A data engineering team uses Amazon EMR for big data processing. The clusters are transient; they are spun up daily, process data for 4 hours, and are then terminated. The workload is fault-tolerant and can handle node interruptions. What is the MOST cost-effective EC2 purchasing option for the EMR task nodes?

Answer options:

On-Demand Instances

Reserved Instances

Spot Instances

Dedicated Hosts

How to approach this question

Match the workload characteristics (fault-tolerant, transient) to the pricing model.

Full Answer

C.Spot Instances✓ Correct

Amazon EC2 Spot Instances let you take advantage of unused EC2 capacity at steep discounts. Because EMR task nodes only process data and do not store HDFS data, they are fault-tolerant and perfect for Spot Instances.

Common mistakes

Choosing RIs for a workload that only runs 4 hours a day.

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