Group Changes with MariaDB Xpand


MariaDB Xpand performs a group change when the cluster detects a change in cluster membership:

  • Xpand maintains a set of all nodes that can currently communicate with each other, which is referred to as the group

  • Xpand performs a group change when a node is added to or removed from the group

  • Group changes have many causes, including scale up/down operations, node or zone failures, or failed heartbeat checks

  • The duration of a group change is typically a few seconds

  • Xpand performs many types of actions during a group change, such as recalculating quorum and ensuring fault tolerance

  • When Xpand performs a group change, it can have an impact on transactions, queries, and connections


For details about group changes, choose an Xpand version: