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    E-MapReduce:Manage node groups (Hadoop, Data Science, and EMR Studio clusters)

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    E-MapReduce:Manage node groups (Hadoop, Data Science, and EMR Studio clusters)

    Last Updated:Sep 21, 2026

    This topic describes how to add, modify, and remove node groups.

    Background information

    You can add node groups to meet your requirements for different types of instances. For example, you can use memory optimized instances with 1 vCPU and 8 GiB of memory to support offline big data processing and use compute optimized instances with 1 vCPU and 2 GiB of memory to support model training.

    Prerequisites

    A Hadoop cluster, Data Science cluster, or E-MapReduce (EMR) Studio cluster is created in the EMR console. For more information, see Create a cluster.

    Prerequisites

    • You can add core node groups and task node groups.

    • You can add up to 10 node groups.

    • You can remove only task node groups. You cannot remove core node groups.

    Precautions

    If the number of nodes in the node group that you want to remove is greater than 0, you must release the Elastic Compute Service (ECS) instances in the node group before you remove the node group.

    Add a node group

    1. Go to the node management page.

      1. Log on to the EMR console.

      2. In the top navigation bar, select a region and a resource group as needed.

      3. In the Actions column of the target cluster, click Nodes.

    2. On the Nodes page, click Add Node Group.

    3. In the Add Node Group panel, configure the following parameters.

      Parameter

      Description

      Node Group Type

      Valid values: CORE (Core Node Group) and TASK (Task Node Group).

      Billing Method

      The billing method of the node group.

      Node Group Name

      The name of the node group. The name of the node group must be unique.

      vSwitch

      Select a vSwitch in the current virtual private cloud (VPC). You cannot change the vSwitch after the node group is added.

      Instance Type

      The instance type for the node group. You can select an instance type based on your business requirements.

      Storage Configuration

      • System Disk: Select an Enhanced SSD (ESSD) or Ultra Disk. The disk size can range from 60 GiB to 500 GiB. A minimum of 120 GiB is recommended.

      • Data Disk: Select an Enhanced SSD (ESSD) or Ultra Disk. The disk size can range from 40 GiB to 32,768 GiB. A minimum of 80 GiB is recommended.

    4. Click OK.

      After the node group is added, you can view it on the Nodes page.

    Modify a node group

    1. Go to the node management page.

      1. Log on to the EMR console.

      2. In the top navigation bar, select a region and a resource group as needed.

      3. In the Actions column of the target cluster, click Nodes.

    2. On the Nodes page, click the name of the target node group in the Node Group Name column.

    3. In the Node Group Attributes dialog box, modify the node group name and click Save.

    Remove a node group

    1. Go to the node management page.

      1. Log on to the EMR console.

      2. In the top navigation bar, select a region and a resource group as needed.

      3. In the Actions column of the target cluster, click Nodes.

    2. On the Nodes page, find the target node group and click Delete Node Group in the Actions column.

      Note

      You must release the ECS instances in the node group before you remove the node group.

    3. In the Tips dialog box, click Delete.

    References