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How to use Redis to like and cancel likes

Code implementation:/****@paramuserId the person who liked it*@paramtype the expression of liking and canceling the like*@paramtextId article ID*@paramentityUserId--the person who was liked, the author of the article*/privatevoidlike(longuserId,inttype ,inttextId,longentityUserId){redisTemplate.execute(newSessionCallback(){@OverridepublicObjectexecute(RedisOperationsope

May 27, 2023 pm 03:57 PM

redis

Why is single-threaded Redis faster?

Why is single-threaded Redis so fast? How fast is Redis? The official answer is that the read and write speed is 100,000/second. Would you be surprised if this was achieved in a single-threaded environment? Why is single-threaded? Is Redis so fast? The reasons are as follows: Pure memory operation: Redis is completely based on memory, so the read and write efficiency is very high. Of course, Redis has persistence operations, and the persistence operations are all fork child processes and utilization This is accomplished using the page cache technology of the Linux system and will not affect the performance of Redis. Single-threaded operation: Single-threading is not a bad thing. Single-threading can avoid frequent context switching, which will also affect performance. Reasonable and efficient data structure adoption

May 27, 2023 pm 03:49 PM

redis

There are several ways to persist redis

How many ways are there to persist redis? Answer: There are two main ways: 1) Snapshot persistence has been automatically enabled in the redis configuration file. The format is: saveNM means that if redis is modified at least M times within N seconds, redis will grab the snapshot to the disk. Of course, we can also manually execute the save or bgsave (asynchronous) command to make a snapshot 2) appendonlyfile AOF persistence has three modes in total, such as appendfsynceverysec, the default is to force writing to the disk once per second, appendfsyncalways forces writing every time a write operation is performed. Disk appendfsyncno completely depends on os and has the best performance

May 27, 2023 pm 03:28 PM

redis

How to use Redis to store friend relationships in python

　　I'vebeenthinkinglatelyabouthowperfectRediswouldbeforstoringa　　simplesocialgraph.Ipositedthatitwouldberelativelyfewlinesofcode,　　andthatit'dbecleancodetoo.Sohereitis:abasicsocialgraphbuiltonRedis.　　"""　　classFriendGrap

May 27, 2023 pm 03:19 PM

Pythonredis

How to use Springboot +redis+Kaptcha to implement the image verification code function

Background registration-login-modification of password generally requires sending a verification code, but it is easy to be attacked and maliciously called What is SMS-Email Bomber Mobile SMS Bomber is a method of sending unlimited SMS registration verification codes for various websites to mobile phones in batches and cycles. The loss caused by the company is 5 cents per text message. If it is swiped, you can calculate the email notification for free. But if it is swiped, the bandwidth, connection, etc. will be occupied, making it impossible to use it normally. How to avoid your website becoming a "broiler" Or is it being swiped? Add graphic verification code (developers) limit the number of single IP requests (developers) limit number sending (generally SMS providers will do this) There are always offense and defense, but it only increases the cost of the attacker, and the ROI is not worth it It’s natural to abandon the Kaptcha framework and introduce Google

May 27, 2023 pm 03:05 PM

redisSpringBootkaptcha

How to use SpringBoot + Redis to implement interface current limiting

Configuration First, we create a SpringBoot project, introduce Web and Redis dependencies, and consider that interface current limiting is generally marked through annotations, and annotations are parsed through AOP, so we also need to add AOP dependencies. The final dependencies are as follows : org.springframework.bootspring-boot-starter-data-redisorg.springframework.bootspring-boot-starter-weborg.springframework.bootspring-boot-starter-aop then prepare it in advance

May 27, 2023 pm 03:01 PM

redisSpringBoot

Example analysis of redis cluster principle

The principle of redis cluster If you rely on sentinels to achieve high availability of redis, and if you want to support high concurrency while accommodating massive amounts of data, you need a redis cluster. Redis cluster is a distributed data storage solution provided by redis. The cluster shares data through data sharding and provides replication and failover functions. Node A redis cluster consists of multiple node nodes, and multiple nodes are connected through the clustermeet command. The handshake process of the node: Node A receives the clustermeet command from the client. A sends a request to B based on the received IP address and port number. Send a meet message. Node B receives the meet message.

