Top level "redis notes", cache avalanche + breakdown + penetration + cluster + distributed lock, Nb

If you're a back-end Engineer , 80% of the interviewees will be asked about  Redis, Especially the big Internet companies , Not only is it required that the interviewer can simply use  Redis, We also need to deeply understand the underlying implementation principles , Ability to solve common problems . so to speak , Skillfully use  Redis  It's a necessary skill for a back-end engineer .

But I found that , At work or in an interview , We still have questions like this , such as ： How to use  Redis  Implement distributed locks ？Redis  How to deal with expired keys ？ Cache avalanche 、 through 、 How to solve the hot issues ？ Persistence 、 How to choose the cluster scheme ？ How to give gracefully to  Redis  Do key value analysis ？ wait .

here , I'd like to share with you one  

Redis  Problem portraits

, Help you quickly find the problem corresponding to  Redis  Mainline module , And then locate the corresponding technical points .

lately , This paper summarizes a system of efficient  Redis  route , Help you understand  Redis  The core principle , And through hands-on combat , Master cache solutions in high concurrency scenarios , Unlock  Redis  High frequency interview questions , Let you both in the job and in the interview , It's all going well .

I find , Many people study with specific questions  Redis  Of , These questions are of course important , But if you only focus on the scattered technical points , No complete knowledge framework has been established , It's hard to get a qualitative improvement in your ability to use it .

that , How to form  Redis  System view ？ in my opinion , Namely “

Two dimensions , Three main lines

”： The former refers to system dimension and application dimension , The latter is high performance 、 High reliability and scalability .

from

System dimension

Say above , We need to understand  Redis  Design principles of key technologies , Master some system design specifications , for example  run-to-complete  Model 、epoll  A network model , In order to apply to the subsequent system development . but  Redis  The knowledge points of our school are very fragmentary , therefore , May, in accordance with the “ Three main lines ” Classify them ：

• High performance mainline
  , Including thread model 、 data structure 、 Persistence 、 Network framework ;

• High reliability mainline
  , Include master-slave replication 、 Sentinel mechanism ;

• Highly scalable mainline
  , Including data fragmentation 、 Load balancing .

secondly , stay

Application dimension

On , May, in accordance with the  “

Application scenario driven

” and “

Typical case driven

” Two ways to learn , One is “ Noodles ” The carding of , One is “ spot ” Mastery .

We all know , Caching and clustering are  Redis  The two most widely used scenarios . In these scenarios , It has an explicit technology chain . such as , When you talk about caching, you think of caching mechanism 、 Cache replacement 、 Cache exception and a series of problems .

But not all of them fit this way , such as  Redis  Rich data models , And some of them are more hidden 、 Problems that arise only in specific business scenarios , You can use it “ Typical case driven ” The way , Take apart a little bit about  Redis “ Three tenors ” Cases where the characteristics have a great influence , for example , The number of visits by major factories is trillions 、 In the case of data volume , Yes  Redis  In depth optimization practice of .

such , In order to fully understand  Redis, Build a structured knowledge system , Quickly find the key factors that cause the problem , Even organized into  Checklist, As a matter of fact, when you have a problem “ up one's sleeve ”.

More specifically , The content is mainly divided into five parts ：

One 、Redis  Basic data structure and actual combat scenarios

Two 、Redis  Common exceptions and Solutions

3、 ... and 、 Common application scenarios in distributed environment

Four 、Redis  Cluster pattern

5、 ... and 、Redis  A detailed explanation of common interview questions

6、 ... and 、 Friends in need can click in to have a look , Click on

——【 Portal 】——

that will do

Here's the complete list ：

One 、Redis  Basic data structure and actual combat scenarios

Two 、Redis  Common exceptions and Solutions

3、 ... and 、 Common application scenarios in distributed environment

Four 、Redis  Cluster pattern

5、 ... and 、Redis  A detailed explanation of common interview questions

• Redis comparison memcached What are the advantages ?

• Redis Which data types are supported ?

• Redis What are the main physical resources consumed ?

• Redis What is the full name of ?

• Redis What are the data elimination strategies ?

• Redis Why doesn't the government provide Windows edition ?

• What is the maximum capacity of a string type intelligent storage ?

• Why? Redis You need to put all the data in memory ?

• Redis What should the cluster solution do ? What are the plans ?

• Redis When will the cluster scheme cause the whole cluster to be unavailable ?

• Redis What are the transaction related commands ?

• Redis How to optimize memory ?

• Redis How the recycling process works ?

• Redis What algorithm is used for recycling ?

• Redis How to do large data insertion ?

• Why do it Redis Partition ?

• You know what Redis Partition implementation scheme ?

• Redis What are the disadvantages of zoning ?

• Redis How to increase the capacity of persistent data and cache ?

• Distributed Redis Is it done in the early stage or in the later stage ? Why? ?

• Twemproxy What is it? ?

• What are the clients that support consistent hashing ?

• Redis And others key-value What's the difference between storage ?

• Redis How about the memory usage of ?

• There are ways to reduce Redis The memory usage of ?

• One Redis How many instances can be stored at most keys?

• Redis Common performance problems and solutions ?

• Redis What kinds of persistence are provided ?

《Redis Practical advanced documents 》PDF Engineers who need the version can click in to have a look , Click on

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that will do ！