I have a Redis deployment acting as a caching layer. The cache is not very big and we would like to read all the items (key/values) at once from our Golang program. The only solution I found is to iterate through all master servers (it is a Redis cluster), execute a Scan to get all the keys and then iterate the keys to get the values.
err := cch.client.ForEachMaster(func(cl *redis.Client) error {
wg.Add(1)
defer wg.Done()
var cursor uint64
var n int
numFor := 0
for {
var keys []string
var err error
keys, cursor, err = cl.Scan(cursor, "*", 10).Result()
if err != nil {
panic(err)
}
n += len(keys)
for _, keyval := range keys {
var cont Content
if err := cch.items.Get(keyval, &cont); err == nil {
} else {
log.Warnf("Error getting Key %s from cache: %s from master %s", keyval, err)
}
}
if cursor == 0 {
break
}
}
return nil
})
wg.Wait()
Is there a better way to do this? Cannot believe I need so many roundtrips to Redis to get the values. Thanks!