ByteDance Interview Experience

Byte beating side:

Self introduction
Introducing the first project

The purpose of the project, the overall structure of the project, and a brief introduction to the modules

Realization of function permissions

Algorithmic questions:

Given two arrays, find the intersection of the two arrays, and print it as many times as you want

For example: [1,2,2,3,5,7] and [1,1,2,2,2,2,3,3,5,7,8], the result is [1,2,2,3, 5,7]

JVM memory structure?
OOM scene? Some differences between heap and stack?
The expansion mechanism of HashMap? Storage method? How to deal with the same code after hash?
What is the thread pool? how to use? what is the benefit? The core parameters of the thread pool?
The index structure of the database? The structure of the B+ tree? What is the difference with B-tree?
Did you know about Redis? Redis data structure? What is cache breakdown? How to deal with it?
Transaction isolation mechanism? What do the four transaction isolation levels mean and what are the differences? How is AOP used in the transaction isolation mechanism?
What information can be viewed with the top command of Linux? What does load in top refer to? Which network-related commands have been used? Which one is used to check the port number?
Optimistic lock and pessimistic lock? How to implement an optimistic lock in the database? The realization form of optimistic locking in the database?
TCP's sliding window mechanism?
Jenkins automated deployment process?
Do you have any questions?

Two sides of byte beating:

Self introduction
The requirement background of the project, as well as the structure of the project, the implementation details of the project
The third normal form of the database
Have you ever done a pressure test on the modules you developed? If you were asked to do a stress test, how would you do it?
If the data size increases by several orders of magnitude, what optimization can be made?

The use of joint index to reduce the number of back to the table

Redis cache

How to design the cache
Commonly used data structure in redis? Cache breakdown and cache penetration
Have you ever used the open source DevOps platform, the CICD platform?
Algorithm problem: taking sugar problem

Given an array {1,3,5,7,8,10}, the number in each position represents how many sugars are in each position

Can’t take adjacent candies, how can we take the most sugar in the end?

The function of the volatile keyword
Linux buffer memory and cache memory
Virtual memory, resident memory, shared memory
Which layer does the router and switch work on?
The difference between ConnectTimeOut ReadTimeout exception? What causes Unknown host?
The browser enters www.xxx.com to finally display the webpage, the whole process
Observer mode
Talk about zookeeper and ES
Any thoughts on the direction of development
What do you want to ask?

Byte beating on three sides:

Ask about graduation time, ask about GPA and graduate research direction
The specific details of the project, introduce the modules in charge, and the specific structure of the project?
What is DevOps? What are the usage scenarios for DevOps?
What is a microservice? The granularity of microservices? How to divide?
Ask for details of the project
Facing millions of data, how do you need to optimize your modules?
The technology used during development? Do you have an in-depth understanding?
Talk about the GC algorithm? What are the differences between G1 and CMS?
Do you have any questions?

Byte Beat HR:

Self-introduction, evaluation of company interview, internship time
Why switch to a major?
What do you think you have? What are the disadvantages? What are your hobbies?
What kind of role do you use to play in the team?
What are the more difficult things you have encountered? What do you think you are lucky?
For future plans? Have you used other products of the company? Do you have any thoughts on getting a positive?
What else do you want to ask?

Answers to ByteDance Interview Questions (obtained at the end of the article)

With a copy of "Interview Scripture pdf", I jumped around and won the offer of 1-2

Able to win the Bytedance offer, thanks to this "interview truth"

Java interview truth

This interview script is actually a compilation of the core knowledge points of Java interviews. There are many knowledge points included in the document, and it is very complete. The analysis and explanation of each knowledge point is also very clear. After reading it, you can basically figure it out. Nowadays, what questions will be asked in the interview and how to answer these questions will be very helpful to the interview.

Java basic part (basic collection class source code, concurrent programming, realization of lock, JVM principle, etc.)
Data Structures and Algorithms
MySQL database (index structure, optimization, transaction, statement execution, etc.)
computer network
operating system
Expansion part (open source framework source code, cloud native components, etc.)

With a copy of "Interview Scripture pdf", I jumped around and won the offer of 1-2

Study notes

In fact, when I review Java, I also rely on some great study notes, which I personally think are very well organized, including SpringBoot, Redis, Tomcat, MySQL tuning, etc.