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The see how Taobao's engineer commented 12306

The first Taobao engineer posting 12306: Once scoffed now, now it is almost a miracle

January 11, January 11 Starting, the 12306 website started to sell train tickets on New Year's Eve. At this time, the only official ticket purchase website 12306 of the railway system will become the target of public criticism. This year is no exception, and 12306 was once again drowned in complaints.
On January 5th, Observer.com published the answer from Wang Qiang, a user on the question and answer website, "If you wrap 12306 to IBM or Alibaba, can you do better than now? "This issue.
On January 10th, a former Taobao engineer named "Code Dog" was later published on an IT industry who was the deputy president of an e -commerce company. He himself thinks of the 12306 system.
The noteworthy is that the "code dog" also had a lot of micro -words when the 12306 system just launched. In order to prove that the 12306 system is easy to build, the "code dog" has even initiated an open source project called "for 12306 design system". Through the practice at work, the "code dog" also has a new understanding of the 12306 system.
Observer reproduced this article for readers' reference.
The full text is as follows:

The page (data chart) when the official booking website 12306 collapses
M my Taobao technical experts, in 2012, as the vice president of an e -commerce company in a top 100 private enterprise, At that time, under the extremely difficult conditions, he led the team to develop a B2C (e -commerce activities carried out by the company -Observer Network Note) to take the Alipay and UnionPay payment channel, with an annual turnover of tens of millions (Author Note: Of course, of course, it is really really true Too little, I just say that this website has invested in actual operations).
At that time, I sneered at 12306, and felt that they did too badly, thinking that I could take the team to spend millions and half a year to make a good one. So I was arrogant to be an open source booking system for them. It took me a week to think about establishing a data model. When I thought about the inventory, I discovered that the inventory complexity of 12306 was many times higher than that of Taobao and JD.com, and the amount of calculations was much larger. The traditional distributed database, cache, and load balancing technology cannot meet the needs of 12306.
In normal times, 12306 is a normal e -commerce website. But as soon as the Golden Week, 12306 is a spike of all products on the whole station, and all SKUs are perverts of dynamic inventory.
Is to realize a 12306, at least at least the minimum hardware investment (author Note: This is an estimated at the time. The difference is large. In short, I am not necessarily right. The business of 12306 may not be as complicated as I said, but it is by no means as simple as some people spray), software and manpower are calculated. Those who clamorize as long as 40 servers, as long as 2 architects and 4 programmers, talk about the division tables and the front -end CDN are just talked about the soldiers on paper. The so -called newborn calves are not afraid of tigers. After three years of CMS and BBS, it is too naive to spray 12306 with this experience.
In media people spray 12306, which is the difficulty behind they do not understand technology, have no ability and patience to analyze the difficulty. The technicians sprayed because most technicians were easily caught in a misunderstanding of too optimistic when thinking in a short time. Classic examples are estimated workloads. Programmers often estimate a ultra -short construction period. The work optimistically imagined as a typist's work to knock on the keyboard.
knows that article, I don't think it is washing the ground. The first and second answers are very objective. Taobao technology is many times stronger than 12306, and Taobao's current system also costs 10 times the money, time, and talents of 12306. The fundamental reason is that the railway capacity cannot meet the needs of the Spring Festival, and Taobao cannot solve this problem.
12306 has made great progress over the past year. From the previous section of the animation verification code, grab the tickets during the time period, to the use of the use of small machines, virtualization, and memory databases to the back end. It can be said that 12306 is the most powerful website (e -commerce system) made by Chinese government agencies. It is almost a miracle to make such a change in just one or two years. Listed companies are not as good as it! (Such as 51job and CTRIP).
The things that have been criticized by 12306 have been criticized on the Internet, and most of them have formed the thinking of [state -owned enterprise = monopoly corruption inefficient]. A small part really despise its difficulty.
. As for the 12306 project, the project of 300 million (including hardware) is expensive. Financial report. Can be found online. It looks like a large number, which really uses a large -scale e -commerce system and search engine system. In fact, it is not a astronomical number.
The explanation, why the pressure of spike is high, and why the dynamic inventory of 12306 is complicated.
The spike first.
Around December 25, 2013, Tmall conducted a Christmas season points exchange activity for several days. At 10:12 am on the 25th, 15,000 Tmall Magic Boxes were released (the Taobao market was sold, about 190-230). From the transaction record, it was all grabbed in 19 seconds.
Actually, I also participated in the second kill. The topic that day was particularly simple (please enter the first letter of the Pinyin of XXX Chinese characters). I should answer the questions within 5 seconds and submit the order. As a result, there are too many people in line, Can't squeeze in, and prompt to retry after 14 seconds. Too many people are because the topic is too simple. The lower the threshold, the more people squeezed in in 5 seconds. There will be no 15,000 people competing with me within 5 minutes.
I I think there is any matter for me after 14 seconds, so I answered the question for a spike, and the page of the server error appeared. Repeat a few times, and tell the spike over.
I asked my colleagues in the group, and less than 10 people answered me and said that they did not arrive in the second (maybe the person who may get a lot of money in seconds and not reply to me).
What is the technical level of Taobao? Taobao has at least 4,000 technical personnel and at least 40,000 servers (these are public data two years ago, you can talk about it according to regulations), the turnover on November 11, 2013 351 351 100 million, the annual turnover of 2012 exceeded 1 trillion.
Taobao has various independent R

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