This chapter explains MySQL Group Replication and how to install, configure and monitor groups. MySQL Group Replication is a MySQL Server plugin that enables you to create elastic, highly-available, fault-tolerant replication topologies.

Groups can operate in a single-primary mode with automatic primary election, where only one server accepts updates at a time. Alternatively, for more advanced users, groups can be deployed in multi-primary mode, where all servers can accept updates, even if they are issued concurrently.

There is a built-in group membership service that keeps the view of the group consistent and available for all servers at any given point in time. Servers can leave and join the group and the view is updated accordingly. Sometimes servers can leave the group unexpectedly, in which case the failure detection mechanism detects this and notifies the group that the view has changed. This is all automatic.

The chapter is structured as follows:

Section 21.1, “Group Replication Background” provides an introduction to groups and how Group Replication works.
Section 21.2, “Getting Started” explains how to configure multiple MySQL Server instances to create a group.
Section 21.3, “Monitoring Group Replication” explains how to monitor a group.
Section 21.5, “Group Replication Security” explains how to secure a group.
Section 21.9, “Group Replication Technical Details” provides in-depth information about how Group Replication works.

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