# ScalingAction
<a name="API_ScalingAction"></a>

The type of adjustment the automatic scaling activity makes when triggered, and the periodicity of the adjustment.

## Contents
<a name="API_ScalingAction_Contents"></a>

 ** SimpleScalingPolicyConfiguration **   <a name="EMR-Type-ScalingAction-SimpleScalingPolicyConfiguration"></a>
The type of adjustment the automatic scaling activity makes when triggered, and the periodicity of the adjustment.  
Type: [SimpleScalingPolicyConfiguration](API_SimpleScalingPolicyConfiguration.md) object  
Required: Yes

 ** Market **   <a name="EMR-Type-ScalingAction-Market"></a>
Not available for instance groups. Instance groups use the market type specified for the group.  
Type: String  
Valid Values: `ON_DEMAND | SPOT`   
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/elasticmapreduce-2009-03-31/ScalingAction) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/elasticmapreduce-2009-03-31/ScalingAction) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/elasticmapreduce-2009-03-31/ScalingAction)