Tag：Place an order
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Time：2021-7-14
How to achieve high availability in high concurrency system principle CDN; CDN; Nginx current limiting, asynchronous queue (high concurrent traffic becomes shared traffic)Divide and rule: LVS + nginx load balancing features Write strong consistency (not oversold)Read weak consistency (read may be in stock, but cannot place an order) Core implementation Implementation of reading serviceWrite service […]
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Time：2021-7-2
MySQL trigger sqlstate [42s22]: column not found: 1054 unknown column ‘now. Order_ no’ in ‘field list’ Prompt this error is to write new wrong now when adding Before modification (“INSERT”,new.order_ no,new.user_ ID, 0,0,0, “user orders”); After modification (“INSERT”,new.order_ no,new.user_ ID, 0,0,0, “user orders”); This work adoptsCC agreementReprint must indicate the author and the link of […]
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Time：2021-7-1
Let’s talk about an interesting topic today How to optimize the concurrency of distributed locks in the scenario of thousands of orders per second? Background introduction First of all, let’s look at the background of this problem? Some time ago, a friend was interviewing outside. Then one day, he came to me and said: […]
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Time：2021-6-18
Official references Signature:https://pay.weixin.qq.com/wiki/doc/apiv3/wechatpay/wechatpay4_0.shtml Signature generation:https://wechatpay-api.gitbook.io/wechatpay-api-v3/qian-ming-zhi-nan-1/qian-ming-sheng-cheng Unified order interface:https://pay.weixin.qq.com/wiki/doc/apiv3/apis/chapter3_2_1.shtml How to view certificate serial number:https://wechatpay-api.gitbook.io/wechatpay-api-v3/chang-jian-wen-ti/zheng-shu-xiang-guan#ru-he-cha-kan-zheng-shu-xu-lie-hao Private key and certificate:https://wechatpay-api.gitbook.io/wechatpay-api-v3/ren-zheng/zheng-shu#sheng-ming-suo-shi-yong-de-zheng-shu First of all, I declare that this is the interface provided for app payment!!! Other terminals are for reference only 1、 Signature Generate signature reference materialIt’s more detailed, and there are official documents, but the documents […]
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Time：2021-3-23
Soul torture Second kill this kind of big concurrent write scene, direct sub library sub table open dry? Is it difficult to cope with the peak traffic of second kill activity? Don’t cheat me with Taobao level second kill Characteristics of second kill activity I dare say that all the students who have done e-commerce […]
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Time：2021-2-10
We often encounter rush buying and second killing in online shopping, which is a very common application scenario. There are two main problems to be solvedHigh concurrency pressure on the database, resulting in server downtime, crash.2. How to solve the problem of inventory reduction (oversold) under the condition of competitionFor the first problem, it’s easy […]
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Time：2021-1-26
Sometimes life is a smooth wilderness, sometimes it is a ups and downs of the mausoleum, but as long as you love it, you can cross the mountains and rivers of the world. In the previous business, Kafka and rabbitmq message queues were used. This article will make a summary. Message queue middleware is an […]
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Time：2020-11-26
Tips: This article has been added to the reading list of series articles. You can click to see more related articles. preface The construction of Ocelot + consult has been completed in the previous article (5) – Ocelot API gateway (2) of. Net core microservices introduction. This article briefly introduces the eventbus. Eventbus – event […]
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Time：2020-11-23
Reading guide of Ali Mei:Serverless (no service architecture) is known as the next generation of cloud computing. Since the concept was introduced, it has become very popular in the industry because it can bring about the improvement of R & D delivery speed and the reduction of cost. The idle fish client is based on […]
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Time：2020-11-18
Soul torture Second kill this kind of large concurrent writing scene, directly sub database sub meter open dry? Is it hard to deal with the traffic peak of seckill? Don’t fool me with Taobao level seconds Characteristics of seckilling activities I dare say that all the students who have done e-commerce will encounter the “high […]
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Time：2020-10-27
Introduction to pessimistic lock (Encyclopedia) Pessimistic lock, as its name implies, is a conservative attitude towards the modification of data by the outside world (including other current transactions of the system, as well as transactions from external systems). Therefore, during the whole data processing process, the data is locked. The implementation of pessimistic lock often […]
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Time：2020-10-22
Create a new customer discount group under the price Settings > discount > customer discount groups menu in backoffice. This is just a place holder to store the specific discount information created later Maintain a discount record in discount. The discount is 20% and the ID is jerrydishcount_ 20: There is also a way and […]
