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https://dev.mysql.com/doc/refman/8.0/en/group-replication-cloning.html
If you want to use remote cloning operations for distributed recovery in a group, you must set up existing members and joining members beforehand to support this function. If you do not want to use this function in a group, do not set it up, in ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-network-partitioning.html
The group needs to achieve consensus whenever a change that needs to be replicated happens. This is the case for regular transactions but is also required for group membership changes and some internal messaging that keeps the group consistent. In ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-view-changes.html
When Group Replication's distributed recovery process is carrying out state transfer from the binary log, to synchronize the joining member with the donor up to a specific point in time, the joining member and donor make use of GTIDs (see Section ...However, GTIDs only provide a means to realize which transactions the joining member is ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-multi-primary-mode.html
In multi-primary mode (group_replication_single_primary_mode=OFF) no member has a special role. Any member that is compatible with the other group members is set to read/write mode when joining the group, and can process write transactions, even if ...If a member stops accepting write transactions, for example, in the event of an unexpected server exit, clients connected to it can be redirected, or failed over, to any other member that is in read/write ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-responses-failure-exit.html
The group_replication_exit_state_action system variable, which is available from MySQL 8.0.12 and MySQL 5.7.24, specifies what Group Replication does when the member leaves the group unintentionally due to an error or problem, and either fails to ...In order of impact, the exit actions are as follows: If READ_ONLY is the exit action, the instance switches MySQL to super read only mode by setting the system variable super_read_only to ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-understanding-consistency-guarantees.html
In terms of distributed consistency guarantees, either in normal or failure repair operations, Group Replication has always been an eventual consistency system. This means that as soon as the incoming traffic slows down or stops, all group members ...The events that relate to the consistency of a system can be split into control operations, either manual or automatically triggered by failures; and data flow ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-configuring-consistency-guarantees.html
Although the Transaction Synchronization Points section explains that conceptually there are two synchronization points from which you can choose: on read or on write, these terms were a simplification and the terms used in Group Replication are: ...A read/write transaction does not wait for other members to apply a ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-distributed-recovery-connections.html
When state transfer from the donor's binary log is in progress over this connection (using the asynchronous replication channel group_replication_recovery), the joining member acts as the replica and the existing member acts as the source. When a ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-distributed-recovery.html
Whenever a member joins or rejoins a replication group, it must catch up with the transactions that were applied by the group members before it joined, or while it was away. The joining member begins by checking the relay log for its ...After this, ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-member-actions.html
From MySQL 8.0.26, Group Replication has the capability to set actions for the members of a group to take in specified situations. The member actions configuration for a server can also be reset to the default after it has left the group. In that ...