Get values by array of keys from redis cluster in nodejs

Question

I am trying to get values by keys array from redis cluster in nodejs, and it returns error: "All keys in the pipeline should belong to the same slot" this is code:

    private GETALL_P(keys: string[], cb: any) {

    var pipeline = this.client.pipeline();

    keys.forEach(function (key: string, index: Number) {
        pipeline.get(key);
    });

    pipeline.exec(function (err: any, result: any) {
        cb(err, result);
    });
}

I searched and someone said: it is not working with cluster. Is there any way to do this?

Chris Tanner · Accepted Answer · 2016-10-06 14:09:13Z

1

Multi key operations on a redis cluster need to be on the same node, which is what the error is complaining about.

To force all the required keys to the same node you can use key hash tags, just bear in mind that if you are doing this for all keys and not just some subset then you're making the use of a cluster fairly pointless.

edited Oct 6, 2016 at 14:09

answered Oct 6, 2016 at 13:11

Chris Tanner

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3 Comments

vakho papidze Over a year ago

Thanks for response. Problem is that data already is saved in redis by different service. I only read that data.

Chris Tanner Over a year ago

Do you have to use a pipeline? Non-pipelined should work fine, it'll just be slower.

vakho papidze Over a year ago

yes that error happens when i use pipeline, but non-pipelined throws this error "ERR EXEC without MULTI" . --> redis.multi({ pipeline: false });

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