ApsaraDB RDS:Upgrade from RDS High-availability Edition to RDS Cluster Edition

Scenarios

Cluster Edition adds these capabilities to High-availability Edition:

• Readable secondary nodes -- Offload read traffic to secondary nodes without deploying separate read-only instances.

• Node addition and deletion -- Scale compute resources by adding or removing nodes as demand changes.

• Multi-zone disaster recovery -- Distribute nodes across availability zones for higher fault tolerance.

• Node-level monitoring -- Monitor CPU, memory, IOPS, and connections per node instead of only at the instance level.

• Node topology management -- View and manage the roles and status of each node in a visual topology.

Compare all editions in RDS Cluster Edition.

Prerequisites

Your RDS instance must meet all of the following requirements:

• MySQL version 8.0 or 5.7

• RDS High-availability Edition (verify in the Basic Information page, Type and Edition field)

• ESSD or Premium ESSD storage type

• Standard product type

• Minor engine version 20201031 or later

• No read-only instances attached to the RDS instance

Impacts

• Data migration and downtime -- The upgrade may trigger a data migration (10–20 minutes). After migration, the system performs an instance switchover at the time you specify, briefly interrupting active connections. Ensure your application reconnects automatically. Impacts of an instance switchover.

• No application changes required -- The instance endpoint stays the same. No connection string updates are needed.

Billing

The upgrade is treated as a specification change. Specification changes.

Upgrade the edition

1. Go to the Instances page. In the top navigation bar, select the region where your RDS instance resides, then click the instance ID.

2. In the Configuration Information section, click Change Specifications.

3. For subscription instances only: select Upgrade and click Next.

4. Configure the following parameters:

   Parameter	Description
   Edition	Select Cluster Edition. Note If this option is not available, your instance uses Premium Local SSD or standard SSD storage. Upgrade the storage type first (see Prerequisites).
   Storage Type	Select the storage type for the upgraded instance. Options vary by configuration and region. Displayed only when multiple types are available.
   Instance Type	Select the instance type (vCPU and memory combination) for the upgraded instance.
   Storage Capacity	Set the storage capacity for your workload.
   Switching Time	Choose when the instance switchover runs after data migration: Execute Immediately -- Data migration starts immediately without affecting workloads. The switchover runs as soon as migration finishes. Impacts of an instance switchover. Switch Within Maintenance Window -- Data migration starts immediately without affecting workloads. The switchover runs during the specified maintenance window.

5. Click Pay Now, review the instance specifications before and after the change, and click Continue to complete the payment.

Verify the upgrade

1. On the Basic Information page of your RDS instance, check the Type and Edition field.

2. If the value is Regular Instance (Cluster Edition), the upgrade succeeded.