File partial modification method and system

Abstract

The invention discloses a method for partially modifying a file. The method comprises the steps of obtaining first content data corresponding to first part content data of a target file, copying all file content data in a first target stripe containing the first part of content data into an alternative stripe, replacing the first part of content data in the alternative strip with the first contentdata; selecting a target alternative stripe from the alternative stripes, encoding file content data in the target alternative stripe when a preset encoding condition is met to obtain second contentdata, and writing the second content data into an encoded data block of the target alternative stripe; and when writing is completed, replacing the first target strip with the target alternative stripto complete modification of the first part of content data in the target file. The modification method can be completed only in a file system, and has no requirement for the size of the target file.

Description

technical field [0001] The invention relates to the technical field of file processing, in particular to a method and system for partially modifying files. Background technique [0002] In the distributed file system, when the target file in the system needs to be modified, the target file is first stored in the local storage system, and after the storage is completed, the target file is partially modified, and uploaded to the distributed file after the modification is completed. In the traditional storage system, the above-mentioned file modification process is first processed in the local storage system, and then uploaded to the distributed storage system after processing. Two file systems need to be used to modify the target file. [0003] When the target file is very large, if the local storage system cannot store this very large file, then there will be a situation where the file cannot be modified, and the target file is first stored in the local storage system, then m...

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Problems solved by technology

[0004] In view of this, the present invention provides a method and system for partially modifying a file to solve the problem that the file cannot be modified if the local storage system cannot store the very large file when the target file is very large. Moreover, first store the target file in the local storage system, then modify it, and finally upload the file to the distributed storage system, which wastes system resources, increases the storage management cost of the application, and also increases the management overhead of the storage system.

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