redis hash 槽

Redis的Hash槽是指一个数组，数组范围是从0到2^14-1，用来存储Redis集群中的数据。Hash槽会被均匀地分配给Redis节点，每个节点负责存储一定数量的Hash槽的数据。例如，节点1负责存储编号0号至5460号的Hash槽，节点2负责存储编号5461号至10922号的Hash槽，节点3负责存储编号10923号至16383号的Hash槽。当需要在Redis集群中存放一个key-value时，Redis会使用crc16算法对key进行哈希取值，并将结果对16384求余数得到该key对应的Hash槽编号。根据节点数量，Redis会将Hash槽大致均等地映射到不同的节点上。这样，每个key都对应一个在0-16383之间的Hash槽编号。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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