AWS CloudFormation
User Guide (Version )

AWS::EMR::Cluster SimpleScalingPolicyConfiguration

SimpleScalingPolicyConfiguration is a subproperty of the ScalingAction property type. SimpleScalingPolicyConfiguration determines how an automatic scaling action adds or removes instances, the cooldown period, and the number of EC2 instances that are added each time the CloudWatch metric alarm condition is satisfied.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{ "AdjustmentType" : String, "CoolDown" : Integer, "ScalingAdjustment" : Integer }

YAML

AdjustmentType: String CoolDown: Integer ScalingAdjustment: Integer

Properties

AdjustmentType

The way in which EC2 instances are added (if ScalingAdjustment is a positive number) or terminated (if ScalingAdjustment is a negative number) each time the scaling activity is triggered. CHANGE_IN_CAPACITY is the default. CHANGE_IN_CAPACITY indicates that the EC2 instance count increments or decrements by ScalingAdjustment, which should be expressed as an integer. PERCENT_CHANGE_IN_CAPACITY indicates the instance count increments or decrements by the percentage specified by ScalingAdjustment, which should be expressed as an integer. For example, 20 indicates an increase in 20% increments of cluster capacity. EXACT_CAPACITY indicates the scaling activity results in an instance group with the number of EC2 instances specified by ScalingAdjustment, which should be expressed as a positive integer.

Required: No

Type: String

Allowed Values: CHANGE_IN_CAPACITY | EXACT_CAPACITY | PERCENT_CHANGE_IN_CAPACITY

Update requires: No interruption

CoolDown

The amount of time, in seconds, after a scaling activity completes before any further trigger-related scaling activities can start. The default value is 0.

Required: No

Type: Integer

Update requires: No interruption

ScalingAdjustment

The amount by which to scale in or scale out, based on the specified AdjustmentType. A positive value adds to the instance group's EC2 instance count while a negative number removes instances. If AdjustmentType is set to EXACT_CAPACITY, the number should only be a positive integer. If AdjustmentType is set to PERCENT_CHANGE_IN_CAPACITY, the value should express the percentage as an integer. For example, -20 indicates a decrease in 20% increments of cluster capacity.

Required: Yes

Type: Integer

Update requires: No interruption

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