名字来自于 Scalable Web Architecture and Distributed Systems。本文是一个简单版的笔记，主要是想推荐这套书籍 The Architecture of Open Source Applications。第一和第二册讲一些开源系统的设计，第三册讲性能相关，第四次每一章都用 500 行左右的代码实现一个小型的系统。现在正在出第五册。
推荐这本书的理由很简单：

没吃过猪肉，但总见过猪跑，其中见过猪跑很重要。

另外最近从我们组一哥们那学到了很多东西，觉得见识真是一个很神奇的事情，只有见过大场面，经历过大场面，那么才有更大的可能创造大场面。
下面是看这篇文章之后记录下来的一些点，有些东西不仅仅在 Web 系统中有用，在所有的分布式系统中都有用处。
Some key principles that influence the design of large-scale web systems

• Availiability: The uptime of a website is absolutely critical to the reputation and functionality of many companies.
• Performance: Website performance has become an important consideration for most sites.
• Reliability: A system needs to be reliable, such that a request for data will consistently return the same data
• Scalability: When it comes to any large distributed system, size is just one aspect of scale that needs to be considered.
• Manageability: Designing a system that is easy to operate is another important consideration.
• Cost: Cost is an important factor. Cost is the total cost of ownership
  When it comes to system architecture there are a few things to consider:
• What are the right pieces
• How these pieces fit together
• What are the trade-offs
  Some core factors that are central to almost all large web applications
• services
• redundancy
• partitions
  • data locality
  • inconsistency
• handling failure
  Some options can make access data fast:
• cache
• proxy(squid, varnish)
• index
• load balancer(HAProxy)
  • challenges: how to manage user-session-specific data
• queue
  

  Linkage

  如果微信把链接给吞了，那就复制下面 URL 打开即可
  Scalable Web Architecture and Distributed Systems : http://aosabook.org/en/distsys.html
  The Architecture of Open Source Applications : http://aosabook.org/en/index.html