Tair（Redis OSS-compatible） standard instances use a master-replica architecture. In this architecture, the replica node is used only for failover and does not process read or write requests. If the master node fails, the high availability (HA) system automatically performs a master-replica switchover to ensure service continuity.
An HA cluster architecture consists of multiple master-replica pairs. The replica nodes are used only for failover and do not process read or write requests.
If you want to use read replicas to implement read/write splitting, you can use the read/write splitting architecture. A read/write splitting instance that is deployed in cloud-native mode can contain up to nine read replicas. This allows you to easily handle read-heavy workloads. For more information, see Read/write splitting instances.