[Solved] Which scenario best describes when a message should be sent to a Dead Letter Queue in Kafka? — Ans: When the message format is invalid and cannot be parsed. | Kafka

Kafka - Event-Driven Architecture

Which scenario best describes when a message should be sent to a Dead Letter Queue in Kafka?

AWhen the message is older than a certain timestamp.

BWhen the message is successfully processed.

CWhen the message is consumed multiple times without error.

DWhen the message format is invalid and cannot be parsed.

Step-by-Step Solution

Solution:

Step 1: Identify error conditions for DLQ usage
Messages that cannot be processed due to format errors or other failures are candidates for DLQ to avoid blocking the main topic.
Step 2: Eliminate non-error scenarios
Successful processing or repeated consumption without error does not require DLQ. Age alone is not a reason for DLQ.
Final Answer:
When the message format is invalid and cannot be parsed. -> Option D
Quick Check:
DLQ triggers on processing errors = true [OK]

Quick Trick: Send only unprocessable messages to DLQ [OK]

Common Mistakes:

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Which scenario best describes when a message should be sent to a Dead Letter Queue in Kafka?