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https://dev.mysql.com/doc/refman/8.0/en/group-replication-system-variables.html
This section lists the system variables that are specific to the Group Replication plugin. The name of each Group Replication system variable is prefixed with group_replication_. Note InnoDB Cluster uses Group Replication, but the default values of ...However, a joining member that already received the previous value of the system variable continues to use that ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-group-write-consensus.html
This section explains how to inspect and configure the maximum number of consensus instances at any time for a group. This maximum is referred to as the event horizon for a group, and is the maximum number of consensus instances that the group can ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-restarting-group.html
Group Replication is designed to ensure that the database service is continuously available, even if some of the servers that form the group are currently unable to participate in it due to planned maintenance or unplanned issues. As long as the ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-group-membership.html
In MySQL Group Replication, a set of servers forms a replication group. A group has a name, which takes the form of a UUID. The group is dynamic and servers can leave (either voluntarily or involuntarily) and join it at any time. If a server joins ...The list of online servers is referred to as a ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-configuring-online-group.html
You can configure an online group while Group Replication is running by using a set of functions, which rely on a group action coordinator. These functions are installed by the Group Replication plugin in version 8.0.13 and higher. This section ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-changing-group-mode.html
This section explains how to change the mode which a group is running in, either single or multi-primary. The functions used to change a group's mode can be run on any member. Changing to Single-Primary Mode Use the ...Members running MySQL 8.0.16 ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-fine-tuning-the-group-communication-thread.html
The group communication thread (GCT) runs in a loop while the Group Replication plugin is loaded. The GCT receives messages from the group and from the plugin, handles quorum and failure detection related tasks, sends out some keep alive messages ...By configuring this wait to be a little longer (doing an active wait) before actually going to sleep can prove to be beneficial in some ...
https://dev.mysql.com/doc/refman/8.0/en/resource-groups.html
MySQL supports creation and management of resource groups, and permits assigning threads running within the server to particular groups so that threads execute according to the resources available to the group. Group attributes enable control over ...Currently, CPU time is a manageable resource, represented by the concept of “virtual CPU” as a term that includes CPU cores, hyperthreads, hardware threads, and so ...
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 ...If you do not mind which member is the primary, the members can be upgraded in any ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-configuring-instances.html
This section explains the configuration settings required for MySQL Server instances that you want to use for Group Replication. Storage Engines Replication Framework Group Replication Settings Storage Engines For Group Replication, data must be ...