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A developer tries to use Redis Pub/Sub to guarantee message delivery to offline clients. What is the main issue?

medium📝 Debug Q6 of 15
Kafka - Basics and Event Streaming
A developer tries to use Redis Pub/Sub to guarantee message delivery to offline clients. What is the main issue?
ARedis Pub/Sub stores messages for offline clients
BRedis Pub/Sub automatically retries delivery
CRedis Pub/Sub queues messages for offline clients
DRedis Pub/Sub does not support message persistence
Step-by-Step Solution
Solution:

  1. Step 1: Analyze Redis Pub/Sub delivery model

    Redis Pub/Sub delivers messages only to connected clients, no persistence.

  2. Step 2: Identify problem with offline clients

    Offline clients miss messages because Redis Pub/Sub does not store or queue messages.

  3. Final Answer:

    Redis Pub/Sub does not support message persistence -> Option D

  4. Quick Check:

    Redis Pub/Sub lacks persistence = B [OK]
Quick Trick: Redis Pub/Sub has no message persistence [OK]
Common Mistakes:
  • Assuming Redis queues messages
  • Thinking offline delivery is supported
  • Confusing with Redis Streams

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