This topic describes how to reduce the number of task nodes to scale in an E-MapReduce cluster.

Prerequisites

Currently, you can only reduce the number of task nodes to scale in an E-MapReduce cluster. The cluster you want to scale in must meet the following requirements:
  • If the E-MapReduce version is V2.X.X, the version is later than V2.5.0. If the E-MapReduce version is V3.X.X, the version is later than V3.2.0.
  • The cluster is in the Idle or Running state.
  • The billing method of the cluster is pay-as-you-go.

Procedure

  1. Log on to the Alibaba Cloud E-MapReduce console.
  2. In the top navigation bar, select the region where your cluster resides. Select the resource group as required. By default, all resources of the account appear.
  3. Click the Cluster Management tab.
  4. On the Cluster Management page that appears, find the target cluster and click Details in the Actions column.
  5. On the Cluster Overview page that appears, select Scale In from the Change Configuration drop-down list in the upper-right corner.
  6. In the Scale In dialog box that appears, click the downward arrow for Reserved Nodes or enter a number in this field to set the number of task nodes to retain.
  7. Click Scale In.
    In the Confirm Scale-in Activity dialog box that appears, click OK.