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Technical Articles

Database

Redis

How springboot integrates redis and generates a globally unique index ID

springboot integrated redispom file org.springframework.bootspring-boot-starter-data-redisapplication.yaml file spring:#redis cache redis:connect-timeout:180000#Connection timeout time lettuce:pool:#Maximum number of connections in the connection pool max-active: 8#Maximum blocking waiting time (negative number means no limit)max-wait:1#Maximum idle connection in the connection poolmax-idle:5#Minimum idle connection in the connection poolmin-idle:0#Single-machine mode

May 30, 2023 pm 11:01 PM

redis SpringBoot id

What are the methods for Linux command operation and redis installation?

Computer operating system: Windows 7, 8, 10, Database tomcat cache (redis)...1. If you install a virtual machine, you must exit Kingsoft Antivirus and 360 Protection (disable the vmware program) Command: General syntax: The command is not followed by ./ or ../ to indicate the current directory ../ represents the current directory ../ represents the previous directory/ represents the root directory clear screen disk management: lslist displays the data in the directory:-

May 30, 2023 pm 10:49 PM

Linux redis

How to add query function to redis in Node.js

An example: For a new module, we need to install the redis module in our project before it can be used. Command cnpminstallredis to create a new redis.js file. The code is as follows: //Introduce redis varredis=require("redis");//Create a redis client varclient=redis.createClient("6379","127.0.0.1");// Connection error handling client.on("error",function(er

May 30, 2023 pm 09:55 PM

Node.js redis

What is the principle of using Redisson red lock in Redis

Why use the red lock master-slave structure of Redis distributed locks? The simplest way to implement Redis distributed locks is to create a key in Redis. This key has an expiration time (TTL) to ensure that the lock will eventually be released automatically. Lose. When the client releases the resource (unlocks it), the key will be deleted. On the surface it seems to work well, but there is a serious single point of failure problem: what if Redis hangs? You might say that this problem can be solved by adding a slave node. But this usually doesn't work. In doing so, we cannot achieve exclusive use of resources, because Redis's master-slave synchronization is usually asynchronous. There is an obvious race condition in this scenario (master-slave structure): the client

May 30, 2023 pm 09:35 PM

redis redisson

How to operate redis and redigo in Go

Go-operate redis, install golang, and operate redis. There are multiple client packages such as redigo and go-redis. The one with the most stars on github is redigo. gogetgithub.com/garyburd/redigo/redisimport "github.com/garyburd/redigo/redis" The connection Conn interface is the main interface for collaboration with Redis. You can use the Dial, DialWithTimeout or NewConn function to create a connection. When the task is completed, the application The Close function must be called to complete

May 30, 2023 pm 09:25 PM

Go redis redigo

Why is Redis so fast?

Redis is a NoSQL database based on key-value pairs. Redis's Value can be composed of various data structures and algorithms such as String, hash, list, set, zset, Bitmaps, HyperLogLog, etc. Redis also provides key expiration, publish and subscribe, transactions, Lua scripts, sentinels, Cluster and other functions. Redis executes commands very quickly, and according to the official performance, it can reach 10w+qps. So this article mainly introduces how fast Redis is. The main points are as follows: 1. Development language Now we all use high-level languages for programming, such as Java, python, etc. maybe you will

May 30, 2023 pm 08:27 PM

redis

How to solve Redis serialization conversion type error

Cannotconvertvalueoftype'org.springframework.data.redis.core.convert.MappingRedisConverter'torequiredtype'org.springframework.data.redis.core.mapping.RedisMappingContext':nomatchingeditorsorconversionstrategyfound在setV

May 30, 2023 pm 08:26 PM

redis

How to enable IO multi-threading in Redis

Enable IO multi-threading. Before the "Redis6" version, Redis read, parsed, and executed commands in a "single thread". Starting from Redis6, IO multi-threading was introduced. The IO thread is responsible for reading commands, parsing commands, and returning results. After turning it on, it can effectively improve IO performance. I drew a schematic diagram for your reference. As shown in the picture above, the main thread and IO thread will jointly participate in the reading, parsing and result response of commands. But the one that executes the command is the "main thread". The IO thread is turned off by default. You can modify the following configuration in redis.conf to turn it on. io-threads4io-threads-do-readsyes "io-threads" is the number of IO threads (including the main thread), I recommend

