dubbo集群容错策略和负载均衡策略

痛定思痛。 2023-10-11 11:42 41阅读 0赞

## 1 dubbo的集群容错策略和负载均衡策略来自配置  ##

如下图所示：

## ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA_size_16_color_FFFFFF_t_70][] ##

## 2. 集群策略 ##

如下图所示：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA_size_16_color_FFFFFF_t_70 1][]

> 集群容错策略包括：
> 
> 1)  failfast  快速失败（失败后直接抛异常结束）
> 
> 1）failover 失败后重试
> 
> 3) failsafe  安全失败  
> 
> 4) failback

failfast![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA_size_16_color_FFFFFF_t_70 2][]

failover

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA_size_16_color_FFFFFF_t_70 3][] failsafe

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA_size_16_color_FFFFFF_t_70 4][]

failback

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA_size_16_color_FFFFFF_t_70 5][]

## 3 负载均衡策略 ##

## ![20190923102013418.png][] ##

>  1） 随机
> 
> 2） 轮询
> 
> 3） 最少负载
> 
> 4） 一致性哈希

3.1 随机

return (Invoker)invokers.get(ThreadLocalRandom.current().nextInt(length));
    
    // 随机获取totalWeight以内的一个整数

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA_size_16_color_FFFFFF_t_70 6][]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20190923102001883.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20190923140646601.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20190923140744610.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20190923140849761.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20190923141012401.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA=,size_16,color_FFFFFF,t_70
[20190923102013418.png]: https://img-blog.csdnimg.cn/20190923102013418.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA_size_16_color_FFFFFF_t_70 6]: https://img-blog.csdnimg.cn/20190923102928564.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA2Mjc4NDA=,size_16,color_FFFFFF,t_70