Fine grit document and catalogs version management method based on snapshot
Title：
Fine grit document and catalogs version management method based on snapshot
Application Number：
 200710177065
Application Date：
 2007/11/09
Announcement Date：
 2008/04/16
Pub. Date：
Publication Number：
 101162469
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 G06F 17/30
Applicant(s)：
 Tsinghua University
Inventor(s)：
 Shu Jiwu, Xue Wei, Xiang Xiaojia
Key Words：
 Fine grit document, catalogs version, management method, snapshot
Abstract：
 The present invention relates to a fine-granularity files and directory edition management method based on snapshots, belonging to the multi-version document system field. The present invention separates a name space consisting of files and dirnames in a whole file system from an edition space representing the generating periods of different editions, and adopts relatively independent strategies to execute management, forming a hierarchical two-dimensional structure, i.e. forming a hierarchical structure from a root directory to a file in the name space; in the edition space, the editions of files and directory are organized through an index structure chronologically, forming a hierarchical structure in the edition space. The retrieval of the name space adopts an index strategy based on dynamic hash. The retrieval of the edition space adopts an index strategy based on a red-black tree. The directory edition and file edition respectively adopt a red-black tree structure variant aiming at the respective characteristics. The present invention can greatly improve the usability and the performance of the system, and controls the amount of consumption of time and space resulting from the maintenance of historical editions in an acceptable scope.
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