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redis string source code analysis For details, please refer to the redis source code SDS H this file /* Note: sdshdr5 is never used, we just access the flags byte directly. * However is here to document the layout of type 5 SDS strings. */ /* In all structures: * len Indicates the length used * alloc Indicates the usable length * ...

redis is a high-performance NOSQL series non relational database NosQL(Not only sQL), "not just sQL", is a new database concept, which generally refers to non relational databases. With the development of internet web2 With the rise of 0 website, the amount of data is becoming larger and larger, especially the super large-scale and hi ...

At the beginning of this article, we will publish a series of articles to show you a go zero micro service example in detail. The whole series is divided into ten articles, and the directory structure is as follows: Environment construction (this paper) Service splitting User services Product service Order service Payment services ...

1, Why use distributed locks When developing applications, if we need multi-threaded synchronous access to a shared variable, we can use the Java multi-threaded processing we learned, and it can run perfectly without bugs! However, this is a stand-alone application, that is, all requests will be allocated to the JVM of the current server, and ...

The first part: the native jedis is connected to redis First, let's understand that we used jdbc to connect to the database when we used mysql. Similarly, when we connect to redis, we need to use jedis. Step 1: create a new java project and import the package New java project, import package <dependency> <groupId>redis.c ...

Redis and other key - value caching products have the following three characteristics: Redis supports data persistence. It can save the data in memory on disk and can be loaded again for use when restarting.Redis not only supports simple key value data, but also provides storage of list, set, zset, hash and other data structures.Redis supp ...

Basic concept and deployment of redis 1. Introduction to redis Redis is a NoSQL database based on key value pairs. Unlike many key value pair databases, the values in redis can be composed of string, hash, list, set, zset, geo and other data structures and algorithms. redis will put all data in memory, so its read-write performance is very f ...

Release confirmation Release confirmation principle The producer sets the channel to confirm mode. Once the channel enters the confirm mode, all messages published on the channel will be assigned a unique ID (starting from 1). Once the message is delivered to all matching queues, the broker will send a confirmation to the producer (including ...

preface Distributed locks are generally implemented in three ways: 1 Database lock; 2. Redis based distributed locks; 3. Distributed lock based on ZooKeeper. This blog will introduce the second way to implement distributed locks based on redis. Although there are various blogs on the Internet that introduce the implementation of redis distribu ...

ThreadLocal principle Before reading this article, you need to understand the concept of strong, weak and virtual in Java. The transmission address is: Detailed explanation of four references of strong, weak and virtual in Java 1, Introduction It can solve the data security problem of multithreading and associate the current thread with a ...