DynamoDB - with Serverless
Why is it important to handle retries and idempotency in Lambda functions triggered by DynamoDB Streams?
Why is it important to handle retries and idempotency in Lambda functions triggered by DynamoDB Streams?
hard🧠 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand event delivery guarantees
DynamoDB Streams may deliver the same event multiple times (at-least-once delivery).Step 2: Importance of idempotency
To avoid duplicate effects, Lambda functions must handle retries safely (idempotent).Final Answer:
Because stream events can be delivered more than once, causing duplicate processing -> Option DQuick Check:
Handle retries due to possible duplicate events [OK]
Quick Trick: Design Lambda to be idempotent for repeated stream events [OK]
Common Mistakes:
MISTAKES- Assuming single delivery of events
- Believing Lambda always fails initially
- Thinking Streams delete events immediately
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