Baidu R & D suffered Waterloo on three sides: I was stunned by the interviewer's set of combination punches on the spot

now 6 In the middle of the , Although the peak season of gold, silver and four has passed , However, many large factories are still in a state of shortage of personnel , It's like ants 、 Jingdong etc. .

Some time ago , After a friend's introduction, I was lucky to interview Baidu , Before the interview is a more confident state , After all, there was nothing wrong with the previous technology , In the same age, it can be regarded as the great God level . But I don't know what Baidu interview is this year , On three sides, I was badly abused , Just hang up .

All notes mentioned below 、 Interview questions 、 Resume, etc , You can follow official account 【 Programming Xiaoyin 】

• According to convention Self introduction and project introduction
• sketch hash How did the conflict happen , What are the common processing methods , stay java Occur in the hash How to get multiple conflicts after a conflict value?
• Tell me about Java GC Mechanism ?
• Red black trees need to be compared in size to be inserted , What is the basis for comparison ? other Hash Conflict resolution ?
• JVM Memory model jmm Tell me all you know
• say something Java The principle of thread pooling ? What are the thread pools ? What type of thread pool does the thread pool factory have , And thread pool parameters ?
• BIO、NIO、AIO The difference and connection ?
• hash and B+ The difference between trees ? What scenarios are they applied to ? Which is better ?
• What's the concept of index and what's the use ?
• Java web Filter life cycle ?
• Tell me about TCP Three handshakes and four waves of the agreement ?
• mysql Database default storage engine , What are the advantages
• MySQL Transaction isolation level for , What problems should be solved separately .
• Talking about transaction characteristics (ACID)?
• Solution to generate unique order number under high concurrency
• Yes 10w Number How to play cpu performance Fast sum use java Realization
• What are the causes of deadlock ?
• Tomcat Class loading mechanism / J2EE In application class loader Hierarchical structure ?
• Is index scanning necessarily faster than full table scanning ? Why? ?
• Under Baidu's unified log system , If you do, for every request , Set a separate keyword ? In this way, you can quickly search the context through the unified log ;
• Chat spring Of IOC and AOP, What technologies are used ; In practical use , How to use ?
• Chat nosql, What are you familiar with ? for example mongodb、memcache、redis.
• Chat java Of juc frame , Be familiar with which of these classes , When did you use it , How to use ?
• Talk about jvm Your tuning strategy , If you have relevant handling experience in your work, please talk about .

Can only accept the facts , When he came back, he did his homework by himself , Sorted out a set of very systematic learning materials , Wait until the second half of the year .

One 、JVM piece

( contain ：JVM Class loading mechanism ,JVM Memory model , Garbage collection mechanism , Class bytecode implementation mechanism ,JVM Tuning case ,GC Detailed log explanation, etc )

Two 、Java Concurrent programming

( contain ：java Memory model , Concurrent sets , Thread pool , Blocking queues ,CAS And atomic manipulation , Lock free concurrency framework Disruptor etc. )

3、 ... and 、Spring piece

( contain ：spring IOC,spring AOP principle ,spring 5,springMVC, Business management , Cyclic dependence ,spring Design mode, etc )

Four 、Mysql piece

( contain ：SQL Execution principle , The underlying indexing mechanism ,SQL Perform plan analysis ,Mysql Locking mechanism ,Mysql The transaction isolation ,SQL Optimization practice, etc )

5、 ... and 、 Network and operating system

( contain ： Service discovery and registration Eureka And Nacos, Service current limiting fuse is degraded Hystrix And Sentinel, Distributed transactions Seata, gateway Gateway etc. )

6、 ... and 、Dubbo piece

( contain ：Dubbo Basics , Architecture design , colony , To configure , Communication protocol ,SPI etc. )

7、 ... and 、Redis piece

( contain ：Redis Core data structure ,Redis Persistence mechanism and security mechanism , Sentinel and cluster architecture ,Redis Cache penetration , Cache invalidation , Cache avalanche ,Redis Cache design and performance optimization )

8、 ... and 、 Distributed article

( contain ： The principle of distributed architecture , Cluster architecture principle , Distributed lock , Distributed transactions , Distributed protocol , Distributed configuration , Massive data is divided into databases and tables , Distributed scheduling , etc. )

Nine 、 Design patterns

( contain ： The singleton pattern , Factory mode , Abstract factory pattern , Builder pattern , Archetypal model , Adapter pattern , Decorator mode , Agent mode, etc 23 Design patterns )

Ten 、 Data structure and algorithm

( contain ： Red and black trees ,B+ Trees , Greedy Algorithm , Hash divide and conquer , Seven search algorithms , Dynamic programming , Consistency algorithm, etc )

11、 ... and 、MQ piece

( contain ： Lost message , Message re consumption , The news is out of order , There's a backlog of news , Delay queue , News backtracking consumption , Message refresh mechanism ,MQ Middleware cluster architecture principle, etc )

Twelve 、Netty piece

( contain ：BIO、NIO And AIO Threading model ,Netty Threading model , Serialization protocol protobuf, Sticking and unpacking ,Netty heartbeat , Direct memory and Netty Zero copy ,WebSocket Agreements, etc )

13、 ... and 、Zookeeper piece

( contain ：ZooKeeper The election mechanism ,ZooKeeper Data model ,ZooKeeper Application scenarios, etc )

fourteen 、ElasticSearch piece

( contain ：ElasticSearch Data model 、ElasticSearch Distributed architecture 、ElasticSearch Data reading and writing principle and segment merging, etc )

15、 ... and 、 Network and operating system

( contain ： Network protocol ,TCP/IP System structure ,TCP/IP Protocol family , Frequently asked questions , etc. )

Okay , That's all for this article , The answers to all the above questions are sorted into PDF 了

I have sorted out the relevant contents described above PDF

It's autumn now , It's a good opportunity for many people to change jobs , The interview in a large factory is far less difficult than expected , Set your mind , To prepare , You can do that, too .