AWS DVA-C02 Drill: S3 Object Lambda - Dynamic PII Redaction

Jeff’s Note

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Unlike generic exam dumps, ADH analyzes this scenario through the lens of a Real-World Lead Developer.

For AWS DVA-C02 candidates, the confusion often lies in how to serve different versions of an object dynamically without duplicating data. In production, this boils down to understanding exactly how S3 Object Lambda enables transformation of objects on-the-fly during GET requests without modifying the underlining data. Let’s drill down.

The Certification Drill (Simulated Question)

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Scenario

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Bluefin Analytics, a financial software provider, must retain original customer transaction records for 10 years to comply with strict audit regulations. Each record contains sensitive personally identifiable information (PII). Internal compliance staff can access full records, but external research partners only get sanitized versions stripped of all PII. Bluefin wants to store one immutable copy of each record in Amazon S3. Depending on the user’s permissions, either the original record or a redacted version with PII removed should be returned. A lead developer has created an AWS Lambda function named redactPII that removes PII on demand.

The Requirement:

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How should Bluefin implement access to dynamically return either the original or redacted document without creating multiple object copies?

The Options

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• A) Configure an S3 event notification to trigger redactPII on every S3 GET request. Use the GET API to retrieve the PII-free object.
• B) Configure an S3 event notification that triggers redactPII upon PUT requests. Use PUT to access the redacted copy.
• C) Create an S3 Object Lambda access point selecting the redactPII Lambda function. Use this Access Point to retrieve redacted objects.
• D) Create an S3 Access Point and call the GetObjectLegalHold API passing redactPII as a parameter to retrieve redacted content.

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Correct Answer

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C

Quick Insight: The Developer Imperative

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To dynamically transform S3 objects during GET without altering the original or creating duplicates, S3 Object Lambda Access Points are the built-in AWS mechanism to invoke Lambda functions on-the-fly when retrieving objects. Other event notifications or API calls do not support this dynamic transformation on GET requests.

Content Locked: The Expert Analysis

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You’ve identified the answer. But do you know the implementation details that separate a Junior from a Senior?

The Expert’s Analysis

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Correct Answer

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Option C

The Winning Logic

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S3 Object Lambda Access Points let you transparently alter data returned by GetObject API calls using Lambda functions like redactPII. You create a dedicated Object Lambda Access Point with your Lambda function attached. When users retrieve objects through this access point, the function executes on the object data stream, returning transformed (PII-redacted) content without modifying or replicating the original S3 object. This perfectly fulfills the requirement of one immutable source with dynamic views based on access permissions.

Key details:

• Lambda triggers during GetObject via Object Lambda access point.
• No need to create or maintain sanitized object copies or secondary buckets.
• Supports granular access with IAM to the original S3 bucket vs the Object Lambda Access Point.

The Trap (Distractor Analysis):

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• Why not A?
  S3 event notifications cannot trigger Lambda on GET requests. They only trigger on PUT, POST, DELETE, or COPY events. Can’t run on every retrieval.

• Why not B?
  PUT requests store data; they don’t serve data or transform it dynamically. The question is about retrieving sanitized data without multiple copies.

• Why not D?
  GetObjectLegalHold API manages legal hold states on objects, not content transformation or redaction. Passing a Lambda function name here is not supported.

The Technical Blueprint

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# Sample AWS CLI command to get an object via an S3 Object Lambda Access Point
aws s3control get-object-lambda-configuration \
    --name redact-pii-alap \
    --account-id 123456789012

# To get the object through the Object Lambda Access Point
aws s3api get-object \
    --bucket arn:aws:s3-object-lambda:us-east-1:123456789012:accesspoint/redact-pii-alap \
    --key original-record.json output.json

The Comparative Analysis

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Real-World Application (Practitioner Insight)

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Exam Rule

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When you see a requirement to modify or filter S3 GET responses dynamically without creating copies, always look for S3 Object Lambda Access Points.

Real World

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In actual production systems, you might combine S3 Object Lambda with IAM policies and CloudTrail logging to enforce strict PII access controls and auditing, leveraging dynamic Lambda code updates for evolving compliance requirements.

(CTA) Stop Guessing, Start Mastering

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Disclaimer

This is a study note based on simulated scenarios for the AWS DVA-C02 exam.