Interview questions that big companies need to prepare

resume

resume , It's better to find a little brother from a big factory to help you see , So they think it's OK hr The eye of the law , Let them push you in , In this way, we can get the chance of interview , Otherwise, there will be no chance , I can only dream of a big factory .

It's better to have highlights in your resume , Something that can be quantified , Don't write too grandiose , It's a small system , We have to blow millions qps Words , Even if the resume is over , When the big guy faces you , You can't blow it , You know what .

A lot of people are similar to me , Day after day crud Of , What's the bright spot ？

yes , we have , You have to believe in yourself , What problems have you had , How? , What method was used , What's the effect ？

You put this 4 Even if you want to break your head, you have to think of it , Form a paragraph , Your highlights come out .

Of course , It depends on your usual time , There is no such thing , Then you go back and refactor the system , modular .

Otherwise, it's better not to go face to face , Because you can't do anything . To put it simply , It's the product manager's demand for something wonderful , What did you do , You can skillfully describe them as bright spots .

About the resume , Let big factory and little brother help you to have a look first . And then everything that's involved in it , You have to be able to “ make out a good case ”, What did you write? , You have to be able to , It's not the number of words , Or don't write .

I touched one dd The interviewer asked me everything I wrote , It's sour , But I basically answered .

This part of the resume simply talks about this .

Get ready , All interviews are to be prepared ！

I'm going to have advanced noodles , For advanced , Generally speaking, what you write on your resume must be able to , And there must be some of your highlights , You need to have some insight into , The answer makes the interviewer think that you are a young man , There's something .

Java Assemble, for example HashMap and ConcurrentHashMap I think , You'd better read the source code patiently at ordinary times , Search related blogs , It's better to know why each parameter is set to such a large size ？ What are the benefits ？ Why? ？ You'll find a lot of things , There are also a lot of videos on the Internet to learn .

JUC package , There is no doubt that , You have to learn , Even if you don't use programming at all , But you have to , I have to know that there is this thing , You have to know at least aba,cas,aqs,unsafe,volatile,sync, Common variety lock, Deadlock , Thread pool parameters and how to set them reasonably , You have to understand spin , Blocking , Deadlock and how to locate it ,oom How to locate the problem ,cpu How to locate too high and other basic operations , You may not have experience in production and commissioning , But that doesn't mean you can't top,jps,jstack,jmap These may ask . And possibly derived jmm Models and mesi Agreements, etc .

JVM No one's surprise , Big factories have to ask , Garbage collection algorithm , Garbage collector ,jvm Memory model , Purpose of each area , Various oom The type of ,jvm Tuning experience , No, you have to do it , Set the startup parameters yourself , Know the meaning of common parameters , Class loading process , Parents delegate , When young gc,full gc, The way things get into the old days , The more you know, the better , Because the more confident you're blowing , for instance , What is escape analysis ？markword What's in it ？

Spring, It's better to have a look at the source code , Minimum bean Life cycle of , How to solve circular dependency , Parent child container , also boot Startup process , Transaction implementation principle , Dynamic agent principle, etc , The more you know, the better .

Dubbo, Because I'm using dubbo, And I wrote it , This is also high frequency , I wrote what I had to ask , His design framework , Load balancing ,spi Mechanism , Generally speaking, it will be mentioned that zk, Election algorithm , Distributed locks, etc , Some common dubbo Questions can be searched , There are basic things on the Internet . May ask by the way cloud The problem of , Production is never used , You can now clone A project , Minimum , Internet baby , You have to know there's this thing , And what does he integrate , such as rureka,hystrix,ribbon,feign,zuul These regular things , What do they do ？

Redis, It must be , I know more about this convenience , You can fight the interviewer for a few rounds , It should not have come up and be beaten down , Single thread model ,aof,rdb,rewrite, Master-slave ,cluster, What types , Don't talk about the regular 5 A the , A few more words to tell you apart from other brothers , Include some common problems with cache breakdown 、 through 、 An avalanche 、 Data consistency, etc , You have to be able to , No, it's not going to work , Uniformity hash, The principle of Bloom filter , For this I also went to understand geohash And google s2 Principle , Underlying data structure sds And jump watch, etc , You learn more , It must be true .

Mysql, Business , lock , Indexes ,b+ Trees , You have to be able to

Mq , I am using rocketmq, You need to know why , Repeated consumption , Sequential message , Transaction message , High availability , Lost message , Squash scene , The whole process of message sending and consumption , Better read the source code , Better blowing

Netty Words , Zero copy ,bio,nio,aio, How does architecture design look ？ It's better to have seen it

Algorithm , It is suggested to brush the questions , I'm lucky , Simple algorithms let me run into , Some quick platoons , Stack row , Binary tree related , List reversal , Cyclization , Ring node , It is recommended to brush the conventional simple algorithm such as the step ladder , Double pointer ,dp, Recursion is more about feeling , Statistics of scenarios with limited big data memory , Have some time middle You can try , Handwritten red black tree if you can , Well, I guess the algorithm is stable .

The Internet ,http,tcp,https,udp,7 Layer network protocol, etc , It's better to understand , back , You have to memorize it .

There are also distributed transaction implementations , Architecture implementation , For example, robbing red envelopes , Common scene design such as high concurrent order , You design it , How do you design ？ Find more big bulls or check online , Let's see what's wrong , There are solutions ？ What are the good Middleware in the industry ？

Most of the preparatory work is almost done , I think it's about time to try

It's usually the same at the beginning of an interview , Self introduction. + Introduction to the most familiar system , Finally, it's all about what you want to ask him .

hr Noodles ：

It's old , Your Ali flavor must be enough , Why come to , Why didn't you come before ？

What has changed since graduation ？

In a word, summarize yourself , Anyway, you need to have a strong desire , At the moment , I am the only one , ha-ha ！

Emphasize a little , What does the resume say , You have to review in place ！ Prepare more , Failure is not afraid of , To sum up your experience , Study hard ！

You have to be quiet and outstanding , And then it's amazing ！