A friend recently attended an interview with a front-line Internet company. He was asked some concurrent questions and asked if he could answer them.

(1) How to achieve the CPU primitive level of synchronized?

(2) What is the difference between no-lock, biased lock, lightweight lock and heavyweight lock, and how is the upgrade process?

(3) communication between threads, communication with the machine process, communication across the machine process, what are the methods?

(4) How thread pools should be used for the following three services:

  • Services with high concurrency and short task execution time

  • Services with low concurrency and long task execution time

  • Services with high concurrency and long service execution time

(5) Second kill system, how to support 100W level TPS (Taobao maximum 540,000 TPS)?

If you only have CRUD experience

Do not understand multithreading and high concurrency, faced with such an interview question, large probability confused.

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Ali P9 pure hand high concurrency system design manual to help you solve!

This manual is divided into basic, database, cache, message queue, distributed service, maintenance, combat

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Based on article

Database article

Cache article

Message queue

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Distributed Services

Maintain article

Practical article

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