AWS Certified Solutions Architect - Associate
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An online photo-sharing company stores its photos in an Amazon S3 bucket that exists in the us-west-1 Region. The company needs to store a copy of all new photos in the us-east-1 Region.
Which solution will meet this requirement with the LEAST operational effort?
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UAnonymous
A
Create a second S3 bucket in us-east-1. Use S3 Cross-Region Replication to copy photos from the existing S3 bucket to the second S3 bucket.
B
Create a cross-origin resource sharing (CORS) configuration of the existing S3 bucket. Specify us-east-1 in the CORS rule's AllowedOrigin element.
C
Create a second S3 bucket in us-east-1 across multiple Availability Zones. Create an S3 Lifecycle rule to save photos into the second S3 bucket.
D
Create a second S3 bucket in us-east-1. Configure S3 event notifications on object creation and update events to invoke an AWS Lambda function to copy photos from the existing S3 bucket to the second S3 bucket.
Explanation:
Explanation
Correct Answer: A
Why Option A is correct:
- S3 Cross-Region Replication (CRR) is specifically designed for this exact use case - automatically replicating objects from one S3 bucket to another bucket in a different AWS Region.
- Least operational effort: Once configured, CRR operates automatically without any additional management. New objects uploaded to the source bucket are automatically replicated to the destination bucket.
- Native AWS service: CRR is a built-in S3 feature that requires minimal setup and no custom code.
- Reliable and managed: AWS handles the replication process, including retries and error handling.
Why other options are incorrect:
Option B (CORS configuration):
- CORS is for controlling cross-origin HTTP requests from web browsers, not for data replication between regions.
- Specifying a region in AllowedOrigin doesn't copy data; it only allows web applications from that region to access the bucket.
Option C (Lifecycle rules):
- S3 Lifecycle rules are for transitioning objects between storage classes or expiring objects, not for cross-region replication.
- Lifecycle rules cannot copy objects to buckets in different regions.
- The mention of "across multiple Availability Zones" is irrelevant since S3 buckets are already regionally distributed.
Option D (Lambda function):
- While technically possible, this requires custom code development, testing, deployment, and ongoing maintenance.
- Higher operational effort compared to native CRR.
- Additional costs for Lambda invocations and potential error handling complexity.
- More complex architecture that needs to handle edge cases and failures.
Key AWS Concepts:
- S3 Cross-Region Replication (CRR): Automatically replicates objects across AWS Regions with versioning enabled.
- Use Cases: Compliance requirements, minimizing latency, operational reasons, and disaster recovery.
- Requirements: Both source and destination buckets must have versioning enabled.
- Benefits: Fully managed, automatic, and reliable replication service.
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