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    E-MapReduce:Scale out or in a StarRocks instance

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    E-MapReduce:Scale out or in a StarRocks instance

    Last Updated:Mar 26, 2026

    Scale your EMR Serverless StarRocks instance by adjusting the number of Frontend (FE) nodes. Add nodes to handle higher traffic and improve system performance, or remove nodes to reduce costs when demand drops.

    Prerequisites

    Before you begin, make sure that:

    • The instance is in the Running state

    • Your Alibaba Cloud account has no unpaid scale-out, scale-in, or renewal orders — pay or cancel any unpaid orders first

    Limitations

    Constraint Detail
    Maximum FE nodes An instance supports up to 11 FE nodes
    Minimum for scale-in Scale-in is available only when the current FE node count is greater than 3
    Storage threshold for scale-in Scale-in is blocked if total data volume exceeds 70% of the storage space available after scaling in. Back up or migrate data before retrying.

    Usage notes

    • Services may be interrupted during scale-out or scale-in. Make sure your application has a retry mechanism.

    • During a scale-out or scale-in operation, configuration upgrades or downgrades, configuration modifications, and version upgrades are not available.

    Add FE nodes

    1. Go to the details page of your EMR Serverless StarRocks instance.

      1. Log on to the EMR console.

      2. In the left-side navigation pane, choose EMR Serverless > StarRocks.

      3. In the top navigation bar, select the region where your instance resides.

      4. In the Instances section, click the name of the instance.

    2. On the Instance Details tab, go to the FE Details section and click Scale Out next to Number of Nodes.

    3. In the Scale Out panel, set the FE Number of Nodes parameter. If Scale-out Precheck shows Check Passed, click OK.

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      Note

      If the precheck fails, resources are insufficient in the current region or zone. Either reduce the number of FE nodes to add, or contact the EMR Serverless StarRocks team to request additional resources.

    4. Wait for the instance status to change from Scaling Out to Running. The new FE nodes are now active.

    Remove FE nodes

    1. On the Instance Details tab, go to the FE Details section and click Scale In.

    2. In the Scale In panel, set the FE Number of Nodes parameter. If Scale-in Precheck shows Check Passed, click OK.

    3. Wait for the instance status to change from Scaling In to Running. The selected FE nodes have been removed.

    What's next