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How does Redis implement master-slave replication?

How does Redis implement master-slave replication?

1. What is Master&Slave? This is what we call master-slave replication. After the host data is updated, it is automatically synchronized to the master/slaver mechanism of the standby machine according to the configuration and policy. The Master is mainly for writing, and the Slave is mainly for reading. 2. What can it do? 1. Separation of reading and writing; 2. Disaster recovery. 3. How to play? 1. The slave (library) is not equipped with the master (library); 2. Slave library configuration: slaveof [main library IP] [main library port]; supplement: every time the slave is disconnected from the master, it needs to be reconnected, unless you configure Enter the redis.conf file; type inforeplication to view redis master-slave information. 3. Modify the configuration file

May 29, 2023 pm 02:21 PM
redis
How to handle redis queue in php

How to handle redis queue in php

Store the request in redis In order to simulate multiple user requests, use a for loop instead of //redis data enqueuing operation $redis=newRedis();$redis->connect('127.0.0.1',6379);for($ i=0;$ilPush('test',rand(1000,9000));}catch(Exception$e){echo$e->getMessage();}}############ ##################

May 29, 2023 pm 02:19 PM
PHP redis
How to install redis extension in PHP under Linux

How to install redis extension in PHP under Linux

Description: Operating system: CentOSphp installation directory:/usr/local/phpphp.ini configuration file path:/usr/local/php/etc/php.iniNginx installation directory:/usr/local/nginxNginx website root directory:/usr/local /nginx/htmllinuxphp specific steps to install redis extension 1. Install the compilation tool yuminstallwgetmakegccgcc-c++zlib-developensslopenssl-develpcre-develkernelkeyutilspatch

May 29, 2023 pm 02:01 PM
Linux PHP redis
Example analysis of master-slave replication, sentry, and clustering in Redis

Example analysis of master-slave replication, sentry, and clustering in Redis

1. Redis master-slave replication 1. Overview of master-slave replication Master-slave replication refers to copying data from one server to other Redis servers. The former is called the master node (Master), and the latter is called the slave node (Slave); data replication is one-way, and can only be from the master node to the slave node. By default, each Redis server is a master node; and a master node can have multiple slave nodes, but a slave node can only have one master node. [Related recommendation: Redis video tutorial] 2. The role of master-slave replication ● Data redundancy: Master-slave replication implements hot backup of data, which is a data redundancy method in addition to persistence. ●Failure recovery: When a problem occurs on the master node, the slave node can provide services to achieve rapid fault recovery.

May 29, 2023 pm 01:52 PM
redis
How to implement the demo of springboot+mybatisplus+redis

How to implement the demo of springboot+mybatisplus+redis

1.pom.xml中倒入需要的jar包4.0.0org.examplespringboot_redis_demo1.0-SNAPSHOTorg.springframework.bootspring-boot-starter-parent2.5.0org.springframework.bootspring-boot-starter-web2.5.0mysqlmysql-connector-java8.0.25org.springframework.bootspring-boot-starter-

May 29, 2023 pm 12:43 PM
redis SpringBoot mybatisplus
How to configure single instance redis in Linux

How to configure single instance redis in Linux

Introduction to redis Redis is an advanced key-value database. It is similar to memcached, but data can be persisted and supports a wide range of data types. There are strings, linked lists, sets and sorted sets. It supports calculating the union, intersection and complement (difference) of sets on the server side, and also supports a variety of sorting functions. So Redis can also be regarded as a data structure server. PS: This installation uses redis to store strings to store user sessions. Installation planning software package storage location: /usr/local/src Software package compilation location: /usr/local/src/redis-x-x/software installation location

May 29, 2023 am 11:58 AM
Linux redis
What are the common key-value designs of Redis databases?

What are the common key-value designs of Redis databases?

User login system is a system that records user login information. We simplify the business and only leave one table. Design of relational database mysql>select*fromlogin; +---------+----------------+---------- --+---------------------+ |user_id|name|login_times|last_login_time| +---------+----- ----------+-------------+-------------------

May 29, 2023 am 11:50 AM
redis
How to solve the error when springboot configures redis project startup

How to solve the error when springboot configures redis project startup

Error when configuring the redis project in springboot. When I first started learning redis, I followed the online tutorials to integrate redis and jedis into springboot. After the integration, the project always failed to start and the following error always appeared: Correcttheclasspathofyourapplicationsothatitcontainsasingle,compatibleversionoforg. springframework.data.repository.config.RepositoryConfigurationSource****

May 29, 2023 am 11:25 AM
redis SpringBoot
How does SpringSession count the number of online users through Redis?

