Does rueidis support fetching multiple keys across different slots without client side cacheing enabled?

[lchalabi]

Does rueidis support fetching multiple keys across different slots with MGET without client side cacheing enabled? I see the helper rueidis.MGetCache which leverages cmds.MGets to group keys by their slot and return multi MGET commands. However, it's not clear to me whether this is supported without client side cacheing. Thank you!

[rueian]

Hi @lchalabi,

rueidis.MGet helper has been added to v0.0.94. You can now use it to fetch multiple keys across different slots with MGET without client side caching.

[rueian]

Hi @lchalabi,

Currently, there is no similar utilities for MSET and MSETNX.

Alternatively, I would recommend using normal SET instead. It is actually more powerful than MSET with the ability to setting options such as EX, PX, NX and XX.

You can either simply use multiple goroutines to send SET commends with client.Do() at the same time or pre-construct them first and then use client.DoMulti() at once, for example:

cmds := make(rueidis.Commands, 0, 10)
for i := 0; i < 10; i++ {
    cmds = append(cmds, client.B().Set().Key("key").Value("value").Build())
}
for _, resp := range client.DoMulti(ctx, cmds...) {
    if err := resp.Error(); err != nil {
        panic(err)
    }
}

[lchalabi]

Thank you @rueian!

[rueian]

Hi @lchalabi, we have MSet and MSetNX helpers now!

[lchalabi]

Great! would this allow us to better optimize the distribution of data across slots? Perhaps optimizing to store data in the fewer slots to reduce the number of MGETs needed on the read path? We're currently seeing elevated CPU due the high number of MGETs needed to read batched data from our cluster.

[rueian]

To reduce slots required by your keys, you need to specify slot mapping with {xxx} in your keys.