Many organizations today have already migrated Hadoop workloads to cloud infrastructure or they are actively planning to do such a migration. A common question in this scenario is "Which instance types should I use for my Hadoop cluster?" There are nuances to cloud infrastructure that require careful consideration when deciding which instances types to use. This session will show the results of performance comparison of Amazon Web Services (AWS) Elastic Compute Cloud (EC2) instance types commonly used in Hadoop clusters. More importantly, we will discuss the relative cost comparison of these instance types to demonstrate the which AWS instances offer the best price to performance ratio using standard benchmarks. Attendees of this session with leave with a better understanding of the performance of AWS EC2 instance types when used for Hadoop workloads and be able to make more informed decisions about which instance types makes the most sense for their needs.