public void setOnDemandSpecification(OnDemandProvisioningSpecification onDemandSpecification) {
        this.onDemandSpecification = onDemandSpecification;
    }
<p>
The launch specification for On-Demand Instances in the instance fleet, which determines the allocation strategy.
</p>
<note>
<p>
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.
</p>
</note>

@param onDemandSpecification
       The launch specification for On-Demand Instances in the instance fleet, which determines the allocation
       strategy. </p> <note>
       <p>
       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.
       </p>
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/InstanceFleetProvisioningSpecifications.java