[Solved] How can you ensure a Lambda function triggered by an S3 event only processes .png files? — Ans: Add a filter rule on the S3 event notification for suffix '.png' | AWS

AWS - Lambda

How can you ensure a Lambda function triggered by an S3 event only processes .png files?

ACheck file extension inside the Lambda code and ignore others

BAdd a filter rule on the S3 event notification for suffix '.png'

CConfigure Lambda to only run on .png files in the runtime settings

DSet S3 bucket policy to allow only .png files

Step-by-Step Solution

Solution:

Step 1: Use S3 event notification filters
S3 event notifications support filter rules to trigger Lambda only for specific object key suffixes like '.png'.
Step 2: Compare with other options
Filtering inside Lambda wastes resources; runtime settings do not filter events; bucket policy controls access, not triggers.
Final Answer:
Add a filter rule on the S3 event notification for suffix '.png' -> Option B
Quick Check:
S3 event filters control Lambda triggers by file suffix [OK]

Quick Trick: Use S3 event filters to trigger Lambda only on desired file types [OK]

Common Mistakes:

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How can you ensure a Lambda function triggered by an S3 event only processes .png files?