Data processing method, device and system for distributed storage system

The invention provides a data processing method, device and system for a distributed storage system. The method comprises the following steps: obtaining a first mode structure of target data and a second mode structure of source data; processing the source data into structured data of the first mode structure according to the first mode structure and the second mode structure. According to the data processing method, device and system, the problem of inflexible description of data mode structures in a distributed storage system in a related technology is solved; the data processing method, device and system have the benefits that the description flexibility of the data mode structures is improved, so that the data processing efficiency is improved.