How Redis Cluster Maintains Availability while Re-Sharding

How Redis Cluster Maintains Availability while Re-Sharding redis hash slot Returns the number of keys in the specified Redis Cluster hash slot The command only queries the local data set, so contacting a node that is not serving redisexceptionsresponseerror_ crossslot keys in request don''t hash to the same slot シャーディング Redis Cluster はクラスタ全体で16384個のhash slotをもちます。各ノードにhash slotの一部分が

redisexceptionsresponseerror_ crossslot keys in request don''t hash to the same slot There are 16384 hash slots in KeyDB Cluster, and to compute what is the hash slot of a given key, we simply take the CRC16 of the key modulo 16384 Every node

redis slot Effectively, the “key-set” of our HASH is our “set” data structure Our strategy results in a view of the HASH like this: redisHashKey: { valueToStore1: 1, One shard can contain many hash slots, and a hash slot contains many keys The total number of hash slots in a database is always 16384