Author: Zen and the Art of Computer Programming
1 Introduction
Redis is an open source, high-performance key-value storage database. Redis provides a variety of data structures, such as String, Hash, List, Set, Sorted Set, etc.; it also provides support for transactions, LUA scripts, and publishing /Subscription, stream and other functions are supported. It is widely used in actual projects and can support cache, message queue, search by key, counter and other requirements in high concurrency scenarios.
With the development of Internet business, the number of website visits is increasing. A single server can no longer support such a large number of visits and needs to be expanded horizontally. In order to improve the processing capabilities of the website, Redis provides the Redis Cluster mode, which can form a cluster of multiple Redis nodes to achieve sharded storage of data and provide better horizontal scalability.
2. Advantages of Redis Cluster
2.1 Distribution
The cluster mode of Redis ensures the distributed nature of data storage. Each node in the Redis cluster is connected through the network, and data can be seamlessly stored in shards. Therefore, when a node fails, other nodes can still continue to provide services. In addition, Redis cluster provides some commands to operate all nodes in the cluster, making cluster management simple and easy to use.
2.2 Data redundancy
Redis cluster uses a master-slave replication mechanism to achieve redundant backup of data. If the master node fails, the Redis cluster can automatically elect a new master node and continue to provide services. Moreover, Redis cluster supports data read and write operations to ensure the ultimate consistency of data.