Data recovery method for distributed file system

Abstract

The invention provides a data recovery method for a distributed file system. The method comprises the steps that a core data structure with a recovery chain table as a recovery space is created, wherein the recovery chain table is provided with an overall pointer variable, and the overall pointer variable is used as a head pointer of the recovery chain table at the same time and named as a trash pointer; as a response to a received deleting instruction, generated by the system, for any one file with the file node type as a TYPE_FILE, a file name and a path of the file are recorded to a path ofa structure body fsedge, a file node is moved to the recovery chain table from a system file directory tree at the same time, the node type of the file is changed to a TYPE_TRASH from the original TYPE_FILE, and accordingly the trash pointer can access the file. According to the data recovery method, a recovery station mechanism of the file system is achieved through a separate TRASH module, andwhen all the files in the system are deleted, if the recovery time of the files is longer than 0, the files cannot be immediately and completely deleted, and nodes of the files are removed from the file tree and put in the recovery chain table.

Description

technical field [0001] The invention relates to the field of distributed storage, and belongs to a data recovery method of a distributed file system. Background technique [0002] Distributed file systems generally use redundancy to ensure data security. Although this method can largely avoid data loss caused by failure of some physical nodes, it cannot avoid file system user misoperations. data loss, for example: users delete files by mistake. [0003] The current mainstream distributed file system has introduced the data recycle bin function. The general practice of these systems is: when the recycle bin function is turned on, file data will be put into the recycle bin by the system whether it is deleted intentionally or unintentionally. For a period of time, if it is accidentally deleted, the user can restore the deleted file within this period. [0004] However, these distributed file system recycle bin functions generally have the following limitations: [0005] (1) ...

AI Technical Summary

Problems solved by technology

[0005] (1) The data put into the recycle bin cannot be accessed by the user. If the file data of user A is deleted by user B, but user A does not have the authority to restore the data, although the data of A will not be lost temporarily, A will no longer be able to access These data

[0006] (2) If a large number of files to be recycled have been piled up in the recycle bin, the user cannot conveniently view the status of the files in batches

[0007] (3) The recovery time of a file is set to 0, that is, it will not stay in the recycle bin after being deleted, but will be cleaned up by the system directly; at this time, if user A opens the file and user B deletes the file, operation conflict will occur

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