After you create an E-MapReduce (EMR) Serverless StarRocks instance, you can add frontend nodes (FEs) to the instance to meet your business requirements.
Prerequisites
The instance is in the Running state.
Your Alibaba Cloud account does not have unpaid scale-out, scale-in, or renewal orders.
If such an unpaid order exists, you must pay for the order or cancel the order.
Limits
Currently, you cannot remove FEs from a StarRocks instance. This operation will be supported in the future.
Precautions
During scale-in or scale-out, services may be interrupted. Make sure that you have a retry mechanism.
During scale-in or scale-out, you cannot perform operations such as configuration upgrade or downgrade, configuration modification, and version upgrade.
Add FEs to a StarRocks instance
If the precheck of scale-out fails, resources are insufficient in the current region or zone. In this case, you can reduce the number of FEs that you want to add to the instance or contact the EMR Serverless StarRocks team to provide sufficient resources.
Go to the details page of an EMR Serverless StarRocks instance.
Log on to the EMR console.
In the left-side navigation pane, choose .
In the top navigation bar, select a region based on your business requirements.
On the Instances tab, find the EMR Serverless StarRocks instance that you want to manage and click its name.
In the FE Details section of the Instance Details tab, click Scale Out to the right of the Number of Nodes parameter.
In the Scale Out panel, configure the FE Number of Nodes parameter. If the value of the Scale-out Precheck parameter is Check Passed, read the terms of service and click OK.
If the status of the instance changes from Scaling Out to Running, FEs are added to the instance.
References
If you want to modify the configurations of FEs in a StarRocks instance, you can perform the configuration upgrade or downgrade operation on the instance. For more information, see Upgrade or downgrade an instance.
If you want to increase or decrease the number of backend nodes (BEs) or compute nodes (CNs), you can scale out or scale in a warehouse. For more information, see Scale out or in a warehouse.
For more information about the billing methods and billing examples of a StarRocks instance, see the topics in the Billing methods directory.
If you have questions about the billing of your StarRocks instance, you can view your bills and billing details in the Expenses and Costs console. For more information, see View bills.