Enable or disable auto scaling for Hadoop clusters - E-MapReduce

When your workload fluctuates, enable auto scaling so that E-MapReduce automatically adds or removes task nodes. Disable auto scaling when you need to change instance configurations or when your workload stabilizes.

Prerequisites

You have configured auto scaling. For more information, see Configure auto scaling (Hadoop clusters only).

Notes

You can disable auto scaling only when the scaling group contains no instances. If instances exist, remove them first by setting a scale-in rule or changing the maximum number of instances to 0.

Procedure

Go to the Auto Scaling page.
1. Log on to the EMR console.
2. In the top navigation bar, select a region and a resource group.
3. On the EMR on ECS page, click the name of the target cluster.
4. Click the Auto Scaling tab.
On the Configure Scaling page, you can enable or disable auto scaling.
- Enable auto scaling: For the target auto scaling group, turn on the switch in the Auto Scaling Status column.
  
  After you enable auto scaling, if you modify the basic information or trigger rules, you must click Apply Latest Configuration on the Configure Auto Scaling page.
- Disable auto scaling: For the target auto scaling group, turn off the switch in the Auto Scaling Status column.