zookeeper详解（四）

左手的ㄟ右手 2022-12-25 14:50 103阅读 0赞

# zookeeper实战 #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70][]

## 一、服务注册与发现 ##

其实就是一个注册信息，一个发现信息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70 1][]

zk服务注册与发现思路：

产品服务 ： 三台服务器写入zk节点中（使用临时顺序节点）存储的信息是对应服务的ip和端口

订单服务 ： 一台服务器启动获取zk节点，并且监听节点变换情况。（其中获取三个节点后，可以自己写一个负载函数，指定访问哪台服务，可以是轮询，hash，随机）

**产品服务部分代码**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70 3][]

**订单服务部分代码**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70 4][]

负载算法-简单随机

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70 5][]

## 二、分布式锁 ##

synchronize 和 lock 的区别 ===》lock功能更强大

锁的生命周期

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70 6][]

模拟并发请求

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70 7][]

实现lock中的 tryLock

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70 8][]

实现lock中的 waitLock

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70 9][]

实现lock中的unLock

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70 10][]

## 三、集群选举 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70 11][]

集群选举，其实也是使用了zk的临时节点和监听的性质。

思路：服务器项目一启动，去创建临时节点，并监听改节点。节点创建成功的，成为主节点。节点创建失败的，成为从节点。

这个时候 =》主节点挂掉了，其他从节点监听到节点变换，重新进行选举（创建节点），总有一个从服务器是创建成功的，所以选举成功。

## 四、数据库动态配置 ##

spring集成mybatis，修改zk数据库配置，实现动态修改数据库源。

思路：通过修改zk节点，项目监听节点变化，更新mybatis数据源类，实现数据库动态配置。

监听zk节点变换

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70 12][]

更新数据源方法===》实现DataSource接口，重写该接口。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4Mzc3MTkw_size_16_color_FFFFFF_t_70 13][]

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