How does SpringSession count the number of online users through Redis?

Because the original logic of the system is to use SpringSession plus session sharing by Redis to implement single sign-on. After logging in, a key value will be set in the session to indicate that the user has logged in. At the same time, HttpServletRequestWrapper will be rewritten to set the remoteUser data value classRemoteUserRequestWrapperextendsHttpServletRequestWrapper{StringuserCode;RemoteUserRequestWrapper( HttpServletRequestrequest){

May 29, 2023 am 10:52 AM
redis springsession
How to quickly install Redis and set up self-starting

How to quickly install Redis and set up self-starting

Analyze two relatively practical solutions: One is to install redis through docker and hook the configuration file to the local file through the data volume. The second is to use shell scripts to help us complete these mechanized operations. The first type is very unfriendly to novices. You need to consult more information and try more mistakes. If you are eager to complete the task, it will cause you more trouble. In order to really help everyone, this article will talk about the second type and go directly to the topic. To write a script, first enter any directory on the server and execute the following command: viredis-install.sh to enter the vi editor, click i to open the editing mode, and paste the following code into it (change the version and installation directory according to your needs): #!/

May 29, 2023 am 10:43 AM
redis
How to use Python to operate Redis under Windows

How to use Python to operate Redis under Windows

First, let’s talk about installing redis under windows. The installation package can be found on the official website. You can download the msi installation file or the zip compressed file. After downloading the zip file, unzip it. After unzipping, there are these files: The windowsservicedocumentation.docx inside is a document with installation instructions and usage methods. You can also directly download the msi installation file and install it directly. These files will also be in the installation directory after installation, and you can configure redis accordingly. After the installation is complete, you can test redis by double-clicking redis-cli.exe. If no error is reported, the local redis should be connected and simplified.

May 29, 2023 am 10:21 AM
Python Windows redis
What are the steps to install Redis on Linux system

What are the steps to install Redis on Linux system

I believe everyone has seen the red envelope grabbing activity at the 2021 Spring Festival Gala. According to statistics, a total of 70.3 billion red envelope interactions and 1.221 billion viewers in the Spring Festival Gala live broadcast room during the Spring Festival Gala. Faced with such a huge traffic, the self-developed volcano engine was tested. The redis system plays an important role in this. Introduction to Redis: Redis is completely open source, complies with the BSD protocol, and is a high-performance key-value database. Redis and other key-value cache products have the following three characteristics: Redis supports data persistence, and can save data in memory to the disk, and can be loaded again for use when restarting. Redis supports more than just simple k

May 29, 2023 am 10:01 AM
Linux redis
How to solve the error when installing redis6.0.6 on Centos

How to solve the error when installing redis6.0.6 on Centos

The error content is as follows: Infileincludedfromserver.c:31:0:server.c:4999:59:error:‘structredisServer’hasnomembernamed‘cluster’(server.cluster_enabled&&nodeIsMaster(server.cluster->myself)));. . . . . . Reason: In versions after redis 6.0.0+, compiling redis needs to support the C11 feature, which was introduced in 4.9. Centos7 default gc

May 29, 2023 am 10:01 AM
redis CentOS
How does redis solve inventory concurrency issues and achieve quantity control?

How does redis solve inventory concurrency issues and achieve quantity control?

Redis is a single process and blocking type. It can only process one request at the same time, and subsequent requests need to be queued and waited. Advantages: Because it is a single process, there is no need to deal with concurrency issues, reducing system complexity Disadvantages: Not suitable for caching large-size objects (more than 100kb) Reason: Since Redis only uses a single core, and Memcached can use multiple cores, on average each core Redis has higher performance than Memcached when storing small data. For data of more than 100k, the performance of Memcached is higher than that of Redis. Although Redis has also optimized the performance of storing big data, it is still slightly inferior to Memcached. memcache is multi-process,

May 29, 2023 am 09:52 AM
redis

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