Redis 读书笔记

红太狼 2023-05-30 03:38 20阅读 0赞

## 位图 ##

redis的位图可以用来做一些只需要记录非常简单的业务数据，只需要一个0或1就可以标示的数据，可以极大得节省redis存储空间![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDg1NjE1MQ_size_16_color_FFFFFF_t_70]

## HyperLogLog ##

HyperLogLog利用12KB就可以做某个业务的去重计数，并且在数据量没有超过伐值都使用稀疏矩阵，不会占用12KB，其标注误差大概为0.81%，只提供了，添加、统计计数、合并操作  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDg1NjE1MQ_size_16_color_FFFFFF_t_70 1]

## 布隆过滤器 ##

提供不精确的过滤统计，和HyperLogLog的区别是可以知道该业务数据是否存在在过滤器中了，当布隆过滤器说见过这个值，它可能没有真的见过，当它说没见过，那么它一定见过这个值。  
可以通过RedisLabs的JReBloom包来操作布隆过滤器，或者redis的lettuce客户端，支持指令扩展。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDg1NjE1MQ_size_16_color_FFFFFF_t_70 2]

## GeoHash ##

使用Redis记录地图，从而计算点到点的距离。![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDg1NjE1MQ_size_16_color_FFFFFF_t_70 3]

## Redis的通信协议，以及通信数据结构 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDg1NjE1MQ_size_16_color_FFFFFF_t_70 4]  
Redis持久化方式  
Aof和Rdb的区别：Aof主线程写磁盘（I/o），Rdb子进程写磁盘。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDg1NjE1MQ_size_16_color_FFFFFF_t_70 5]

## Redis客户端和服务端的管道通信 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDg1NjE1MQ_size_16_color_FFFFFF_t_70 6]

## Redis pub／sub功能 ##

Stream，Redis的持久化消息队列，pub／sub将被替代  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDg1NjE1MQ_size_16_color_FFFFFF_t_70 7]  
![在这里插入图片描述][20191106235023928.png]  
Redis主从同步方式  
快照同步和增量同步，增量同步的Buffer区是一个环形区，如果数据修改的速度大于主从同步的速度，buffer区未被同步的数据会被覆盖，丢失数据。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDg1NjE1MQ_size_16_color_FFFFFF_t_70 8]

## 哨兵监控主从节点 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDg1NjE1MQ_size_16_color_FFFFFF_t_70 9]

## Redis过期策略![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDg1NjE1MQ_size_16_color_FFFFFF_t_70 10] ##

## Key淘汰策略 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDg1NjE1MQ_size_16_color_FFFFFF_t_70 11]  
内容来着《redis 深度历险》

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[20191106235023928.png]: https://img-blog.csdnimg.cn/20191106235023928.png
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