AWS Certified Solutions Architect – Associate (SAA-C03)Design Cost-Optimized ArchitecturesEasy
A data analytics company processes large datasets daily using Amazon EMR clusters. The input data is stored in Amazon S3, and the processed output is also written back to S3. The company wants to minimize data transfer costs between the EMR clusters and S3. Which architectural decision would be most cost-effective?
- AEnsure the EMR clusters and S3 buckets are in different AWS Regions.
- BCompress data only when transferring between S3 and EMR.
- CUse an AWS Direct Connect connection for data transfer between EMR and S3.
- DEnsure the EMR clusters and S3 buckets are in the same AWS Region.
Show answer & explanationAnswer & explanation
Correct answer: D. Ensure the EMR clusters and S3 buckets are in the same AWS Region.
Keeping EMR clusters and S3 buckets in the same AWS Region minimizes data transfer costs because data transfer within the same region (between services in the same Availability Zone or across different Availability Zones within the same region) is typically free or significantly cheaper than inter-region transfer.
Why the other options are wrong
- A. Storing data and compute in different regions will incur significant inter-region data transfer costs, which is explicitly what the company wants to minimize.
- B. Compressing data is a good practice for reducing storage and potentially transfer time, but it doesn't eliminate the cost of data transfer itself; the primary cost driver here is the regional placement.
- C. AWS Direct Connect is for connecting on-premises infrastructure to AWS and would not reduce costs for data transfer between AWS services within the cloud.
AWS Same-Region Data Transfer
Data transfer between AWS services within the same AWS Region is generally free or significantly cheaper than inter-region data transfer.
- Most data transfer between services within the same region is free.
- Applies to services like EC2, S3, RDS, Lambda, EMR, etc.
- Helps minimize operational costs.
- A key consideration for cost-optimized architecture design.
Memory trick: Regional Harmony Saves Your Money.