proposal: split commands for cluster mode

[Eywek]

Hello,

At my job, we want to use Redis Cluster in our production environment (for scaling purpose) but we've hit some limitations with ioredis. Indeed, we're using multi and mget commands with multiple keys (not in the same slot ofc), so we're wondering if ioredis can't do some command splitting (like https://github.com/eleme/corvus#commands for example) to send the right command to the right node.

We're not using corvus to avoid deploying a new service and because it don't support streams commands or pubsub.

Thanks

[luin]

I'm wondering why do you use multi in the cluster setup when the commands inside it belong to different slots? ioredis will distribute commands to the correct node as long as pipeline & multi are not used.

[Eywek]

We were using multi before the requirement of using Redis Cluster, and sometimes we send a large amount of commands to the redis instance so multi is useful.

So, if I use a command like mget with multiple keys (not in the same slot), ioredis will distribute commands to the correct node for each key?

[luin]

@Eywek Aha, I got the point. Indeed the commands with keys belonging to different slots will not work (e.g. mget) with Redis.Cluster. We may have another class for that feature to avoid breaking backward compatibility.

[cocobiz]

@luin Hi master, what's the road map about this feature? has any schedules?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed after 7 days if no further activity occurs, but feel free to re-open a closed issue if needed.

[luin]

@cocobiz Pull request is welcome currently.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed after 7 days if no further activity occurs, but feel free to re-open a closed issue if needed.

[dineshS-dentsu]

How to overide RedisCache if it fails to connect to the server ?