This topic describes how to add a task node group to an E-MapReduce (EMR) cluster.


A Hadoop cluster is created. For more information, see Create a cluster.

Background information

You can add node groups to meet your requirements for different instances. For example, you can use memory optimized instances with 1 vCPU and 8 GiB of memory to support big data offline processing and use compute optimized instances with 1 vCPU and 2 GiB of memory to support model training.
Notice If you want to add a core node group to a Hadoop cluster, submit a ticket.


You can add a maximum of 10 task node groups to a Hadoop cluster.


  1. Go to the Cluster Overview page of your cluster.
    1. Log on to the Alibaba Cloud EMR console.
    2. In the top navigation bar, select the region where your cluster resides and select a resource group based on your business requirements.
    3. Click the Cluster Management tab.
    4. On the Cluster Management page, find your cluster and click Details in the Actions column.
  2. On the Cluster Overview page, choose Change Configuration > Scale Out.
  3. In the Scale Out dialog box, click the TASK (Task Instance Group) tab.
  4. On the TASK (Task Instance Group) tab, perform the following operations:
    1. Optional:Click the Create Node Group tab.
    2. On the Create Node Group tab, specify Node Group Name.
      Note The node group name must be unique in the cluster.
    3. Configure other parameters based on your requirements.
    4. Read the terms of service and select E-MapReduce Service Terms.
    5. Click Create Node Group.
    After the node group is added, you can view the node group information in the Instance Info section of the Cluster Overview page.