Changing the Specifications of a ClickHouse Cluster

Constraints

• You can only increase cluster specifications. To decrease cluster specifications, create a new cluster with the desired specifications and migrate data from the existing cluster.
• You can change the specifications of only one node type (the compute or ZooKeeper node) at a time. After the change, nodes in other types still maintain their original specifications.
• The entire cluster becomes temporarily unavailable during the specification change. Subsequent specification changes are not permitted until the current operation completes.
• You are advised to change the specifications during off-peak hours to avoid affecting services.

Prerequisites

You can perform specification expansion on a cluster when the cluster is in the In service state and no task is being performed (such as node scale-out and disk expansion).

Procedure

1. Log in to the CloudTable console.
2. Click Cluster Management.
3. In the cluster list, locate the row that contains the target cluster and choose More > Specification Expansion in the Operation column.
   

   You can also click Specification Expansion on the cluster details page to switch to the Specification Expansion page.

4. Configure Configured Node.
5. Select the CPU and memory specifications from the drop-down list.
6. Confirm the fee and resource quota, and click OK.

   After you click OK, the cluster status changes to Sub-health and the task status changes to Resizing Flavor. After the cluster specifications are changed, the cluster status changes to In service and the task status is cleared.

Specification Expansion Status