For more information about purchasing options see Instance Purchasing Options

For more information about purchasing options see

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physically isolated at the host hardware level from instances that belong to other AWS accounts. For more information about purchasing options, see Instance Purchasing Options in the Amazon EC2 User Guide for Linux Instances . Using Reserved Instances To use Reserved Instances in Amazon EMR, you use Amazon EC2 to purchase the Reserved Instance and specify the parameters of the reservation, including the scope of the reservation as applying to either a region or an Availability Zone. For more information, see Amazon EC2 Reserved Instances and Buying Reserved Instances in the Amazon EC2 User Guide for Linux Instances . After you purchase a Reserved Instance, if all of the following conditions are true, Amazon EMR uses the Reserved Instance when a cluster launches: An On-Demand Instance is specified in the cluster configuration that matches the Reserved Instance specification The cluster is launched within the scope of the instance reservation (the Availability Zone or region) The Reserved Instance capacity is still available For example, let's say you purchase one m5.xlarge Reserved Instance with the instance reservation scoped to the US-East region. You then launch an EMR cluster in US-East that uses two m5.xlarge instances. The first instance is billed at the Reserved Instance rate and the other is billed at the On- Demand rate. Reserved Instance capacity is used before any On-Demand Instances are created. Using Dedicated Instances To use Dedicated Instances, you purchase Dedicated Instances using Amazon EC2 and then create a VPC with the Dedicated tenancy attribute. Within Amazon EMR, you then specify that a cluster should launch in this VPC. Any On-Demand Instances in the cluster that match the Dedicated Instance specification use available Dedicated Instances when the cluster launches. Note Amazon EMR does not support setting the dedicated attribute on individual instances. 108
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Amazon EMR Management Guide Configure EC2 Instances Spot Instances Spot Instances in Amazon EMR provide an option for you to purchase Amazon EC2 instance capacity at a reduced cost as compared to On-Demand purchasing. The disadvantage of using Spot Instances is that instances may terminate unpredictably as prices fluctuate. For more information about when using Spot Instances may be appropriate for your application, see When Should You Use Spot Instances? (p. 132) . When Amazon EC2 has unused capacity, it offers EC2 instances at a reduced cost, called the Spot price . This price fluctuates based on availability and demand, and is established by region and Availability Zone. When you choose Spot Instances, you specify the maximum Spot price that you're willing to pay for each EC2 instance type. When the Spot price in the cluster's Availability Zone is below the maximum Spot price specified for that instance type, the instances launch. While instances run, you're charged at the current Spot price not your maximum Spot price .
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  • Spring '12
  • LauraParker
  • Amazon Web Services, Amazon Elastic Compute Cloud

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