How Redis Cluster Maintains Availability while Re-Sharding

Hash tags are a way to ensure that multiple keys are allocated in the same hash slot This is used in order to implement multi-key operations in Redis Cluster

CLUSTER DELSLOTS slot Available since: 0; Time complexity: O where N is the total number of hash slot arguments; ACL categories: @admin

redis slot But in this example we'll assume they are just ten, from 0 to 9 ;) Different nodes will hold a subset of hash slots A given key foo is at slot: slot = crc16

redis hash slot A Redis® Cluster is divided into 16384 hash slots, and a deterministic formula is used to derive the key to hash slot mapping, that is [ CRC16(