May 27, 2023 pm 02:55 PM

redis

How to install and run Redis as a non-root user under CentOS7

1. Basic environment information 1.1, environment information serial number ID version 1 operating system CentOS72 redis5.0.121.2, redis download address redis download address: we are using 5.0.122 here, install 2.1, create a new redis ordinary user 1), log in with root Our system 2), new group: groupaddredisgroup3), new user: useradd-gredisgroupredis4

May 27, 2023 pm 02:51 PM

redisCentOS

How to solve the Big Key problem in Redis

1. What is BigKey? To put it simply, BigKey means that the value corresponding to a certain key is very large and takes up a large amount of redis space. It is essentially a big value problem. The key can often be set by the program itself, and the value is often not controlled by the program, so the value may be very large. The values corresponding to these BigKeys in redis are very large and take a lot of time in the serialization/deserialization process. Therefore, when we operate BigKey, it is usually time-consuming, which may cause redis to block, thereby reducing redis performance. . Use several practical examples to describe the characteristics of big Key: ●A Key of String type, its value is

May 27, 2023 pm 02:41 PM

redis

How to install redis and php extensions under lunix

Install Redis First, you need to install Redis in the Linux system. The installation can be completed through the following command: sudoapt-getinstallredis-server After the installation is completed, you can use the following command to check whether the Redis service has been started: sudoserviceredis-serverstatus If the service has been started, results similar to the following will be output: redis-server.service -Advancedkey-valuestoreLoaded:loaded(/lib/systemd/system/redis-server.servic

May 27, 2023 pm 02:40 PM

PHPredisLunix

How to configure Redis high concurrency cache in SpringBoot

1. Introduce dependency org.springframework.bootspring-boot-starter-data-redis 2. Configuration #Start redis #redis database index (default is 0) spring.redis.database=2 #redis server address spring.redis.host= 127.0.0.1#Password (empty if not available) spring.redis.password=#The maximum number of connections in the connection pool spring.redis.jedis.pool.max-active=2000#The maximum blocking waiting time of the connection pool (use negative

May 27, 2023 pm 02:26 PM

redisSpringBoot

How SpringBoot integrates Redis to implement hotspot data caching

We use IDEA+SpringBoot as a test environment for integrating Redis in Java. First, we need to import Redis’s maven dependency org.springframework.bootspring-boot-starter-data-redis. Secondly, we need to configure your Redis configuration in the configuration file. Information, I am using the .yml file format #redis configuration spring: redis: #r server address host: 127.0.0.1 # server port port: 6379 # database index (default 0) database: 0 # connection timeout (milliseconds) timeo

May 27, 2023 pm 02:07 PM

redisSpringBoot

How to implement Nginx proxy Redis sentinel master-slave configuration

1. Environment Nginx version: 1.21.6Center7.5 and above or MasOS to build Redis Sentinel master-slave mode. Springboot integrates Redis Sentinel master-slave mode. Tip: Nginx must install the upstream module. 2. There are three options for configuring Nginx configuration (see the following content for details). Among them: Option 1 uses one port for all sentinel nodes to be mapped externally; Option 2 is to configure a corresponding mapped port for each sentinel port, which is generally the same as the normal sentinel configuration; Option 3 is actually a combination of Option 1 and Option 2. Personally, I don’t think it makes much sense, and interested friends can try it on their own. 2.1. Solution 1 (recommended) #stream module configuration and http

May 27, 2023 pm 02:03 PM

redisnginx

How to solve the two abnormal situations of Redis command timed out

Rediscommandtimedout After the SpringBoot project introduced Redis, I found that occasionally the connection would time out Rediscommandtimedout. I read many articles on the blog and they all said that the problem can be solved by setting the timeout. This problem still occurs after trying it. In fact, it still happens no matter how long you set it. time out. The reason is that after springboot2.x, the Redis client used by springboot by default is lettuce, not jedis, lettuce connection pool. org.springframework.dao.QueryTimeoutException

May 27, 2023 pm 01:58 PM

redis