Shulou(Shulou.com)06/03 Report--

Why does 12306 often collapse? According to the statistics of China National Railway Group Co., Ltd., the annual ticket sales of the railway system has exceeded 3.1 billion, with a daily ticket sales capacity of 15 million, with a peak of 700 tickets per second and more than 150 billion page views per day. Internet ticket sales account for 82.8% of the total railway ticket sales. 12306 has become the largest real-time ticketing trading system in the world. Access to such a large amount of data, as well as the instantaneous number of orders submitted, and the high number of concurrent orders will cause the server to fail to function properly. If more visits and requests keep coming in at this time, the server will crash. Corresponding examples, there are double 11, double 12 and other shopping festivals, people in the early morning rush into the shopping platform, there will be similar problems. Why does a high concurrency easily lead to a server crash? The server is a queuing mechanism for requests, and when the load is low, everyone will not feel pressure, because it has been processed in 1 second. When the number of requests is too large, when we visit 12306, we feel that the page loads slowly and the route is slower to query. Because there are too many requests, the server cannot handle so many requests, and it will discard some requests. If there is a sudden influx of traffic at this time, the operating system TCP protocol stack will also start to drop requests, and what we see is that the server network cannot be linked. If you continue to increase the number of requests and the hardware is running at full capacity, there will eventually be a large area of inaccessibility, which will lead to the "collapse of 12306" at the beginning. To put it another way, such as highways, sites like 12306, we usually use 8 lanes, 16 lanes and so on, superhighways. Usually, it is easy to pass 8 cars and 16 cars a second at a highway entrance. But what happened during the Spring Festival? Every second, we need to make sure that the number of vehicles that can pass is 8 times, and that this n is increasing. Then the pressure on the highway is rising, and at this time, there is a sudden influx of a large number of cars at a highway intersection, the highway will be immediately congested, or even unable to drive. This is very similar to using 12306 to buy tickets. We usually have no problem with buying tickets, but during the Spring Festival, there are a large number of people who buy tickets. When tickets are released on a popular train line, the crowd will burst into the network, which is already a little unbearable. As far as enterprises are concerned, how to solve the problem of website traffic surge? There will be a surge in traffic not only in 12306, but also in many corporate websites when they carry out activities, such as shopping festivals such as double 11 and double 12, or the promotion of products on the website, the release of new products, and so on. In the face of the surge of traffic, in addition to the affirmation of the effect of the activity, we should also take emergency measures in advance, otherwise once the surge of traffic users can not get the ideal experience, it will be counterproductive for enterprises. In the face of skyrocketing traffic, Cloudeasy Cloud Manager's CDN acceleration, server load balancing, cloud database and so on, can give users a better website experience to a certain extent. However, when the website operation to a certain stage, server configuration upgrade is still the main means, good configuration can make the website run more smoothly, but also allows enterprises to show better products and services.

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