# DistributionSegment
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Use this structure to specify the capacity types that Amazon EC2 Auto Scaling prioritizes when it launches instances.

## Contents
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 ** TargetCapacityTypes.member.N **   
The capacity types to prioritize, in order. Amazon EC2 Auto Scaling attempts to launch instances in the priority order of the capacity types, and within each capacity type, in the order of instance types listed in your launch template `Overrides`.  
The following lists the valid values:    
on-demand-capacity-reservation  
On-Demand Capacity Reservations.  
capacity-block  
Capacity Blocks.  
interruptible-capacity-reservation  
Interruptible Capacity Reservations.  
on-demand  
On-Demand capacity. Include this value to allow the group to fall back to On-Demand capacity when the preceding capacity types are unavailable.
Type: Array of strings  
Valid Values: `on-demand-capacity-reservation | capacity-block | interruptible-capacity-reservation | on-demand`   
Required: No

## See Also
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For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon SDK for C\+\+](https://docs.amazonaws.cn/goto/SdkForCpp/autoscaling-2011-01-01/DistributionSegment) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/autoscaling-2011-01-01/DistributionSegment) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/autoscaling-2011-01-01/DistributionSegment)