File version reconciliation using hash codes

Details File version reconciliation using hash codes File version reconciliation using hash codes

1998-04-02

2000-08-01

Amsbury, Wayne

Data processing: database and file management or data structures

Database design

Data structure types

707 6, 364228, 340172, G06F 1730

Patent

active

060980796

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.

REFERENCES:
patent: 3668647 (1972-06-01), Evangelisti et al.
patent: 5333315 (1994-07-01), Saether et al.
patent: 5754844 (1998-05-01), Fuller
patent: 5778068 (1998-07-01), Johnson et al.
patent: 5778393 (1998-07-01), Blea et al.

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