote cloning operations for distributed recovery in a group, you must set up existing members and joining members beforehand to support this function. If you do not want to use this function in a group, do not set it up, in ...
https://dev.mysql.com/doc/refman/8.4/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. In ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-view-changes.html
When Group Replication's distributed recovery process is carrying out state transfer from the binary log, to synchronize the joining member with the donor up to a specific point in time, the joining member and donor make use of GTIDs (see Section ...However, GTIDs only provide a means to realize which transactions the joining member is ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-multi-primary-mode.html
In multi-primary mode (group_replication_single_primary_mode=OFF) no member has a special role. Any member that is compatible with the other group members is set to read/write mode when joining the group, and can process write transactions, even if ...If a member stops accepting write transactions, for example, in the event of an unexpected server exit, clients connected to it can be redirected, or failed over, to any other member that is in read/write ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-responses-failure-exit.html
The group_replication_exit_state_action system variable specifies what Group Replication does when the member leaves the group unintentionally due to an error or problem, and either fails to auto-rejoin or does not try. Note that in the case of an ...In order of impact, the exit actions are as follows: If READ_ONLY is the exit action, the instance switches MySQL to super read only mode by setting the system variable super_read_only to ...