The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 2000
Filed:
Apr. 02, 1998
John H Howard, Cambridge, MA (US);
Mitsubishi Electric Information Technology Center America, Inc. (ITA), Cambridge, MA (US);
Abstract
A file reconciliation process in a distributed file system uses a set of rnal or log files to track the history of file modification at each of different sites, or sets of directories, in a computer system. During reconciliation, sequences of version entries associated with each file in each journal are updated and compared to determine whether (1) a conflict exists for any of the files involved in the reconciliation, and (2) if not, which version of the file is the current version. The version entries contain a hash code or digest that to a high probability uniquely identifies the contents of a file. Sequences of hash codes are used to identify the sequence of file versions. Masks and site indicator fields are included in the journal files and used to track which journal files have copies of version entries for the purpose of deleting version entries when they become obsolete.