Draft: Patch mget in Redis::Cluster for cross-slot safety and efficiency

redis crossslot keys in request don't hash to the same slot   Dan redis hash slot

Hash tags are used to guarantee that certain keys are placed in the same hash slot, read more about hash tags in the redis cluster tutorial

This error message indicates that some of the keys in your request are mapped to different hash slots, which is preventing the operation from being executed  This error message indicates that some of the keys in your request are mapped to different hash slots, which is preventing the operation from being executed

49ers slot receiver $ redis-cli -p 30001 -c :30001> MSET one 1 two 2 three 3 CROSSSLOT Keys in request don't hash to the same slot To solve this problem “CROSSSLOT Keys in request don't hash to the same slot ” As per Redis guidelines: When in cluster mode, Redis do not