Hystrix入门与分析(二):依赖隔离之线程池隔离 - nick hao - 博客园



Hystrix入门与分析(二):依赖隔离之线程池隔离 - nick hao - 博客园

依赖隔离是Hystrix的核心目的。依赖隔离其实就是资源隔离,把对依赖使用的资源隔离起来,统一控制和调度。那为什么需要把资源隔离起来呢?主要有以下几点:

1.合理分配资源,把给资源分配的控制权交给用户,某一个依赖的故障不会影响到其他的依赖调用,访问资源也不受影响。

2.可以方便的指定调用策略,比如超时异常,熔断处理。

3.对依赖限制资源也是对下游依赖起到一个保护作用,避免大量的并发请求在依赖服务有问题的时候造成依赖服务瘫痪或者更糟的雪崩效应。

4.对依赖调用进行封装有利于对调用的监控和分析,类似于hystrix-dashboard的使用。

 

Hystrix提供了两种依赖隔离方式:线程池隔离 和 信号量隔离。如下图,线程池隔离,Hystrix可以为每一个依赖建立一个线程池,使之和其他依赖的使用资源隔离,同时限制他们的并发访问和阻塞扩张。每个依赖可以根据权重分配资源(这里主要是线程),每一部分的依赖出现了问题,也不会影响其他依赖的使用资源。


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