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https://dev.mysql.com/doc/refman/8.0/en/group-replication-message-compression.html
For messages sent between online group members, Group Replication enables message compression by default. Whether a specific message is compressed depends on the threshold that you configure using the group_replication_compression_threshold system ...Messages that have a payload larger than the specified number of bytes are ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-responses-failure-partition.html
By default, members that find themselves in a minority due to a network partition do not automatically leave the group. You can use the system variable group_replication_unreachable_majority_timeout to set a number of seconds for a member to wait ...From MySQL 8.0.21, this feature is activated by default and the member makes three auto-rejoin ...
https://dev.mysql.com/doc/refman/8.0/en/replication-privilege-checks-gr.html
From MySQL 8.0.19, as well as securing asynchronous and semi-synchronous replication, you may choose to use a PRIVILEGE_CHECKS_USER account to secure the two replication applier threads used by Group Replication. The group_replication_applier ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-gr-memory-monitoring-ps-instruments.html
From MySQL 8.0.30, Performance Schema provides instrumentation for performance monitoring of Group Replication memory usage. The memory/group_rpl/ Performance Schema instrumentation was updated in 8.0.30 to extend monitoring of Group Replication ...
https://dev.mysql.com/doc/refman/8.0/en/stop-group-replication.html
This statement requires the GROUP_REPLICATION_ADMIN privilege (or the deprecated SUPER privilege). As soon as you issue STOP GROUP_REPLICATION the member is set to super_read_only=ON, which ensures that no writes can be made to the member while ...
https://dev.mysql.com/doc/refman/8.0/en/group-by-functional-dependence.html
The following discussion provides several examples of the ways in which MySQL detects functional dependencies. The examples use this notation: {X} -> {Y} Understand this as “X uniquely determines Y,” which also means that Y is functionally ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-user-credentials.html
Group Replication uses a distributed recovery process to synchronize group members when joining them to the group. Distributed recovery involves transferring transactions from a donor's binary log to a joining member using a replication channel ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-replication-group-members-table.html
This table shows network and status information for replication group members. The network addresses shown are the addresses used to connect clients to the group, and should not be confused with the member's internal group communication address ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-deploying-in-multi-primary-or-single-primary-mode.html
Group Replication operates either in single-primary mode or in multi-primary mode. The group's mode is a group-wide configuration setting, specified by the group_replication_single_primary_mode system variable, which must be the same on all members. It is not possible to have members of the group deployed in different modes, for example one member configured in multi-primary mode while another member is in single-primary ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-change-primary.html
This section explains how to change which member of a single-primary group is the primary, using the group_replication_set_as_primary() function, which can be can be run on any member of the group. When this is done, the current primary becomes a ...This is recommended for all MySQL versions, and enforced beginning with MySQL ...