AWS - CloudWatch
You created an EventBridge rule to trigger a Lambda function on S3 object creation, but the Lambda never runs. What is the most likely cause?
You created an EventBridge rule to trigger a Lambda function on S3 object creation, but the Lambda never runs. What is the most likely cause?
medium📝 Debug Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Check EventBridge and S3 integration
S3 supports EventBridge events for object creation, so integration is possible.Step 2: Verify event pattern correctness
If the event pattern does not correctly specify S3 object creation events, the rule won't trigger the Lambda.Step 3: Consider Lambda region
EventBridge and Lambda must be in the same region; cross-region triggers do not work.Final Answer:
The rule's event pattern does not match S3 object creation events -> Option AQuick Check:
Incorrect event pattern blocks trigger = B [OK]
Quick Trick: Check event pattern matches actual event source and type [OK]
Common Mistakes:
- Assuming Lambda runs without correct event pattern
- Ignoring region mismatch issues
- Believing S3 can't send events to EventBridge
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