谷歌是如何提供结果如此之快？ [英] How does Google serve results so fast?

问题描述

一次又一次，当我搜索在谷歌的话题，
谷歌返回我的结果，也打印出一些统计像

Time and again when I search for a topic on Google, Google returns me the results and also prints out some stats like

1 - 10，共约885万用于J2ME（0.24秒），

"Results 1 - 10 of about 8,850,000 for j2me. (0.24 seconds)"

我注意到，由谷歌服务的结果采取秒处于第二范围内的一小部分。

I notice that the seconds taken by Google to serve the results are in fraction of a second range.

谷歌是如何服务于网页如此之快，它已经在其结束使用什么样的数据库优化技巧？

How does Google serve pages so fast, what kind of database optimization tricks has it used at its end?

推荐答案

我觉得对于前端表现的主要原因是：

I think the main reason for the frontend performance are:

• 每个请求被分配到并行（我是在什么地方读到每个查询命中大约12机），可能是一个单机系列的机器从这些机器收集的响应


• 所有指标数据都在RAM中举行。随着指数的数据，我的意思是术语和词汇的贴子列表索引和在谷歌的情况下，可能很多更多的索引例如拼写更正。即使一个磁盘I / O的某个磁盘的延迟寻求prevents这样的表现。

• Each request is distributed to a series of machines in parallel (I have read somewhere that each query hits around 12 machines), probably a single machines gathers the responses from these machines
• All index data are held in RAM. With index data, I mean the term vocabulary and the postings list index and in the case of Google probably a lot more indexes e.g. for spelling corrections. Even with a single disk I/O somewhere the latency of the disk seek prevents such a performance.

谷歌的Map / Reduce，GFS是后台处理很好的工具，但他们什么都没有做前端的性能。

Googles Map/Reduce, GFS are great tools for background processing, but they have nothing to do with the frontend performance.

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