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background The day before yesterday, my colleague reported that there was a problem with the redis distributed lock, resulting in duplicate order numbers. Later, everything was normal after it was replaced with reission. Based on this phenomenon, this paper analyzes it Problem driven The following code is analyzed and three problems are foun ...

preface Today, I'd like to share common problems and solutions when Redis is used as a cache. Solutions to problems such as cache penetration, cache failure (breakdown) and cache avalanche. 1, Cache penetration? Redis middleware is basically an indispensable element in high concurrency system design. There are some problems that we n ...

Forwarding official account: IT Ranch Tactical Analysis: There must be more than one timer in the actual development project, which needs to be used in many scenarios, and the problem brought by multiple timers is how to avoid the conflict of multiple timers Usage scenario: Our order service generally has an order to be paid, which has a ti ...

If you add, you have Clear cache. @Cacheable cannot set the expiration time directly. It should be used in combination with @ CacheConfig to set the expiration time Function description @The Cacheable annotation is used on a method to indicate that the return result of the method can be cached. That is, the returned result of this method wi ...

Tip: after the article is written, the directory can be generated automatically. Please refer to the help document on the right for how to generate it preface Today, let's introduce the data structures of redis and their usage scenarios. My level is limited. If you are misled, welcome to learn together and make progress together! 1, ...

As a memory based cache system, Redis has always been known for its high performance. Without context switching and lock free operation, even in the case of single thread processing, the read speed can reach 110000 times / s and the write speed can reach 81000 times / s. However, the single thread design also brings some problems to Redis: On ...

During the use of Redis client, whether the client is improperly used or the Redis server has problems, the client will respond to some exceptions. The following is an analysis of the common exceptions in the use of Jedis: 1, Unable to get connection from connection pool The number of Jedis objects in the JedisPool is limited. The default is ...

1. Project introduction This is a simple case based on Spring boot + Mybatis Plus + Redis. It mainly caches the activity content, prize information, record information, etc. into Redis, and then all lottery processes do data operations from Redis. The general content is very simple, and the specific operation is analyzed slowly below. 2. Pr ...

1. Introduction to redis Redis is the most widely used memory data storage in the industry. Compared with Memcached, redis supports richer data structures, such as hashes, lists and sets, and supports data persistence. In addition, redis also provides some database like features, such as transaction, HA and master-slave database. It can be said ...

The source code of this article comes from redis 6.2 link: https://github.com/redis/redis/tree/6.2 https://github.com/redis/redis/blob/6.2/src/sds.h https://github.com/redis/redis/blob/6.2/src/sds.c Introduction to sds sds (simple dynamic string) its full name is simple dynamic string. It uses C language to encapsulate a binary secure string ...