[Solved] Which Kafka Streams feature helps achieve exactly-once processing? — Ans: Idempotent producer and transactional writes | Kafka

Kafka - Advanced Stream Processing

Which Kafka Streams feature helps achieve exactly-once processing?

AUsing only one partition per topic

BSimple consumer without commits

CManual offset management without transactions

DIdempotent producer and transactional writes

Step-by-Step Solution

Solution:

Step 1: Identify features supporting exactly-once
Idempotent producer avoids duplicates; transactions group writes atomically.
Step 2: Evaluate options
Only Idempotent producer and transactional writes includes both idempotent producer and transactions needed for exactly-once.
Final Answer:
Idempotent producer and transactional writes -> Option D
Quick Check:
Exactly-once needs idempotent + transactions [OK]

Quick Trick: Idempotent producer + transactions = exactly-once [OK]

Common Mistakes:

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