Multilevel cache system, access control method and device thereof and storage medium

The invention relates to the technical field of cloud storage, in particular to a multi-level caching system and an access control method and device thereof and a storage medium. The method comprisesthe following steps: accessing a first-level cache in response to receiving a data request; under the condition that the requested data does not exist in the first-level cache, accessing the second-level cache; if there is the requested data in the second level cache, extending the expiration time of the requested data in the second level cache for a predetermined time. Through the embodiments ofthe invention, an optimized distributed storage technology can be provided, the cache efficiency is improved, and the cache capacity expansion cost is reduced. 本公开涉及云存储技术领域，特别涉及一种多级缓存系统及其访问控制方法、设备和存储介质。所述方法包括：响应于接收到数据请求而访问一级缓存；在一级缓存中没有所请求的数据的情况下，访问二级缓存；在二级缓存中存在所请求的数据的情况下，将二级缓存中的所请求的数据的过期时间延长预定时间。通过本公开的各实施例，可以提供一种优化的分布存储技术，提高缓存效率，降低缓存扩容成本。