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I have one redis node already, now the momery is cost much and i want to migrate this to more instance. if i load the rdb in every instance, it must be waste a lot.
I can use “keys ” to get all key, and then sharding the data by performing a consistent hash upon the key, but it is very ugly…Any beatiful solution?
If you had redis running in with AOF configured you could simply write a script that reads the AOF. That’s what we did. With redis in RDB configuration i don’t think you can do that.
If you’re running redis 2.6 you could use the migrate command:
http://redis.io/commands/migrate
You would still need to iterate over the keys with
KEYS.I don’t think there is a better solution that iterating over all keys with
KEYSand then consistently hash them.If you’re not afraid of communicating with redis directly you could process the bulk reply of
KEYS *while reading it, to speed things up and save memory.