Group Replication System Variables Type Enumeration Default Value ( ≥  8.0.16) READ_ONLY Default Value ( ≥  8.0.12,  ≤  8.0.15) ABORT_SERVER Valid Values ( ≥  8.0.18) ABORT_SERVER OFFLINE_MODE READ_ONLY Valid Values ( ≥  8.0.12,  ≤  8.0.17) ABORT_SERVER READ_ONLY The value of this system variable can be changed while Group Replication is running, and the change takes effect immediately. The system variable’s current value is read when an issue occurs that means the behavior is needed. group_replication_exit_state_action  configures how Group Replication behaves when this server instance leaves the group unintentionally, for example after encountering an applier error, or in the case of a loss of majority, or when another member of the group expels it due to a suspicion timing out. The timeout period for a member to leave the group in the case of a loss of majority is set by the group_replication_unreachable_majority_timeout  system variable, and the timeout period for suspicions is set by the  group_replication_member_expel_timeout  system variable. Note that an expelled group member does not know that it was expelled until it reconnects to the group, so the specified action is only taken if the member manages to reconnect, or if the member raises a suspicion on itself and expels itself. When a group member is expelled due to a suspicion timing out or a loss of majority, if the member has the  group_replication_autorejoin_tries  system variable set to specify a number of auto-rejoin attempts, it first makes the specified number of attempts while in super read only mode, and then follows the action specified by  group_replication_exit_state_action . Auto-rejoin attempts are not made in case of an applier error, because these are not recoverable. When  group_replication_exit_state_action  is set to  READ_ONLY , if the member exits the group unintentionally or exhausts its auto-rejoin attempts, the instance switches MySQL to super read only mode (by setting the system variable  super_read_only  to  ON ). The  READ_ONLY  exit action was the behavior for MySQL 8.0 releases before the system variable was introduced, and became the default again from MySQL 8.0.16. When  group_replication_exit_state_action  is set to  OFFLINE_MODE , if the member exits the group unintentionally or exhausts its auto-rejoin attempts, the instance switches MySQL to offline mode (by setting the system variable  offline_mode  to  ON ). In this mode, connected client users are disconnected on their next request and connections are no longer accepted, with the exception of client users that have the  CONNECTION_ADMIN  privilege (or the deprecated  SUPER  privilege). Group Replication also sets the system variable  super_read_only  to  ON , so clients cannot make 3806