Redis application example sharing: Online mall flash sale system design

With the development of the Internet, more and more companies are choosing to transform online. A major trend in online shopping malls is to launch flash sales activities to attract more customers. However, a good flash sale system needs to consider many aspects, such as how to ensure system stability and rapid response, and how to prevent overselling, wrong buying and other problems, all of which require the use of modern and efficient database technology. As a high-performance NoSQL database, Redis can help us solve these problems.

Below, the author will share how to build an efficient and stable online mall flash sale system through Redis.

1. Business Design

When designing a flash sale system, the first thing to consider is the business process. Flash sales usually include the following steps:

(1) Display the event page

(2) The user selects the product for flash sale

(3) The user enters the verification code for verification

(4) User submits order

(5) System confirms order

(6) User payment is completed

In order to make the flash sale system more stable, we can do the following Optimize in several aspects:

1. Product details page design

Some special flash sale instructions and requirements can be displayed in advance on the product details page, such as: limited flash sale, limited purchase quantity per person, Activity time, activity rules, etc. In addition, a real-time flash sale progress bar and countdown can be added to the product details page. This can help users understand the current remaining number of flash sales and the time until the flash sale ends.

2. User access process design

To ensure the stability and rapid response of the system, a layered design is required. For user requests, Nginx can be used for load balancing and the requests can be sent to multiple Redis servers. At the same time, in order to avoid avalanches, measures such as request slow start and current limiting can be set to ensure the stability of the service.

3. User order design

In order to avoid oversold and mistaken buying, user orders need to be strictly designed. At the same time, a shopping cart lock needs to be set up to avoid shopping cart confusion. Only when the user submits an order and the inventory number stored in Redis is greater than zero, the system will issue the order and reduce the inventory number by one.

2. Application of Redis

In the above business process, a large number of operations require the use of Redis. Here, the author will introduce how to use the different functions of Redis to implement the flash sale system.

1. Flash sale product display

Store the main image and remaining inventory quantity of flash sale products in Redis, and implement inventory updates and flash sale status changes through scheduled tasks. In this way, you can ensure that the product data displayed on the front page is always up to date.

2. Verification code verification

In order to prevent a large number of false requests or robots from submitting orders, users can be asked to fill in and enter the verification code before submitting the order. Redis can be used as a distributed cache to store verification codes and ensure the security verification of verification codes by setting the expiration time.

3. User purchase limit

In order to ensure fairness, each user can only purchase one product. In Redis, you can set up a hash table to store the items and quantities purchased by the user, and give a prompt when the user purchases for the second time. If the user has purchased once, the corresponding hash table information is recorded in Redis.

4. Order information storage

After the flash sale activity is completed, the user order information is stored through Redis, and the expiration time is set to ensure that the user can perform payment operations within a certain period of time. If the user does not pay within the specified time, the order is automatically canceled.

5. Inventory control

The most important point of the flash sale system is to ensure the accuracy of the inventory. The inventory number of flash sale items is stored through Redis's distributed cache, and the atomicity of the inventory decrement operation is ensured through Redis transaction operations. In this way, even if multiple users submit orders at the same time, the inventory will not be oversold.

3. Summary

The above is the sharing of Redis application examples: the entire content of the online mall flash sale system design. Through the clever use of Redis, we can ensure the efficient, stable and smooth operation of the flash sale system. Of course, this is just a basic solution and needs to be implemented according to actual conditions for different business scenarios. I hope this article can provide some reference and inspiration for readers to better apply Redis to build high-performance business systems.

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