How to scale Redis?

Question

I have a single instance Redis deployment, and my application uses multiple databases within that deployment.

I would like to scale it up, however, the issue is, RedisCluster does not support multiple databases. What are my best options?

Answer 1

You've only two options:

1. You refactor your application layer to use sharding (ie Redis Cluster ).
2. You use regular master-slave replication to load balance your Redis work load.

Answer 2

Actually, IIUC, you have another option (besides the two that @Matias put) - stop using shared databases and, instead, spin up a dedicated Redis server process for each database.

If your server has more than 2 CPU cores, this will allow you to utilize them better. In your application(s) code, replace calls to SELECT with a connection to the relevant Redis server.