EMR Nodes Are Not Scaling
Check for these common causes of unsuccessful scaling:
Instance group at capacity
Check if the instance group is already at the minimum or maximum capacity specified in the automatic scaling rule. You specify the minimum and maximum number of instances when you create automatic scaling rules for the cluster. For more information on automatic scaling rules, see
Termination protection
If you enable termination protection on the Amazon EMR cluster, no Amazon Elastic Compute Cloud (Amazon EC2) instances are terminated in response to scaling activity.
For more information on termination protection, see
IAM policy
If you're using custom AWS Identity and Access Management (IAM) policies, verify that you have the correct permissions to perform scaling activity in your Amazon EMR role, EMR-EC2 role, and EMR-automatic scaling role. For an example of how to use inline policies for these roles, see
EC2 usage limit
Check if Amazon EMR returned an "EC2 QUOTA EXCEEDED" error. This error means that you reached your EC2 usage limit. You can submit a Service Limit Increase request for your EC2 instances.
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EMR Nodes Are Not Scaling
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Check for these common causes of slow scale-downs: Instance group in an arrested state Check if the instance group is in
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