redis cluster

最新推荐文章于 2025-01-02 19:45:43 发布

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最新推荐文章于 2025-01-02 19:45:43 发布

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本文介绍了RedisCluster的工作原理，特别是其独特的哈希槽分片机制，不同于一致性哈希。通过CRC16校验和对16384取模来确定每个键所属的哈希槽。文中还提供了一个创建包含三个主节点和三个从节点集群的示例。

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Redis Cluster data sharding

Redis Cluster does not use consistent hashing, but a different form of sharding where every key is conceptually part of what we call an hash slot. hash槽

There are 16384 hash slots in Redis Cluster, and to compute what is the hash slot of a given key, we simply take the CRC16 of the key modulo 16384.

./redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 \
127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005

The command used here is create, since we want to create a new cluster. The option --replicas 1 means that we want a slave for every master created. The other arguments are the list of addresses of the instances I want to use to create the new cluster.

Obviously the only setup with our requirements is to create a cluster with 3 masters and 3 slaves.