Balancing read-only scripts between replicas in non-cluster mode

[tamasgyenese]

Hi All!

I have a Redis [7.1.0] cache setup in non-cluster mode with 1 primary and 4 replica nodes. I was wondering is there any good way to execute read-only script on replicas, because currently every script execution targets the primary node and would be great to be able to execute those scripts on replicas.
I've seen the ClusterCommandExecutor supports this and also I use it in my cluster setup. Is there any workaround to achieve the same in non-cluster mode?
Thank you!

[ggivo]

@tamasgyenese

A brief look at the code shows that ClusterCommandExecutor#executeCommandToReplica() will run the command on arbitrary replica. In your current use case, is that what you are targeting for, or do you need your script to be run on all replica nodes?

There is no out-of-the-box solution for the Master-Replica setup similar to ClusterCommandExecutor#executeCommandToReplica().
The workaround would be to develop a custom solution using a dedicated Jedis client connected directly to the replica nodes.

This sounds like a possible improvement in Jedis. Some sort of utility that is capable of reading the Master-Replica topology from seed nodes and providing API for triggering command toward master/replica nodes.

[tamasgyenese]

Hi @ggivo

Thank you for your answer. I don't want to execute the read-only script on all replica nodes, just would lile to reduce the traffic on the primary node. Maybe having a separated connection pool for primary and replica nodes could work or better/easier idea to scale up the primary node?

Thank you!

[ggivo]

@tamasgyenese
Yes, this looks like a viable option.