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redis一般在企业中做分布式缓存，可以大大的减小高并发的开销
企业中一定不是单机版的 因为如果是单机版的有可能会引起宕机
redis集群：两台为一组，一台主机一台备机 ，平时主机工作，备机不工作 ，备机每隔几秒就会给主机发送一个ping ,主机在正常工作的时候会发送一个peng
给备机 ，如果不返回pang，可能会连续ping三次，都不返回那么备机就会上，备机里有主机的全部内容，这个叫做心跳检测机制（高可用的作用），主从热备
redis中的slot槽值得范围是0-16383，一共是16384个槽值，可以将这些槽值分配给每组机器（目前在国内没有达到这么大集群的）
我们在存入redis数据的时候，使用key，value的键值对存值，那么存储前会将key使用crc16算法进行计算，会得出一个纯数字的值，使用这个数字除以16384取余数，余数落到那个slot槽值得范围内就将这个key，value存到对应的机器上，获取数据的时候也是如此。起到了一个负载均衡的作用，集群数越多越均匀，整体的容量要比单机版的容量要大，也就是扩容。
注：宕机就是redis节点挂掉
redis为什么在线上部署的时候一般不设置密码：
图中可以看出客户在访问网址的时候是先进入域名解析器，域名解析器将网址解析成静态的ip，这个静态的ip其实就是负载均衡器（注：负载均衡器是即可以访问内网也可以访问外网），负载均衡器会根据需求来找到对应的项目模块服务器，再由项目模块的服务器找到对应的mysql集群或者是redis集群，tomcat和集群一般都在内网当中，所以不用将redis设置密码。
