Patent ID: 6571278
Filing Date: 2003-05-27
Classification: H04L,Y10S

Abstract:
A computer for maintaining consistency of replica contents by interchanging data modification with another computer, said computer comprising:a replica including shared data; a receiver for receiving, from said another computer, a modification request for data included in said replica, wherein said modification request includes: a designation indicating no restriction for a modification order; a first designation indicating that after all modification requests preceding a current modification request have been affected by said replica, said replica is to be updated in accordance with said current modification request; a second designation indicating that modification requests following a current modification request are to be affected by said replica after said replica has been updated in accordance with said current modification request; or a third designation indicating that after all modification requests preceding a current modification request have been affected by said replica, said replica is to be updated in accordance with said current modification request, and that all modification requests following said current modification request are to be affected by said replica after said replica has been updated in accordance with said current modification request; and a controller for controlling, regardless of a receiving order of said modification request, for each receipt of said modification request, a timing of update execution for said replica in accordance with the received modification request by using information included in said modification request.