What restrictions or risks are associated with using Redis for message exchange between microservices?

When using Redis for message exchange between microservices, the following limitations and risks should be considered:

• Lack of delivery guarantee: Redis Pub/Sub does not store messages; if the subscriber is offline, messages will be lost.
• Scalability: Redis can become a bottleneck with a large number of messages or subscribers.
• Lack of complex routing: Unlike specialized brokers (RabbitMQ, Kafka), Redis does not support complex message routing schemes.
• Limited resilience: In case of Redis failure, all in-memory messages may be lost if persistent storage is not configured.

If reliability and guaranteed message delivery are important, it is better to consider specialized messaging systems.