Double eleven second kill system. Have you ever snatched it?

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Preface

Some hard goods . Seize the second and kill the goods , You think the e-commerce system （ The programmers behind it ） Will it be so easy for you to succeed ？

Every year, the second sale of commodities on November 11 , A lot of people complain about not getting ： Or finish it in a second , After the ace arrives at the payment page, it will load crazily , After loading, the product is gone . At this time, some people will use some crooked brains —— Let the cattle take the place of , Those who have a little technical foundation can also be self-sufficient , Write a crawler to buy .

Ran goose ！ You can think of , Programmers can also think of .

therefore , Today I would like to introduce Second kill system is how to prevent malicious brush requests or crawler requests . Interested friends , You can click at the end of the text , Understand the implementation mechanism of seckill system .

First , To prevent malicious brush requests or crawler requests , The system will take Verification code mechanism .

But the captcha mechanism is actually very easy to crack , Now it's upgraded to 2.0： Answer mechanism .

The answer mechanism is more difficult to recognize by the machine （ Some questions even I can do wrong ）.

Some friends will find that their accounts are “ black ”, Can't go to a page , Or keep showing frequent operations , The probability is limited by the current limiting mechanism of the platform .

The general way to operate is to control the same IP Access times or control the same user ID, No matter from the same IP The address is still from the same user ID, Will be judged by the system as a malicious request , Don't rush to buy .

The most serious situation is that users will be blocked by the system ID Or directly IP Address , Into the blacklist . This is about the same as ——

harm , So you can't compete with programmers , It's better to squat down and grab the goods ……

Let's talk about the second kill system again .

The second kill system needs more than Prevent malicious brush requests or crawlers , There are still many aspects that need to be maintained . If the second kill system needs to face Instant high concurrency and large traffic Scene 、 Prevent oversold 、 You need to have High performance and stability System 、 Limit the number of units that users can buy etc. , All test the programmer's system architecture ability and coding ability .

therefore , Second kill system project involves many technical points , It's the key point of interview for the first and second tier factories , It is also a technical threshold that must be mastered in the work of large factories .

△ Ali 、 WeChat 、 Bytes to beat 、 Suning has passed the exam

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