System and method for updating file

A file update system, comprising:

• a first and a second data server computers formed as pipe line type network for storing an original file and a duplicate file of the original file respectively, and for updating both the original file and the duplicate file in response to an update request, the update request includes update request information for indicating a message type, a file ID of the file to be updated, a client's IP address, an offset of a region to be updated, a length of the region to be updated and a serial number;
• wherein the client's IP address and the serial number are used to distinguish a plurality of update requesting messages for a same file in a data structure that is managed by the data servers;
• wherein the first and the second data server computers mutually exchange file update information, correct the file update information so as to prevent overlapped update due to a plurality of update requests for the same file, and then update the original file or the duplicate file according to the corrected file update information,
• wherein the file update information comprises an offset and length in regard to an identification (ID) of the original file to be updated.

A file updating method for storing an original file and a duplicate file of the original file respectively in a plurality of data server computers connected as a network shaped like pipe line, and updating the original file and the duplicate file of the original file so as to become the same image of the original file as the duplicate file, the method comprising:

• receiving the file update information in response to a plurality of update requests for the original file by one of the data server computers, wherein the update request includes update request information for indicating a message type, a file ID of the file to be updated, a client's IP address, an offset of a region to be updated, a length of the region to be updated and a serial number;
• wherein the client's IP address and the serial number are used to distinguish a plurality of update requesting messages for a same file in a data structure that is managed by the data servers;
• updating the original file or the duplicate file based on the changed file update information after determining file update order based on the update requests and changing the file update information according to the file update order so as not to update the same file as the updated file due to a plurality of update requests,
• wherein the updating of the original file comprises:
• determining whether regions of the original file to be updated are overlapped;
• changing offsets and lengths of the update requests so as to prevent that the regions are overlapped;
• generating temporary files corresponding to the update requests;
• exchanging, in the data servers, the changed offsets and lengths according to a pipeline order;
• and
• updating the original file using the temporary files according to the changed offsets and lengths.

A file updating method for storing an original file and a duplicate file of the original file respectively in a plurality of data server computers connected as a network shaped like pipe line, and updating the original file and the duplicate file of the original file so as to become the same image of the original file as the duplicate file, the method comprising:

• receiving the file update information in response to a plurality of update requests for the original file by one of the data server computers, wherein the update request includes update request information for indicating a message type, a file ID of the file to be updated, a client's IP address, an offset of a region to be updated, a length of the region to be updated and a serial number;
• wherein the client's IP address and the serial number are used to distinguish a plurality of update requesting messages for a same file in a data structure that is managed by the data servers;
• updating the original file or the duplicate file based on the changed file update information after determining file update order based on the update requests and changing the file update information according to the file update order so as not to update the same file as the updated file due to a plurality of update requests,
• wherein the file update information comprises an offset and length in regard to an identification (ID) of the original file to be updated.