[Tencent Alibaba's most comprehensive collection of test questions] (four sides: three rounds of technology +1 round of HR)

one side

Introduce the project

​ ​Java Implementation principle of thread pool ,ThreadPoolExecutor Key parameter interpretation ​​

hashmap Principle , Why is the capacity 2 The power of

Why rewrite at the same time hashcode and equals

ConcurrentHashMap How to achieve thread safety ？

Introduce Java Multithreading 5 Big state , And state diagram flow process

​ ​ introduce Synchronized、Volatile、CAS、AQS, And their use scenarios ​​

B+ Tree and red black tree time complexity

How to analyze and solve the frequent recycling in the old age

JVM Memory model , Recycling mechanisms for the new generation and the old

mysql limit How pagination ensures reliability

Two sides

Self introduction.

java nio,bio,aio, The bottom of the operating system nio Realization principle

Spring IOC,autowired How to achieve

Spring Transaction propagation mechanism

Thread deadlock troubleshooting

MySQL Engine and difference , Which is used for the project , Why?

RPC Why http Communication ？

RPC How to balance the load at both ends ？

mycat Sub database and sub table 、 The realization of the separation of reading and writing

How to ensure data consistency for distributed data

High concurrency request processing , What are the flow peak shaving measures

On three sides

Talk about the most challenging technology project you have ever worked on

Redis Persistence RDB and AOF The difference between

MQ Underlying implementation principle

Introduce the distributed system in detail Uniformity Hash Algorithm

nginx Load balancing algorithm

Nginx Of upstream At present, we support which 4 Ways of distribution

After the distributed cluster is deployed , What needs to be adjusted from the application side

Dubbo What registry is used by default , Is there any other choice ？

mongoDB、redis and memcached Application scenarios of , Respective advantages

Talk about your performance optimization practices , Optimization idea ？

20million users rush to buy at the same time , How do you design ？

Four sides (HR Noodles )

What advantages do you think you have ？ What's the downside ？ Give an example of . How can you overcome your shortcomings ？

What do you think is the most fulfilling thing , What's wrong with you , How? ？

If you encounter technical problems in your work , You can't solve it for the time being , Your response ？

If a company gives you a higher salary than Ali , How do you choose , Why did you choose ？

Talk about the future 3-5 Your career plan ？