This is the new *CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [AWS CloudFormation User Guide](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html).

# AWS::EMR::InstanceFleetConfig OnDemandProvisioningSpecification
<a name="aws-properties-emr-instancefleetconfig-ondemandprovisioningspecification"></a>

 The launch specification for On-Demand Instances in the instance fleet, which determines the allocation strategy. 

**Note**  
The instance fleet configuration is available only in Amazon EMR releases 4.8.0 and later, excluding 5.0.x versions. On-Demand Instances allocation strategy is available in Amazon EMR releases 5.12.1 and later.

## Syntax
<a name="aws-properties-emr-instancefleetconfig-ondemandprovisioningspecification-syntax"></a>

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

### JSON
<a name="aws-properties-emr-instancefleetconfig-ondemandprovisioningspecification-syntax.json"></a>

```
{
  "[AllocationStrategy](#cfn-emr-instancefleetconfig-ondemandprovisioningspecification-allocationstrategy)" : String,
  "[CapacityReservationOptions](#cfn-emr-instancefleetconfig-ondemandprovisioningspecification-capacityreservationoptions)" : OnDemandCapacityReservationOptions
}
```

### YAML
<a name="aws-properties-emr-instancefleetconfig-ondemandprovisioningspecification-syntax.yaml"></a>

```
  [AllocationStrategy](#cfn-emr-instancefleetconfig-ondemandprovisioningspecification-allocationstrategy): String
  [CapacityReservationOptions](#cfn-emr-instancefleetconfig-ondemandprovisioningspecification-capacityreservationoptions): 
    OnDemandCapacityReservationOptions
```

## Properties
<a name="aws-properties-emr-instancefleetconfig-ondemandprovisioningspecification-properties"></a>

`AllocationStrategy`  <a name="cfn-emr-instancefleetconfig-ondemandprovisioningspecification-allocationstrategy"></a>
Specifies the strategy to use in launching On-Demand instance fleets. Available options are `lowest-price` and `prioritized`. `lowest-price` specifies to launch the instances with the lowest price first, and `prioritized` specifies that Amazon EMR should launch the instances with the highest priority first. The default is `lowest-price`.  
*Required*: Yes  
*Type*: String  
*Allowed values*: `lowest-price | prioritized`  
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)

`CapacityReservationOptions`  <a name="cfn-emr-instancefleetconfig-ondemandprovisioningspecification-capacityreservationoptions"></a>
The launch specification for On-Demand instances in the instance fleet, which determines the allocation strategy.  
*Required*: No  
*Type*: [OnDemandCapacityReservationOptions](aws-properties-emr-instancefleetconfig-ondemandcapacityreservationoptions.md)  
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)