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更新 Redis扩展部分.md

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Redis扩展部分.md
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@ -12,7 +12,7 @@
​ 分布式锁的核心思想就是让大家都使用同一把锁，只要大家使用的是同一把锁，那么我们就能锁住线程，不让线程进行，让程序串行执行，这就是分布式锁的核心思路
![image-20231007214715309](https://oss-wxin-resource.oss-cn-beijing.aliyuncs.com/%E5%9B%BE%E7%89%87/Redis/1.png?Expires=1723640177&OSSAccessKeyId=TMP.3KfeJz2GfydC5m533sXWc3x8M2AoBTEmroU3YwdYX4zeccmetAxNCv2ZYhrhNTFVWP6fUHFL3tEbZ2xPoj72x22vyq3ANJ&Signature=RGr6kkgB91djekjb4fo%2F87cZC%2Bo%3D)
![image-20231007214715309](https://oss-wxin-resource.oss-cn-beijing.aliyuncs.com/%E5%9B%BE%E7%89%87/Redis/1.png)
#### 2.分布式锁满足的条件
@ -26,7 +26,7 @@
安全性：安全也是程序中必不可少的一环
![image-20231007215001368](https://oss-wxin-resource.oss-cn-beijing.aliyuncs.com/%E5%9B%BE%E7%89%87/Redis/2.png?Expires=1723640261&OSSAccessKeyId=TMP.3KfeJz2GfydC5m533sXWc3x8M2AoBTEmroU3YwdYX4zeccmetAxNCv2ZYhrhNTFVWP6fUHFL3tEbZ2xPoj72x22vyq3ANJ&Signature=2rF7nCnjr4rZfgUiK6CgIekpLng%3D)
![image-20231007215001368](https://oss-wxin-resource.oss-cn-beijing.aliyuncs.com/%E5%9B%BE%E7%89%87/Redis/2.png)
#### 3.常见的分布式锁
@ -36,7 +36,7 @@ Redis：作为分布式锁是非常常见的一种使用方式，现在企业级
Zookeeper：也是企业级开发中较好的一个实现分布式锁的方案
![image-20231007215146879](https://oss-wxin-resource.oss-cn-beijing.aliyuncs.com/%E5%9B%BE%E7%89%87/Redis/3.png?Expires=1723640278&OSSAccessKeyId=TMP.3KfeJz2GfydC5m533sXWc3x8M2AoBTEmroU3YwdYX4zeccmetAxNCv2ZYhrhNTFVWP6fUHFL3tEbZ2xPoj72x22vyq3ANJ&Signature=28Xrz%2B08cCuUZhrAzG0dogX5J0c%3D)
![image-20231007215146879](https://oss-wxin-resource.oss-cn-beijing.aliyuncs.com/%E5%9B%BE%E7%89%87/Redis/3.png)
#### 3.设置分布式锁
@ -67,11 +67,11 @@ Zookeeper：也是企业级开发中较好的一个实现分布式锁的方案
​ 我们利用redis 的setNx方法，当有多个线程进入时，我们就利用该方法，第一个线程进入时，redis 中就有这个key 了，返回了1，如果结果是1，则表示他抢到了锁，那么他去执行业务，然后再删除锁，退出锁逻辑，没有抢到锁的，等待一定时间后重试即可
<img src="https://oss-wxin-resource.oss-cn-beijing.aliyuncs.com/%E5%9B%BE%E7%89%87/Redis/4.png?Expires=1723640311&OSSAccessKeyId=TMP.3KfeJz2GfydC5m533sXWc3x8M2AoBTEmroU3YwdYX4zeccmetAxNCv2ZYhrhNTFVWP6fUHFL3tEbZ2xPoj72x22vyq3ANJ&Signature=3WWhbZv%2BNWLggrOWyyqsN78zZsw%3D" alt="image-20231007220404622" style="zoom:50%;" />
<img src="https://oss-wxin-resource.oss-cn-beijing.aliyuncs.com/%E5%9B%BE%E7%89%87/Redis/4.png" alt="image-20231007220404622" style="zoom:50%;" />
#### 6.锁的基本接口
<img src="https://oss-wxin-resource.oss-cn-beijing.aliyuncs.com/%E5%9B%BE%E7%89%87/Redis/5.png?Expires=1723640334&OSSAccessKeyId=TMP.3KfeJz2GfydC5m533sXWc3x8M2AoBTEmroU3YwdYX4zeccmetAxNCv2ZYhrhNTFVWP6fUHFL3tEbZ2xPoj72x22vyq3ANJ&Signature=P8l0%2FqG6OMtX%2BWtEn3Qu287RUQQ%3D" alt="image-20231007220504083" style="zoom:50%;" />
<img src="https://oss-wxin-resource.oss-cn-beijing.aliyuncs.com/%E5%9B%BE%E7%89%87/Redis/5.png" alt="image-20231007220504083" style="zoom:50%;" />
## 二：Redis故障的排查思路