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AWS CloudFormation
User Guide (API Version 2010-05-15)

Amazon EMR Cluster JobFlowInstancesConfig ScalingAction

ScalingAction is a subproperty of the Amazon EMR Cluster JobFlowInstancesConfig property that specifies the scaling actions for an Auto Scaling group policy.

Syntax

JSON

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

YAML

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AdjustmentType: String CoolDown: Integer ScalingAdjustment: String

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 a decimal. For example, 0.20 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.

Valid values: CHANGE_IN_CAPACITY, PERCENT_CHANGE_IN_CAPACITY, or EXACT_CAPACITY.

Required: No

Type: String

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

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 a decimal. For example, -0.20 indicates a decrease in 20% increments of cluster capacity.

Required: Yes

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