May 30, 2023 pm 08:10 PM

redis

How to use Python to operate Redis database

Introduction Redis is an open source memory-based and persistent Key-Value database written in ANSIC language. It has rich data structures, transaction functions, and ensures the atomicity of commands. Because it is an in-memory database, reading and writing are very fast, with an evaluation rate of up to 10w/s, so it is generally used in fast data changes, real-time communication, caching, etc. But in-memory databases usually have to consider the memory size of the machine. Redis has 16 logical databases (db0-db15). Each logical database project is isolated and the db0 database is used by default. If you select the second database, pass the command select2, and you can specify the database when connecting in python. Common data structure String-string L

May 30, 2023 pm 07:57 PM

Python redis

How to use Node.js and Redis to implement addition, deletion, modification and query operations

What is Node.js Node.js is a JavaScript runtime environment built on the ChromeV8 JavaScript engine. It has the ability to run JavaScript code on the server side, allowing developers to easily build scalable web applications. Node.js provides a range of useful modules and libraries, such as the HTTP module, for handling network communication between servers and clients. What is RedisRedis is a memory-based data storage system that can be used to store and retrieve data at high speed, such as caches and message queues. Redis supports multiple data types, such as strings, lists, sets, etc., and provides various APIs to enable developers to

May 30, 2023 pm 07:37 PM

Node.js redis

How to implement redis cache

1. Use the Pagoda panel to build the WeQing server first. 2. Open PHP management, click Install Extension, and install the redis extension. 3. After installing the redis extension, open redis management and click Performance Adjustment to modify the port number, redis password and a series of other operations. 4. Log in to the WeQing backend, click site settings, find performance optimization in common tools, enter the performance optimization interface, and see if the PHP extension environment already supports redis. 5. Open the Weiqing code, location: /www/wwwroot/your site domain name/data/config.php, modify the code snippet, change mysql to redis and add the following code //--------- ----

May 30, 2023 pm 06:52 PM

redis

How to use redis session sharing with nginx+tomcat

Environment preparation 1. Prepare an nginx server ip192.168.1.133 port 81. Installation process: #First install dependencies: yum-yinstallgcc-c++yum-yinstallpcrepcre-develyum-yinstallzlibzlib-develyum-yinstallopensslopenssl—devel #Note: Installation of nginx is required Use root user to install #Create an nginx directory mkdir/usr/local/src/nginx #Enter the nginx directory cd/usr/local/src/nginx #Download or

May 30, 2023 pm 06:40 PM

redis nginx tomcat

Example analysis of Redis timeout troubleshooting

During the past two days of work, I suddenly received an alarm that Redis was down. At the same time, the group was also saying that a certain Redis connection had timed out. I thought there was a big problem at first, but who knew it would recover after a while. At that time, I logged into the server and checked the monitoring. Take a look at QPS for the first time: You can see that QPS is not high, but why did the data not be obtained for a period of time? Then continue to look at the cpu usage of Redis: you can see that the cpu is saturated, which can also explain why the graph is broken, because redis is single-threaded, and after using 100% of the cpu, it will not be able to process other commands, and zabbix will Unable to execute the info command to obtain qps. Then we already know that the problem is caused by saturation of CPU usage.

May 30, 2023 pm 06:31 PM

redis

How to implement Redis distributed lock and what are its application scenarios

Introduction Lock is a very common tool in the development process. You must be familiar with it, such as pessimistic lock, optimistic lock, exclusive lock, fair lock, unfair lock, etc. There are many concepts. If you don’t understand locks in Java, you can Refer to this article: Java "locks" that must be mentioned. This article is very comprehensive. However, for beginners who know the concepts of these locks, due to lack of practical work experience, they may not understand the actual usage scenarios of unlocking. In Java, thread safety can be achieved through three keywords: Volatile, Synchronized, and ReentrantLock. This part of knowledge will definitely be asked in the first round of basic interviews (you must be proficient in it). In a distributed system, these Java lock technologies cannot lock at the same time.

May 30, 2023 pm 05:55 PM

redis