DATA SEGMENTATION USING SHIFT-VARYING PREDICATE FUNCTION FINGERPRINTING
First Claim
1. A method of segmenting data for data processing, the method comprising:
- initializing a data buffer including input data;
specifying a first value of a sliding window position in the data buffer;
selecting a portion of the input data corresponding with the sliding window;
determining if the sliding window position should be a segment boundary based on the selected portion of the input data and the first value of the sliding window position;
setting the segment boundary at the first value of the sliding window in response to the determination that the sliding window position should be the segment boundary; and
specifying a second value of the sliding window position in response to the determination that the sliding window position should not be the segment boundary.
19 Assignments
0 Petitions
Accused Products
Abstract
Shift-varying segmentation uses a shift-varying predicate function to evaluate input data within a sliding window to determine if the current sliding window position should be a segment boundary. The shift-varying predicate function is a function of both the input data within the sliding window and the position of the sliding window relative to a previous segment boundary or the beginning of the input data. The shift-varying predicate function includes a containment property and may compute a hash value from the input data in the sliding window. The hash value is compared to a threshold value that is a function of the sliding window position. As the sliding window position advances away from a previous segment boundary, the probability of a segment boundary at the window position increases. Shift-varying segmentation can be used in compression, transaction acceleration, and data storage applications.
-
Citations
56 Claims
-
1. A method of segmenting data for data processing, the method comprising:
-
initializing a data buffer including input data; specifying a first value of a sliding window position in the data buffer; selecting a portion of the input data corresponding with the sliding window; determining if the sliding window position should be a segment boundary based on the selected portion of the input data and the first value of the sliding window position; setting the segment boundary at the first value of the sliding window in response to the determination that the sliding window position should be the segment boundary; and specifying a second value of the sliding window position in response to the determination that the sliding window position should not be the segment boundary. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
-
29. A computer readable storage medium including instructions adapted to direct a computer to perform an operation, the operation comprising:
-
initializing a data buffer including input data; specifying a first value of a sliding window position in the data buffer; selecting a portion of the input data corresponding with the sliding window; determining if the sliding window position should be a segment boundary based on the selected portion of the input data and the first value of the sliding window position; setting the segment boundary at the first value of the sliding window in response to the determination that the sliding window position should be the segment boundary; and specifying a second value of the sliding window position in response to the determination that the sliding window position should not be the segment boundary. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
-
Specification