The peak season for recruitment is here. I don’t know if you have noticed one thing. Whether it’s a major Internet company or a start-up company, those interviewers always like to talk to you about high concurrency.
Even though their company's business volume is only tens of thousands of QPS, they just want to use this to test you to see if your foundation is solid.
In today's IT industry, especially programmers, if you have no contact and understanding of high concurrency, it would be too ignorant. As an excellent programmer, high concurrency system architects must master it. Very simple, most Internet companies now use high-concurrency system architecture design. Common "seckill activities", "grab red envelopes", "microblogging hot search", "12306 ticket grabbing", "sharing bicycles to attract new users" are all typical business scenarios with high concurrency, and programmers who can solve these common business scenarios They are all good players in the company, not to mention the extra annual salary of 30W, which is appropriate.
Common high-concurrency scenarios include: grabbing tickets during holidays, popular Weibo, e-commerce Double 11, etc. With the development of business, these concurrent scenarios gradually appeared.
The high-concurrency architecture is not a genius thinking hard or having an idea. This process evolves with the development of the business. To use a metaphor, there is Qiu Mingshan first, and then the old driver.
The high-concurrency architecture is a process of continuous evolution. It is not a one-day process to freeze three feet, and it is not a one-day effort to build the Great Wall. It is very important to lay a good infrastructure to facilitate future expansion.
Today's Internet company interviews mostly ask you about the three-high structure. If you can't grasp it, you will basically not get a high salary.
Many fans wrote to me privately and said: I don’t have access to high-concurrency projects at all in my usual work. How can I improve myself?
Don't panic, today LZ will share with you the "Billion-Level Concurrent System Architecture Design Notes" that an old Ali brother privately taught me some time ago , so that you won't be afraid of being made things difficult by the interviewer in the next interview!
"Billion-Level Concurrency System Architecture Design Notes"
Explanation: The article is limited in length, so only a part of it will be shown. The complete "Billion-Level Concurrency System Architecture Design Notes" document LZ has been sorted out. Friends who are learning high concurrency or want to review this document as an exercise
Note directory
Basic
Database
Cache
Message Queue
Distributed Services
Maintenance
Combat articles
content excerpt
What is layered architecture
Performance optimization under high concurrency
Ideas for High Availability System Design
How to make the cache highly available?
Principles of Microservice Splitting
Algorithms for fixed windows and sliding windows
How to design an unread system at 500,000 QPS?
Learning testimonials
First take you to establish an intuitive understanding of high-concurrency system design, and then take the simplest architecture to gradually evolve into a distributed architecture that supports millions or tens of millions of concurrency as a case, take you to solve the pain points encountered in this process, and improve business processing Ability to truly complete a system evolution, and finally optimize the overall design idea in combination with actual combat.