Service role for automatic scaling in EMR (Auto Scaling role) - Amazon EMR
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Service role for automatic scaling in EMR (Auto Scaling role)

The Auto Scaling role for EMR performs a similar function as the service role, but allows additional actions for dynamically scaling environments.

  • The default role name is EMR_AutoScaling_DefaultRole.

  • The default managed policy attached to EMR_AutoScaling_DefaultRole is AmazonElasticMapReduceforAutoScalingRole.

The contents of version 1 of AmazonElasticMapReduceforAutoScalingRole are shown below.

{ "Version": "2012-10-17", "Statement": [ { "Action": [ "cloudwatch:DescribeAlarms", "elasticmapreduce:ListInstanceGroups", "elasticmapreduce:ModifyInstanceGroups" ], "Effect": "Allow", "Resource": "*" } ] }

Your service role should use the following trust policy.


The following trust policy includes the aws:SourceArn and aws:SourceAccount global condition keys, which limit the permissions that you give Amazon EMR to particular resources in your account. Using them can protect you against the confused deputy problem.

{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Principal": { "Service": [ "", "" ] }, "Action": "sts:AssumeRole", "Condition": { "StringEquals": { "aws:SourceAccount": "<account-id>" }, "ArnLike": { "aws:SourceArn": "arn:aws:elasticmapreduce:<region>:<account-id>:*" } } } ] }