[Solved] Why does this Kafka Streams app fail to achieve exactly-once?props.put("processing.... Why does this Kafka Streams app fail to achieve exactly-once?props.put("processing.guarantee", "exactly_once"); | Kafka

Kafka - Advanced Stream Processing

Why does this Kafka Streams app fail to achieve exactly-once?

props.put("processing.guarantee", "exactly_once");
props.put("enable.idempotence", "true");
// Missing transaction timeout setting
streams.start();

Aenable.idempotence must be false for exactly-once

BMissing transaction timeout can cause transaction failures

Cprocessing.guarantee should be at_least_once

DNo input topic specified causes failure

Step-by-Step Solution

Solution:

Step 1: Understand transaction timeout role
Transaction timeout prevents long-running transactions from failing unexpectedly.
Step 2: Effect of missing timeout
Without timeout, transactions may fail, breaking exactly-once guarantees.
Final Answer:
Missing transaction timeout can cause transaction failures -> Option B
Quick Check:
Transaction timeout needed to avoid failures [OK]

Quick Trick: Set transaction timeout to avoid failures [OK]

Common Mistakes:

MISTAKES

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