The third stage: building the day15 redis cluster

Half bump 2020-11-09 16:06:39
stage building day15 day redis

  1. Realization Redis colony


1.1 Why you need to build a cluster

redis Fragmentation features :
1. Can achieve Redis The expansion of memory data .
2.redis The slicing itself has no high availability effect . If the outage will directly affect the use of users .

redis Sentinel characteristics :
1.Redis Sentinels can achieve Redis High availability of nodes . But the sentinel itself doesn't implement a high availability mechanism .( It's better not to introduce third parties )
2.Redis The sentry has a master-slave structure The backup of memory data is realized . But did not achieve the effect of memory expansion .

upgrade :
need Redis Content expansion also requires Redis High availability, so you should use Redis colony .

1.2 About Redis How to build a cluster

  1. Close all redis The server
  2. Delete redundant files
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    3. restart redis The server Execute mount command
`redis-cli --cluster create --cluster-replicas 1`

1.3 Redis Introductory cases

public void testCluster(){
Set<HostAndPort> nodes = new HashSet<>();
nodes.add(new HostAndPort("", 7000));
nodes.add(new HostAndPort("", 7001));
nodes.add(new HostAndPort("", 7002));
nodes.add(new HostAndPort("", 7003));
nodes.add(new HostAndPort("", 7004));
nodes.add(new HostAndPort("", 7005));
JedisCluster jedisCluster = new JedisCluster(nodes);
jedisCluster.set("cluster", " Cluster testing !!!!");

1.4 About the electoral mechanism - Cleft brain

explain : When the cluster goes on At election , If continuity 3 Time There were The result of the even vote The brain cleft phenomenon may appear in patients with cerebral palsy .
problem : What is the probability of cleft brain ??? 1/8
mathematical modeling :
Throw silver coins in succession 3 How much is the concept of flat ticket ? 1/8=12.5%
for the first time : Zhengzheng Pros and cons Anyway Against 1/2
The second time : Zhengzheng Pros and cons Anyway Against 1/2
third time : Zhengzheng Pros and cons Anyway Against 1/2
The prevention of : Increasing the number of master nodes can effectively reduce the occurrence of cleft brain .

1.5 About group interview questions

problem 1: Redis Most storage in the cluster 16384 Data ???
In the wrong Partitions are only responsible for partitioning data The storage of data is determined by memory .
crc16(key1)%16384 = 1000
crc16(key2)%16384 = 1000
problem 2: Redis The maximum number of hosts in the cluster ?? 16384 host .
One host occupies one channel

1.6 SpringBoot Integrate Redis colony

1.6.1 edit pro The configuration file

`# To configure redis Single server
# To configure redis Fragmentation mechanism
# Configure sentinel nodes
# To configure redis colony

1.6.2 edit RedisConfig Configuration class

public class JedisConfig {
private String clusters;
public JedisCluster jedisCluster(){
Set<HostAndPort> nodes = new HashSet<>();
String[] nodesArray = clusters.split(",");
for (String node : nodesArray){
String host = node.split(":")[0];
int port = Integer.parseInt(node.split(":")[1]);
HostAndPort hostAndPort = new HostAndPort(host,port);
return new JedisCluster(nodes);

1.6.3 edit CacheAOP

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1.7 About Jingtao project background description

