redis高可用架构

Redis的高可用架构有多种选择。其中一种是使用keepalived和redis来实现高可用。keepalived是一个常用的高可用方案，通过监控主节点和备节点的状态，当主节点宕机时，keepalived会自动将备节点切换为主节点。另一种是使用Redis Cluster。Redis Cluster是在Redis 3.0版本中引入的，它能够实现分布式高可用和负载均衡。Redis Cluster通过节点取模分区的方式来分布数据，并使用CRC32 hash算法将请求的key分发到对应的槽点。同时，槽位间的信息也会同步给coordinator进行管理。这种架构的优点是可以实现分布式高可用和负载均衡，但缺点是增加了proxy作为中转层，可能会导致网络开销和性能降低。可以通过增加proxy数量来减少性能损耗。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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