Two years of crud, two graduates, two months of preparation for the interview with ALI, and fortunately won the offer grading p6

For a lot of people who don't have educational background , It's very difficult to interview a large factory , This is for me , Is the same , Born in two books , I thought I would spend my life at three o'clock , Until the changes in life , So that I have new ideas and goals , So I struggle with this two scum , Took Ali P6 post . Today, share this book , The main hope is to be able to motivate the technical people who are also plagued by their academic qualifications , Can have a reference value to career and technical planning , thank ！

Yes Java Architecture advanced data , Learning Roadmap 、 The real question of the interview 、 Old iron of dry goods video

One 、 Interview Ali P6 Where is it? ？（ Interview difficulties ）

（1） Difficult in “ State of mind ”

The first hurdle to overcome , In fact, it's my own mentality . Because I came from two families ,base A relatively low , So the interview with aliben is a matter of little confidence , What's more, senior development post , So it 's easier to be in the dark . therefore , Before preparing for the interview , It's been a long time since I adjusted my mind , So it's hard “ State of mind ” Not at all , The mentality has not been adjusted , Interviews are almost impossible .

（2） Difficult in “ requirement ”

Secondly, the requirements , The so-called requirements are actually Ali's requirements for the post , As a developer , How many technology stacks have you mastered ？

First , You must be able to , Second, you need to have some highlights , That is to say, have a deep understanding of a certain technology , This will give the interviewer a fresh feeling .

that , Interview Ali P6 post , How much do you need to master ？

Java aggregate ：HashMap and ConcurrentHashMap, You'd better read some source code at ordinary times , It's better to know why each parameter is set so large ？ What are the benefits ？

JUC Bao must learn , Even if you don't use normal programming at all , You have to . At least know aba,cas,aqs,unsafe,volatile,sync, And common lock, Deadlock , Thread pool parameters, etc , 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 .

Big factory will ask JVM： Garbage collection algorithm , Garbage collector 、JVM Memory model , Purpose of each area , Various oom The type of ,jvm Tuning experience , Class loading process , Appointment of parents, etc .

Spring I have to find time to read the source code , Usually asked bean Life cycle of , How to solve circular dependency , Implement transaction principle , Dynamic agent principle, etc .

Dubbo It must be asked , Design framework , Load balancing .

Redis More understanding , Single thread model ,aof,rdb,rewrite, Master-slave ,cluster, What types ？ Include some common problems with cache breakdown 、 through 、 An avalanche 、 Data consistency, etc .

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 , What are the solutions ？ What are the good Middleware in the industry ？

Java Architecture advanced thought map

Two 、 Ali interview questions （ common 5 Noodles ）

Ali side ：

Self introduction. 、 Self made projects and technical fields

The way sync The underlying implementation of , Lock the optimization , and lock Comparison of

Let's talk about JVM Detailed process of parameter tuning

Why is this setup ？ What are the benefits ？ describe gc scene , How to analyze gc journal ？

redis data structure , Use scenarios , Microblog scenario use redis How to design user relationship ？

Thread pool parameter setting , Why is this set , effect ？7 Big parameters

spring How to solve the circular dependence of ？ Why Level 3 caching ？

The underlying principle of priority queue ？

Ali on both sides ：

Introduce yourself

Talking about projects

Ask you how to design with your project , Put forward loopholes , How do you solve ？ How to improve , One thousand hang up ？ Is there any problem with adding a machine ？ What if I have to go wrong ？

How to design the scenario of high and issued single deduction inventory

rocketMQ The principle of Architecture Design

Dubbo Framework implementation principle

What books have you read recently ？ How do you usually learn ？

Common load balancing , How to use , Can you say something ？

Three sides of Ali ：

This side mainly asks about the project , It gives you a strong sense of pressure

Combined with project questions , Why is it designed this way? ？ Let you optimize , How do you optimize , Guide you to optimize... In a reasonable and better way , Database design, etc

What did you do in the company , What does each system business line do , Your performance , Handwritten algorithm chain inversion ？

All around Ali ：

JVM The main components and functions of ？

JVM What does the runtime data area contain ？

JVM Garbage collection mechanism , When the trigger MinorGC Wait for the operation

JVM Garbage collection algorithm ：

JVM Tools for tuning ？

frequently-used JVM Tuning parameters ？

Stack differences ？

So let's talk about that CMS Garbage collector ？

How do you determine if an object can be recycled ？

What are the new generation garbage collectors and old generation garbage collectors ？ What's the difference? ？

java Class loading process ?

Tell me all the middleware you know （ A moment of confusion ）

HR Noodles ：

Why come to Ali ？

Didn't you think about Ali before ？

It's been so long since I graduated , What do you think is your biggest change ？

Summarize yourself in one sentence

3、 ... and 、 Before interview with ALI , What preparations have I made .

（1） Prepare your resume

Resume is the facade , It's more like knocking on the door , Can I get an interview with a large factory , It depends on your resume , Forget the education accident , The most important thing for big factories is whether their resumes have bright spots , So we should be prepared for the content of the resume , Highlight yourself , Including technical 、 Personality highlights , To practice expression , Avoid temporary organization language .

（2） Improve your skills

Actually, a friend of Ali's told me a long time ago , Many people think that big factories value education , But the reality is not entirely , In Ali, we only talk about heroes with ability . therefore , In everyday life , Through continuous learning , Improve your ability , Try to close the distance between yourself and the target value , It is necessary to , It's also an inevitable trend in the future .

About improving the breadth and depth of your technology stack , Here's what I did ：

① Read the actual combat documents

② Read some source code

③ Read some technical notes

（3） Swipe interview questions

about base Not so nice , Brush interview questions is actually the most “ First aid ” Method of effect , So before the interview with ALI , I did a lot of interviews , The purpose is not to be asked the original question during the interview , But to have a corresponding understanding of the big factory interview , Know what Ali will ask during the interview , Which technology stacks are involved .

①Java Arrangement of core interview knowledge points

② The algorithm part （LeetCode+ The fun of algorithms ）

③BAT The real interview question of Dachang + Special training

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Make a conclusion.

Many people with poor academic qualifications , Maybe I don't have much confidence in myself , In fact, everything “ Miracle ” happen , And this “ Miracle ” The key is to create by yourself . No matter you are a rookie , Or technology , I can't fall behind to study everyday .

Opportunities are reserved for those who are prepared , Only enough preparation , To be able to stand out from the candidates .