What is high concurrency
High concurrency is when the system processes many requests at once.
High concurrency is a results-oriented thing. For example, common high concurrency scenarios include: Double 11 of Taobao, snatching tickets during Spring Festival travel rush, hot news of Weibo V, etc. These typical scenarios do not emerge suddenly, but gradually emerge with the development of business development. For example, in the global carnival season of Taobao Double 11 in 2020, the peak value of order creation reached a staggering 583,000 transactions per second. Four years ago, in 2016, this figure was about a quarter. Four years ago, this figure was impossible to test, but it was certainly not so exaggerated.
A high-concurrency business scenario emerges, and with it the architecture to support this high-concurrency business scenario — technology needs to serve the business, and the business forces technology to evolve. Highly concurrent architectures are not the brainchild or brainwave of some genius; they evolve as the business evolves. To use a metaphor, the famous autumn mountains, before the old driver.
Today to share a 2021 Alibaba Java 10 billion concurrent system design notes (full color version)
Chapter directory
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Part of content display
Database section – Threads are pre-created with thread pools
Cache Aside strategy
Message Queue – How to ensure that messages are consumed only once
Distributed Services – RPC as you know it
How to reduce the storage cost of counting system
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