SAVING METHOD APPLIED TO DISTRIBUTED FILE SYSTEM, APPARATUS AND DISTRIBUTED FILE SYSTEM

摘要

A saving method applied to a distributed file system, saving apparatus, system thereof and computer storage medium thereof. Receiving a change record of metadata in real time by means of presetting a saving snapshot period, a current bitmap and a snapshot bitmap, and updating the corresponding current bitmap in real time according to the change record (S11); when determining that the saving snapshot period has been reached (S13), replacing the snapshot bitmap with the updated current bitmap to obtain a new current bitmap and a new snapshot bitmap (S15); and saving according to the new snapshot bitmap, while starting to record a new change record of the metadata again using the new current bitmap (S17). That is to say, the saving period is prolonged by means of regularly saving, so that the same record or file block only needs to be saved once within a period, and sequence writing is performed from top to bottom using a batch mode and according to priority, thereby increasing the degree of aggregation of files, reducing the amount of saved IO data, and ensuring completeness and accessibility of data.