AWS Documentation » AWS CloudFormation » User Guide » Template Reference » Resource Property Types Reference » Amazon EMR InstanceGroupConfig CloudWatchAlarmDefinition

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Amazon EMR InstanceGroupConfig CloudWatchAlarmDefinition

The CloudWatchAlarmDefinition property specifies the conditions that trigger an automatic scaling activity. CloudWatchAlarmDefinition is a subproperty of the Amazon EMR InstanceGroupConfig ScalingTrigger property type.

Syntax

JSON

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{
  "ComparisonOperator" : String,
  "Dimensions" : [ MetricDimension, ... ],
  "EvaluationPeriods" : Integer,
  "MetricName" : String,
  "Namespace" : String,
  "Period" : Integer,
  "Statistic" : String,
  "Threshold" : Double,
  "Unit" : String
}

YAML

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  ComparisonOperator: String
  Dimensions:
    - MetricDimension
  EvaluationPeriods: Integer
  MetricName: String
  Namespace: String
  Period: Integer
  Statistic: String
  Threshold: Double
  Unit: String

Properties

ComparisonOperator

Determines how the metric specified by MetricName is compared to the value specified by Threshold.

Valid values: GREATER_THAN_OR_EQUAL, GREATER_THAN, LESS_THAN, or LESS_THAN_OR_EQUAL.

Required: Yes

Type: String

Dimensions

A list of CloudWatch metric dimensions.

Required: No

Type: List of Amazon EMR InstanceGroupConfig MetricDimension

EvaluationPeriods

The number of periods, expressed in seconds using the Period property, during which the alarm condition must exist before the alarm triggers automatic scaling activity. The default value is 1.

Required: No

Type: Integer

MetricName

The name of the CloudWatch metric that is watched to determine an alarm condition.

Required: Yes

Type: String

Namespace

The namespace for the CloudWatch metric. The default is AWS/ElasticMapReduce.

Required: No

Type: String

Period

The period, in seconds, over which the statistic for applying the metric associated with the alarm is applied. You specify the statistic in the Statistic property. CloudWatch metrics for Amazon EMR are emitted every five minutes (300 seconds). If you specify a CloudWatch metric for Amazon EMR, specify 300.

Required: Yes

Type: Integer

Statistic

The statistic to apply to the metric associated with the alarm. The default is AVERAGE.

Valid values: SAMPLE_COUNT, AVERAGE, SUM, MINIMUM, and MAXIMUM.

Required: No

Type: String

Threshold

The value against which the specified statistic is compared.

Required: Yes

Type: Double

Unit

The unit of measure associated with the CloudWatch metric being watched. Specify the unit specified in the CloudWatch metric.

For more information, see CloudWatchAlarmDefinition in the Amazon EMR API Reference.

Required: No

Type: String