Twitter的RPC框架Finagle简介



Twitter的RPC框架Finagle简介

Finagle是Twitter基于Netty开发的支持容错的、协议无关的RPC框架,该框架支撑了Twitter的核心服务。来自Twitter的软件工程师Jeff Smick撰文详细描述了该框架的工作原理和使用方式

在Jeff Smick的博客文章中,介绍了Twitter的架构演进历程。Twitter面向服务的架构是由一个庞大的Ruby on Rails应用转化而来的。为了适应这种架构的变化,需要有一个高性能的、支持容错的、协议无关且异步的RPC框架。在面向服务的架构之中,服务会将大多数的时间花费在等待上游服务的响应上,因此使用异步的库能够让服务并发地处理请求,从而充分发挥硬件的潜能。Finagle构建在Netty之上,并不是直接在原生NIO之上构建的,这是因为Netty已经解决了许多Twitter所遇到的问题并提供了干净整洁的API。

Twitter构建在多个开源协议之上,包括HTTP、Thrift、Memcached、MySQL以及Redis。因此,网络栈需要足够灵活,以保证能与这些协议进行交流并且还要具有足够的可扩展性以支持添加新的协议。Netty本身没有与任何特定的协议绑定,对其添加协议支持非常简单,只需创建对应的事件处理器(event handler)即可。这种可扩展性产生了众多社区驱动的协议实现,包括SPDY、PostrgreSQL、WebSockets、IRC以及AWS。


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