AWS Documentation » AWS CloudFormation » User Guide » Template Reference » AWS Resource and Property Types Reference » Amazon EMR Resource Types Reference » AWS::EMR::InstanceGroupConfig » Amazon EMR InstanceGroupConfig AutoScalingPolicy

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Amazon EMR InstanceGroupConfig AutoScalingPolicy

AutoScalingPolicy is a property of the AWS::EMR::InstanceGroupConfig resource that specifies the constraints and rules for an Auto Scaling group policy. For more information, see PutAutoScalingPolicy in the Amazon EMR API Reference.

Syntax

JSON

{
  "Constraints" : ScalingConstraints,
  "Rules" : [ ScalingRule ]
}

YAML

Constraints: 
  ScalingConstraints
Rules: 
  - ScalingRule

Properties

Constraints

The upper and lower Amazon EC2 instance limits for an automatic scaling policy. Automatic scaling activity doesn't cause an instance group to grow above or below these limits.

Required: Yes

Type: Amazon EMR InstanceGroupConfig ScalingConstraints

Update requires: No interruption

Rules

The scale-in and scale-out rules that compose the automatic scaling policy.

Required: Yes

Type: List of Amazon EMR InstanceGroupConfig ScalingRule

Update requires: No interruption

Example

The following example defines an AutoScalingPolicy for an InstanceGroupConfig resource.

JSON

"MyInstanceGroupConfig": {
  "Type": "AWS::EMR::InstanceGroupConfig",
  "Properties": {
    "InstanceCount": 1,
    "InstanceType": {
      "Ref": "InstanceType"
    },
    "InstanceRole": "TASK",
    "Market": "ON_DEMAND",
    "Name": "cfnTask",
    "JobFlowId": {
      "Ref": "MyCluster"
    },
    "AutoScalingPolicy": {
      "Constraints": {
        "MinCapacity": {
          "Ref": "MinCapacity"
        },
        "MaxCapacity": {
          "Ref": "MaxCapacity"
        }
      },
      "Rules": [
        {
          "Name": "Scale-out",
          "Description": "Scale-out policy",
          "Action": {
            "SimpleScalingPolicyConfiguration": {
              "AdjustmentType": "CHANGE_IN_CAPACITY",
              "ScalingAdjustment": 1,
              "CoolDown": 300
            }
          },
          "Trigger": {
            "CloudWatchAlarmDefinition": {
              "Dimensions": [
                {
                  "Key": "JobFlowId",
                  "Value": "${emr.clusterId}"
                }
              ],
              "EvaluationPeriods": 1,
              "Namespace": "AWS/ElasticMapReduce",
              "Period": 300,
              "ComparisonOperator": "LESS_THAN",
              "Statistic": "AVERAGE",
              "Threshold": 15,
              "Unit": "PERCENT",
              "MetricName": "YARNMemoryAvailablePercentage"
            }
          }
        },
        {
          "Name": "Scale-in",
          "Description": "Scale-in policy",
          "Action": {
            "SimpleScalingPolicyConfiguration": {
              "AdjustmentType": "CHANGE_IN_CAPACITY",
              "ScalingAdjustment": -1,
              "CoolDown": 300
            }
          },
          "Trigger": {
            "CloudWatchAlarmDefinition": {
              "Dimensions": [
                {
                  "Key": "JobFlowId",
                  "Value": "${emr.clusterId}"
                }
              ],
              "EvaluationPeriods": 1,
              "Namespace": "AWS/ElasticMapReduce",
              "Period": 300,
              "ComparisonOperator": "GREATER_THAN",
              "Statistic": "AVERAGE",
              "Threshold": 75,
              "Unit": "PERCENT",
              "MetricName": "YARNMemoryAvailablePercentage"
            }
          }
        }
      ]
    }
  }
}

YAML

MyInstanceGroupConfig:
  Type: 'AWS::EMR::InstanceGroupConfig'
  Properties:
    InstanceCount: 1
    InstanceType: !Ref InstanceType
    InstanceRole: TASK
    Market: ON_DEMAND
    Name: cfnTask
    JobFlowId: !Ref MyCluster
    AutoScalingPolicy:
      Constraints:
        MinCapacity: !Ref MinCapacity
        MaxCapacity: !Ref MaxCapacity
      Rules:
        - Name: Scale-out
          Description: Scale-out policy
          Action:
            SimpleScalingPolicyConfiguration:
              AdjustmentType: CHANGE_IN_CAPACITY
              ScalingAdjustment: 1
              CoolDown: 300
          Trigger:
            CloudWatchAlarmDefinition:
              Dimensions:
                - Key: JobFlowId
                  Value: '${emr.clusterId}'
              EvaluationPeriods: 1
              Namespace: AWS/ElasticMapReduce
              Period: 300
              ComparisonOperator: LESS_THAN
              Statistic: AVERAGE
              Threshold: 15
              Unit: PERCENT
              MetricName: YARNMemoryAvailablePercentage
        - Name: Scale-in
          Description: Scale-in policy
          Action:
            SimpleScalingPolicyConfiguration:
              AdjustmentType: CHANGE_IN_CAPACITY
              ScalingAdjustment: -1
              CoolDown: 300
          Trigger:
            CloudWatchAlarmDefinition:
              Dimensions:
                - Key: JobFlowId
                  Value: '${emr.clusterId}'
              EvaluationPeriods: 1
              Namespace: AWS/ElasticMapReduce
              Period: 300
              ComparisonOperator: GREATER_THAN
              Statistic: AVERAGE
              Threshold: 75
              Unit: PERCENT
              MetricName: YARNMemoryAvailablePercentage