[Solved] How can you combine Kafka's at-least-once delivery with idempotent processing to avoid duplicates? - Ans: Use unique message IDs and track processed IDs before processing | Kafka

Kafka - Message Delivery Semantics

How can you combine Kafka's at-least-once delivery with idempotent processing to avoid duplicates?

AUse exactly-once delivery mode instead

BDisable retries and rely on auto commit

CProcess messages without tracking and commit offsets early

DUse unique message IDs and track processed IDs before processing

Step-by-Step Solution

Solution:

Step 1: Understand idempotent processing
Idempotent processing means processing a message multiple times has the same effect as once, often done by tracking unique IDs.
Step 2: Combine with at-least-once delivery
Using unique IDs and tracking processed messages avoids duplicates even if messages are delivered multiple times.
Final Answer:
Use unique message IDs and track processed IDs before processing -> Option D
Quick Check:
Idempotent processing + unique IDs prevent duplicates [OK]

Quick Trick: Track unique IDs to make processing idempotent [OK]

Common Mistakes:

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