Today, we are excited to announce that Amazon EMR now supports the price-capacity-optimized allocation strategy for Amazon EC2 Spot Instances for clusters launched with Instance Fleets. Allocation strategies let you determine how EMR selects from your specified instance types and Availability Zones to fulfill your desired capacity. Price-capacity-optimized allocation strategy makes Spot allocation decisions based on both spare capacity availability and Spot Instance price. As a result, you can run Spot Instances at a lower price and with a lower interruption rate.
Source:: Amazon AWS