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How to use Redis as a global lock in SpringBoot

1. Simulate resource competition without lock publicclassCommonConsumerService{//Number of inventory staticintgoodsCount=900;//Number of sales staticintsaleCount=0; publicstaticvoidmain(String[]args)throwsInterruptedException{for(inti=0;i{try{ Thread.sleep(2);}catch(InterruptedExceptione){}if(goodsCount>0){

May 29, 2023 pm 07:13 PM

redisSpringBoot

How to understand the Linux system connection Redis command

Redis can support the following connection methods: connection through client tools, connection through database management tool DMC, etc. Connect to remote redis-cli-h47.101.63.222-p56379 Connect to local redis-cli Set password configsetrequirepasspass_123456 Get password configgetrequirepass Login authpass_123456

May 29, 2023 pm 06:52 PM

Linuxredis

redis single node instance analysis

1.安装jdk1.8[root@sht-sgmhadoopdn-04~]#cd/usr/java/[root@sht-sgmhadoopdn-04java]#wget--no-check-certificate--no-cookies--header"Cookie:oraclelicense=accept-securebackup-cookie"http://download.oracle.com/otn-pub/java/jdk/8u111-b14/jdk-8u111-li

May 29, 2023 pm 06:46 PM

redis

How SpringBoot integrates Redis using @Cacheable and RedisTemplate

Made some very simple optimizations to the previous website and added a paging function to the user list. It is better to consider the loading speed when paginating. If you have to wait a few seconds to change a page, the experience will be very poor. So I thought of adding a redis cache. There are two ways for springboot to integrate redis: first, use annotations, @EnableCaching@Cacheable... etc. Second, use RedisTemplate. Both can operate the cache. Using RedisTemplate is definitely more flexible and convenient than using annotations. But in theory, the annotation method should be faster, because if the annotation is in the cache, it will be fetched directly from the cache without entering the method. And RedisTe

May 29, 2023 pm 06:19 PM

redisSpringBoot@cacheable

How SpringBoot integrates Redis operation API

SpringDataRedis calls the underlying interpretation of Redis. Before SpringBoot2. Pool; BIOlettuce: Netty is used as the bottom layer, and instances can be shared between multiple threads. There is no thread insecurity and the number of threads can be reduced; NIO SpringBoot integrates Redis (source code analysis). All SpringBoot configuration classes have an automatic configuration class. Automatic configuration classes will be bound to a p

May 29, 2023 pm 06:19 PM

APIredisSpringBoot

How to solve php redis data loss

Solution to phpredis data loss: 1. Find "/etc/sysctl.conf"; 2. Add "vm.overcommit_memory=1"; 3. Use "sysctl-p" to make the configuration take effect; 4. Restart the Linux server. The direct solution to the loss of redis data after the Linux server is restarted: 1. Find /etc/sysctl.confvim/etc/sysctl.conf 2. Add vm.overcommit_memory=13.wq to the last line to save, and use sysctl-p to make the configuration effective sysctl -p will return the added line, indicating that the addition was successful.

May 29, 2023 pm 06:16 PM

PHPredis

What is the use of slowlog in Redis?

Slowlog is the logging system used by Redis to record query execution time. Note that this query execution time does not include IO operations such as client response (talking) and sending replies, but only the time spent executing a query command. Slowlog is stored in memory and has very fast read and write speeds, so we can use it with confidence and don't have to worry about damaging the speed of Redis by turning on slowlog. Slowlog has two important configurations. We first use the CONFIGGETslowlog-* command to view the existing configuration. slowlog-log-slower-than represents the slow query threshold, in microseconds. When executing query command

May 29, 2023 pm 05:29 PM

redisslowlog

What are the principles and usage of Redis type and encoding encoding?

Abstract Redis is an open source, high-performance key-value database that is widely used in various scenarios. In Redis, data type (type) and encoding (encoding) are very important concepts. This blog will introduce in detail the data types supported by Redis as well as the corresponding encoding methods and underlying implementation principles. To view the internal encoding of a Redis key, you can use the Redis command OBJECTENCODINGkey. Among them, key is the key name you want to query. For example, if you want to query the internal encoding of a key named mykey, you can execute the following command: 127.0.0.1:6379>objectencodin

May 29, 2023 pm 04:21 PM

redistypeencoding

How to install Another Redis Desktop Manager

AnotherRedisDesktopManager Brief Description AnotherRedisDesktopManager is a faster, better and more stable Redis desktop manager, compatible with Linux, Windows and Mac. Also, it doesn't crash when loading a large number of keys. Installation of software and tools such as AnotherRedisDesktopManager is very simple and easy to operate. 1. Install #clonecodegitclonehttps://github.com/qishibo/AnotherRedisDesktopManager on Mac or Linux.

May 29, 2023 pm 03:22 PM

redisdesktopmanager

How to solve common problems of caching data based on Redis

1. Cache penetration 1.1 Problem description Cache penetration is to request a non-existent key on the client/browser side. This key does not exist in redis, and there is no data source in the database. Every request for this key If it cannot be obtained from the cache, the data source will be requested. If you use a non-existent user ID to access user information, it does not exist in redis or the database. Multiple requests may overwhelm the data source. 1.2 Solution: There must be data that does not exist in the cache and cannot be queried, because the cache misses It is written passively and the cache does not exist. For fault tolerance reasons, data that cannot be queried will not be cached in redis. This will cause the database to be requested every time the data that does not exist is requested, losing the meaning of caching. (1

May 29, 2023 pm 03:07 PM

redis

How to use redis correctly in springboot

Redis implements data caching. In the project, some dictionary data, session data, and temporary data will be stored in redis. Redis is also supported in springboot. Generally speaking, multiple threads use one redis implementation to have threads. There are security risks, and each implementation of one thread is too wasteful of resources. It is very dangerous to be unable to control the number of threads, so some redis thread pool components have appeared. Let’s talk about the two main components. The main purpose of the jedis thread pool is that each instance has its own thread. The thread can obtain lettucelettuce from the pool it creates. Letcelettuce is a thread pool tool launched by Apache. Its redis instance can be used by multiple threads.

May 29, 2023 pm 03:07 PM

redisSpringBoot

What are the common Redis interview questions?

1. What is the full name of Redis? This question is probably ignored by many people, but I like it. The full name is RemoteDictionaryServer (remote data service). 2. Why doesn’t Redis officially provide a Windows version? Because the current Linux version is quite stable and has a large number of users, developing the Windows version requires more energy and will cause compatibility and other issues. Moreover, Linux has an advantage over Windows in IO model selection. We generally develop on Windows, and it is recommended to deploy on Linux for production environments. Although Microsoft officially provides a Windows version of redis branch based on the open source of Redis.

May 29, 2023 pm 02:58 PM

redis

How to compile and install redis5.0.3 in Linux-centos7

1. Obtain the installation package https://blog.csdn.net/ct_666/article/details/111519155 to obtain the source code package. If there are no special requirements and you must use the new version features, then version 5.0.3 is sufficient. cd/usr/local/&&wgethttp://download.redis.io/releases/redis-5.0.3.tar.gz2. Decompress and compile. If the server does not have the gcc-c++ compilation environment installed, please refer to

May 29, 2023 pm 02:28 PM

LinuxredisCentOS

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