The text provides an overview of a sample application utilizing the Couchbase Server Multi-Cluster Aware (MCA) Java client, which complements Couchbase's Cross-Data Center Replication (XDCR) capabilities. XDCR facilitates data replication across different clusters, essential for high availability and disaster recovery in large-scale, multi-data center deployments. The MCA client simplifies traffic management between clusters, reducing the complexity for developers by automatically redirecting traffic based on configuration. The sample application demonstrates the MCA client's functionality through a variety of database operations, such as reading, writing, and querying, across clusters, highlighting its inter-cluster failover behavior. The text also delves into the technical aspects of the MCA client setup, including cluster prioritization, failure detection, and client instantiation, while emphasizing the importance of these features in enhancing Couchbase's performance and reliability. It concludes with information on accessing the MCA client, which is currently available only in the Enterprise Edition, and offers further resources for interested users.