Summary of knowledge points :
1. Frame strengthening stage
1.1SpringBoot Description of each configuration file pom.xml To configure Commonly used annotations springboot Start the execution process
1.2 About SpringBoot Common use Attribute assignment @Value , Development environment optimization , Profile import , Integrate Mybatis , Integrate MybatisPlus , Integrate web resources (JSP)
1.3 Jingtao backstage project construction
1.3.1 Distributed thinking According to the module / Split by hierarchy
1.3.2 Ideas for the creation of polymerization engineering Parent project Unified management jar package , Tools API project , Business function system
1.4 UI Tools Data interaction between the front end and the back end If you want to show a particular format structure , Must be returned as required VO object .
1.5 JSON Structure form 1.Object type 2.Array type 3. Complex type ( You can nest at infinite levels )
1.6 Backstage goods / Merchandise classified CURD operation .
1.7 Introduce rich text editor / Realize file upload business .
1.8 Reverse proxy / Forward agency
1.9 NGINX Realize image echo , NGINX install / command / Process item description / Domain name agent / Load balancing mechanism / Description of relevant properties
1.10 windows tomcat Server cluster deployment .
2.Linux Study
2.1 What is? VM virtual machine . Network configuration description The bridge /NAT Pattern
2.2 Introduce Linux Development , Introduce Linux Basic commands install Linux JDK tomcatLinux Deploy . Linux install Mysql data
2.3 Linux install Nginx The server . Whole project Linux Deploy .

3. Project real deployment
3.1 Realize the separation of reading and writing data / Load balancing / Database high availability mycat
3.2 Redis command /redis Single operation /redis Fragmentation /redis sentry /redis colony /
3.3 AOP Related knowledge .

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  1. Jingtao project front desk building


2.1 Jingtao project architecture

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2.2 Jingtao foreground project construction

2.2.1 Create project

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2.2.2 Add inheritance / rely on / plug-in unit

explain : edit jt-web Of pom.xml The configuration file The packing method should be changed to war secondly Add inheritance / rely on / plug-in unit

`<?xml version="1.0" encoding="UTF-8"?>
<project xmlns=""
<!--2. Add dependency information -->
<!-- What depends essentially on is jar Package file -->
<!--3. Add the plug-in -->

Import the files from the pre class materials into . As shown in the figure .
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2.2.3 About web Description of project data source error report

SpringBoot When the program starts, it needs to load the database, but there is no configuration information of the data source . Result in an error .
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How to solve : Add exclude data source start .
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2.2.4 modify SpringBoot Start item

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2.2.5 Start the effect test

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2.2.6 edit Nginx The configuration file

explain : Require users to pass visit localhost:8092 The server .
modify nginx Restart the server after that .

`# To configure jt-web The server
server {
listen 80;
location / {

edit hosts file .
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2.2.7 About Google browser https Disable problem

Google browser type : chrome://net-internals/#hsts:
After the modification is completed , Restart the browser .
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2.3 A note on pseudo static

2.3.1 Business description

problem 1: Jingdong has a lot of goods , If all adopt the form of static page to show data for users , If there is 100 Ten thousand goods , So you need 100 Ten thousand products xxx.html page . ask : Does Jingdong do this ???
Implementation rules :
Should be dynamic access to goods ID Number . Then query the database , Then adjust the specified page , Fill in the data .

problem 2: Why does Jingdong adopt .html The request at the end shows the product ?
answer : use .html The page at the end , More easily included by search engines , Increase the exposure of the website .
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2.3.2 How search engines work

Working principle core : Inverted index mechanism . Search the position of the article according to the key words .
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2.3.3 Pseudo static thought

Pseudo static is relative to real static , Usually we do it for Enhance the friendliness of search engines , All the content of the article will be generated into a static page , But some friends in order to display some information in real time . Or I want to use dynamic script to solve some problems . Can't use static way to show website content . But this has lost the friendly side to search engine . How to find a middle way between the two , This produces Pseudo static technology . Pseudo static technology means that what is shown is to html One kind of static page form , But it's actually using ASP A class of dynamic scripts to deal with .

summary : With .html Dynamic page at the end . Enhance search engine friendliness .

2.3.4 Pseudo static implementation

explain : If you need to implement pseudo static , You need to intercept .html At the end of the request . Otherwise, the program thinks that you are accessing specific static resources, as shown in the figure
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Configuration class introduction

@Configuration //web.xml The configuration file
public class MvcConfigurer implements WebMvcConfigurer{
// Enable matching suffix configuration
public void configurePathMatch(PathMatchConfigurer configurer) {
// Turn on suffix type matching . xxxx.html
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