I was cheated by my colleagues to work overtime on weekends. I haven't seen redis used like this...

This year's 618 The atmosphere is a little cold , The major Internet companies have not publicized as much as before , So far, it is not clear that this year 618 All kinds of data , What we are concerned about as programmers is 618 Back end technologies of major e-commerce companies , For example, the annual peak transaction orders , In my impression, the peak value of e-commerce promotion still stays at the peak value of tmall's double 11 days of the previous year 58.3 Ten thousand strokes per second .

I don't know how the final data released this year , So here's what you can think about , Before the promotion, major companies must have made large-scale optimization of their internal systems , The optimization mentioned here does not mean simply adding ECs , But for all dimensions of the system , such as ：

Java application layer , Bottom JVM, Cache layer (Redis)、 Database layer (Mysql), Middleware layer , The network layer , And cloud environment , All kinds of monitoring 、 Full link voltage measurement is a necessary lesson .

Here, the architecture and optimization of the cache layer is particularly critical , Many students may not have the opportunity to contact at work , It is also possible that the system concurrency pressure is very small , Not much cache , However, cache architecture and optimization are essential skills for senior engineers , It is also a highly paid technology that wants to enter a first-line Internet company .

About redis I've read a lot of books , Although it's all good , But few can go deep into the source code , I saw a self-produced by Ali Daniu a few days ago “Redis In depth notes ”, At least it's the most perfect I've seen so far , The most profound note .

Here are some screenshots , The free download address is attached at the end of the article

The notes are roughly divided into the following parts ：

• Opening basic part
• Nine application parts
• Eight principles
• Three clusters
• Nine expansion parts
• Seven source code parts

One 、 Opening basic part

1. The opening ： To give a man a fish is not to give a man a fish -Redis What can you do with it
2. Basics ： Ten thousand Zhang tall buildings rise from the ground -Redis Infrastructure

Two 、 Nine application parts

1. Thousands of sails racing - Distributed lock
2. a plot to gain time in order to complete defense - Delay queue
3. scant oneself in food and clothes - Bitmap
4. Four or two thousand catties -HyperLogLog
5. layer upon layer of peaks and knolls - The bloon filter
6. Tail breaking - Simple current limiting
7. too stingy to pull out a hair - Funnel restriction
8. The advantage -GeoHash
9. look for a needle in a bottle of hay -Scan

3、 ... and 、 Eight principles

1. penetrated - Threads IO Model
2. whisper - Communication protocol
3. Save against a rainy day - Persistence
4. Carry out with drive and sweep - The Conduit
5. In the same boat - Business
6. The grapevine -PubSub
7. Open source throttling - Small object compression
8. Be prepared against want - Master slave synchronization

Four 、 Three clusters

1. palm off a substitute for the real thing -Sentinel
2. Divide and rule -Codis
3. Unity is strength -Cluster

5、 ... and 、 Nine expansion parts

1. very alert -Stream
2. know everything -Info Instructions
3. Pick up the missing - Let's talk about distributed locks
4. the brevity of life - Expiration strategy
5. Superior bad discard -LRU
6. The smooth wave moves slowly - Lazy delete
7. Good hands and kindness - Use... Gracefully Jedis
8. In time of peace prepare for war - Protect Redis
9. beware of eavesdroppers - Redis Secure communications

6、 ... and 、 Seven source code parts

1. Extremely deep cold - Explore （ String character ） internal structure
2. Extremely deep cold - Explore （ Dictionaries ） Inside
3. Extremely deep cold - Explore （ Compressed list ） Inside
4. Extremely deep cold - Explore （ Quick list ） Inside
5. Extremely deep cold - Explore （ Skip list ） internal structure
6. Extremely deep cold - Explore （ Compact list ） structure
7. Extremely deep cold - Explore （ Cardinal tree ） structure

Redis There are many knowledge points involved , The author of this note has sorted it out completely , But still unable to take into account Redis In every way , But it's already the best you can find .

If you need it, you can click the following business card to get it for free .