Redis实现文件系统存储（redis文件存储）
Many application development scenarios require dynamic databases that read, write and query quickly. Nowadays, Redis has become a popular key-value storage system. It is a NoSQL database that not only supports operations on strings, but also complex operations such as lists, sets and sorted sets. In this paper, an application system based on Redis is designed to realize the storage of file system.
The system is based on Redis and provides four kinds of data structures, namely hashes, strings, lists, and sets. The hashes are used to store the file system structure, to record the size of each directory and the subdirectories, the strings of the records, and each of the filesTo store meta information such as Get Full Path, modified time, etc; list type to store file system hierarchy; through set to store the storage files and their relative paths.
To implement the file/directory operations (e.g., create, update and delete) in the file system, corresponding Redis commands can be used according to the above data structure design. For example, when creating a directory, the system will first create a record in the hash type, and then make it belonging to the relevant parent directory by adding its name to the list type of the parent directory. On the other hand, use the SET type to store the file data and the parent directory path of the file. The above three types of data structure are all for binary storage, so in addition to using the set type to store the file data and the parent directory path, the file meta information should be stored as a hash type separately.
The commands used in the file system implementation can be summarized as follows:
• Hash command: hset, hget, hgetall
• List command: rpush, lpush, lrange
• Set command: sadd, srem
The complete system based on Redis works very stable. Whatever the file system operation, Redis can handle it quickly, providing a higher performance than conventional file system. Besides, it only needs very little space to store the file system meta information and the file data, thus making Redis a better solution for file system storage application.
