MySQL 8.0 Reference Manual Including MySQL NDB Cluster 8.0

18.8 Group Replication System Variables

These are the system variables that are specific to the Group Replication plugin. Every configuration option is prefixed with "group_replication".

  • Although most variables are described as dynamic and can be changed while the server is running, most changes only take effect upon restarting the Group Replication plugin. Variables which can be changed without requiring a restart of the plugin are specifically noted as such in this section.

  • Variables that specify IP addresses or host names for group members are not validated until a START GROUP_REPLICATION statement is issued. Group Replication's Group Communication System (GCS) is not available to validate the values until that point.

  • A number of variables for Group Replication are not completely validated during server startup if they are passed as command line arguments to the server. These variables include group_replication_group_name, group_replication_single_primary_mode, group_replication_force_members, the SSL variables, and the flow control variables. They are only fully validated after the server has started.

Group Replication Status Variable

This section describes the status variables which provide information about Group Replication. The variable has the following meaning: