Writing in the opening

To make a long story short:

The beginning of this year is some special, the epidemic caused a great impact on our lives, which for a job seeker, is added to a “difficult wall”, although, but we can not miss the golden three silver four opportunities, should seize must seize. Now many Internet companies have adopted online interview, so make preparations in advance, send resume and interview smoothly, and I will definitely win the desired offer. And I finally achieved the success I want, bytedance successfully passed the customs in four rounds.

Personal Information:

Jiangnan town, born in Beijing to study, after graduation is stayed, record of formal schooling is undergraduate course, 211 qualifications all aspects are good, so in your resume can also fully embodies my own advantage, years ago, the sea have a resume, now has received a lot of companies to the olive branch, as long as the interview goes well, your choices basically is the company’s status.

There are many PDF files, such as interview question bank (including answer + analysis), study notes, practical documents and brain maps, etc., which can be shared for free.Click to get ~

Bytedance 4 core interview questions

01 Zookeeper part

  • The CAP theorem
  • ZAB agreement
  • Leader election algorithm and process

02 Redis part

  • Application scenarios of Redis
  • Data types supported by Redis
  • Data structure of zSET table
  • Redis data Expiration Strategy
  • Redis LRU expiration strategy concrete implementation
  • How to solve Redis cache avalanche, cache penetration problem
  • Redis persistence mechanism
  • Redis pipeline

03 Mysql part

  • The basic elements of a transaction
  • Transaction isolation level
  • How to solve the concurrency problem of transactions (dirty read, phantom read)?
  • MVCC multi-version concurrency control?
  • What are binlog,redolog,undolog and what do they do?
  • InnoDB row/table lock?
  • What is the difference between MyISam and InnoDB? When to select MyISam?
  • Why choose B+ tree as index structure?
  • What can be stored in leaf nodes of index B+ trees?
  • When does the query not go to the (expected) index?
  • How to optimize SQL?
  • How does explain parse SQL?
  • The order by the principle of

04 JVM part

  • Runtime data area (memory model)
  • Garbage collection mechanism
  • Garbage collection algorithm
  • Minor and Full GC trigger conditions
  • Stop the world in GC
  • Characteristics and differences of each garbage collector
  • Parental delegation model
  • JDBC and parent-delegate model relationships

05 Java Basics

  • HashMap is different from ConcurrentHashMap
  • ConcurrentHashMap data structure
  • How is the loop of a high-concurrency HashMap generated?
  • Volatile role
  • How Atomic classes are guaranteed atomicity (CAS operations)
  • The difference between synchronized and Lock
  • Why use thread pools?
  • Parameter to the core thread pool ThreadPoolExecutor
  • The workflow of ThreadPoolExecutor
  • How do I control the priority of thread pool threads
  • How do threads communicate with each other
  • Boolean takes several bytes
  • What are the new features in JDK1.8 / JDK1.7?
  • Exception and Error

06 Spring part

  • Spring IOC/AOP implementation
  • Dynamic proxy implementation
  • How Spring resolves loop dependencies (Level 3 caching)
  • Spring’s post-processor
  • How is Spring’s @Transactional implemented?
  • Spring’s transaction propagation level
  • The connection and difference between BeanFactory and ApplicationContext

07 Other Parts

  • How to implement current limiting in high concurrency system?
  • Design of high concurrency SEC kill system
  • How to design load balancing?

Bytedance interview question answer:

The answers to the interview questions are included in the PDF file. If you need answers to the interview questions, click here

What have I done to prepare for the bytedance interview?

(a) adjust their attitude, the correct face of gains and losses

The common problem in the interview, mainly is the mentality, the interview adjustment mentality is the first, how to adjust into the best mentality? Many job seekers in the interview process their thinking is not clear, language is not fluent, speak illogically, will constantly deny themselves, in the final analysis is the interview mentality, so it is very important to adjust their mentality, the correct face of gains and losses, my method is to give myself enough psychological hint.

(2) Upgrade technology and broaden knowledge

For programmers, the only way to grow into a great man in the industry is to constantly improve their skills, broaden their knowledge, and reach a certain height and depth through learning. So how to improve their own technology, broaden their knowledge reserve?

The following are some of my personal practices, I hope to provide you with some help:

  • 28 pages of PDF in 21 days

**Java Section: **Java Basics, Collections, Concurrency, Multithreading, JVM, Design patterns

** Data structure algorithm: **Java algorithm, data structure

** Open source framework part: **Spring, MyBatis, MVC, Netty, Tomcat

** Distributed parts: ** architecture design, Redis cache, Zookeeper, Kafka, RabbitMQ, load balancing, etc

** Microservices: **SpringBoot, SpringCloud, Dubbo, Docker

  • Actual combat series: Spring family barrel +Redis and so on

  • Other related ebooks: source code + tuning

(3) brush the questions

How to brush questions? This is a lot of confusion in the mind of the interviewer now, we all know that it is necessary to brush questions before the interview, after all, many questions have certain commonalities, brush enough questions can do inferring, even in the interview, when asked the original question, can talk with ease, so how to brush questions? Suggestion: had better look for the interview of a few years original topic, cent special topic will undertake training to oneself.

Here are my personal interview questions:

conclusion

The last point I want to emphasize for the interview is that your attitude is really important, which is the key to determine your performance in the interview process. If you can’t play well, you may lose the offer due to a small mistake, so you must pay attention to it. Another point to remind, full review, is the key to eliminate your nervous state of mind, but you review enough, the natural interview process will be much more confident.

All the learning materials and interview materials in the above content can be provided free of charge. I hope you can have a smooth interview and win your favorite offer!

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