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How do you check which modules are currently loaded on a running Redis instance, and how do you load a new module? What is Redis Stack, and how does it relate to the individual Redis modules? What licensing considerations should you be aware of when using Redis modules in a commercial product? How would you evaluate whether to use a Redis module for a specific feature versus implementing similar functionality using Redis's core data types directly?
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How do Redis modules interact with Redis Cluster, and what considerations apply when using modules in a sharded, distributed environment?

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Answer

Modules must be specifically designed to be cluster aware to function correctly across a sharded Redis Cluster, and while many popular official modules do support cluster mode, some module features may behave differently or have limitations when data is distributed across multiple nodes rather than existing on a single instance, so it is important to verify a specific module's cluster support before relying on it in a sharded deployment.
-- Confirm cluster support before deploying a module
-- across a sharded Redis Cluster environment
MODULE LIST
Real-world example A team planning to use RedisSearch across a sharded Redis Cluster carefully reviews the module's documentation for cluster specific behavior and limitations before finalizing their architecture, avoiding an unpleasant surprise after deployment.

Common follow-ups: Which official Redis modules currently have full support for Redis Cluster?;What specific features might behave differently in a clustered environment compared to a single instance?

Clustering;Cluster Sharding & Hash Slots
All 7 Redis Modules Overview questions