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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-ip-address-permissions.html
When and only when the XCom communication stack is used for establishing group communications (group_replication_communication_stack=XCOM), the Group Replication plugin lets you specify an allowlist of hosts from which an incoming Group ...If you ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-monitoring.html
Replication channels created by the Group Replication plugin are listed here: group_replication_recovery: Used for replication changes related to distributed recovery. You can use the MySQL Performance Schema to monitor Group Replication. These ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-multi-primary-mode.html
(In a group that is running in single-primary mode, new members default to read-only in any case.) Members take into account the major.minor.release version of the MySQL software (and thus, of the Group Replication plugin) when checking their ... In ...
https://dev.mysql.com/doc/refman/8.4/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/8.4/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/8.4/en/group-replication-performance-message-fragmentation.html
As with most other Group Replication system variables, you must restart the Group Replication plugin for the change to take effect. When an abnormally large message is sent between Group Replication group members, it can result in some group ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-probes-and-statistics.html
Such probes are scattered throughout the plugin stack and allow one to establish metrics, such as: the certifier queue size; the replication applier queue size; the total number of transactions certified; the total number of remote transactions ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-replication-group-member-stats.html
This information can also help you to decide how to adjust the flow control of the Group Replication plugin, see Section 20.7.2, “Flow Control”. Each member in a replication group certifies and applies transactions received by the group.
https://dev.mysql.com/doc/refman/8.4/en/group-replication-responses-failure-rejoin.html
With auto-rejoin, when the member's expulsion or unreachable majority timeout is reached, it makes an attempt to rejoin (using the current plugin option values), then continues to make further auto-rejoin attempts up to the specified number of tries. The group_replication_autorejoin_tries system variable makes a member that has been expelled or reached its unreachable majority timeout try to rejoin the group ...