CN102387220A - Offline downloading method and system based on cloud storage - Google Patents
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Abstract
The invention provides an offline downloading method based on cloud storage and a corresponding system which replaces a user to finish actual downloading work. A downloaded file can be permanently stored in the offline downloading system locally; and even if a source uniform resource locator (URL) of the file fails, a user can still acquire the file by submitting a downloading request to the offline downloading system; therefore, the permanent validity of downloading is guaranteed and a work flow on the system side is totally transparent to the user. Furthermore, after the offline downloading method based on the cloud storage and the corresponding system are used for finishing the actual downloading work, the user is informed of downloading the file to a local computer of the user through a high speed channel between the user and the offline downloading system; and a high data transmission speed is guaranteed.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an offline downloading method and system based on cloud storage.
Background
Downloading is the act of copying data from a computer on a network to a local computer. File downloading is a well-established technology on a personal computer, and a user downloads a file of interest to the user from a network and stores the file in the personal computer. There are three main downloading techniques in the internet: server download P2S, peer-to-peer download P2P, and intelligent grid P2 SP.
P2S refers to a download technology in which a user computer requests a download from a server and copies data on the server to the user computer via a protocol. P2S includes both HTTP and FTP protocols.
In the P2P download mode, all the user computers participating in the download also play the role of providing the download, i.e. uploading at the same time. For a complete resource, many data blocks may be included. When many users download the same resource, the obtained data blocks are different, so that each user computer can provide the data which is existed by itself to other computers without the data for downloading. With sufficient network bandwidth, the more computers participating in the download, the faster each computer can download the resource.
The P2SP integrates the advantages of the two downloading modes of P2S and P2P, and integrates the originally isolated server, the mirror image resource of the server and the P2P resource through the bridge of the multimedia retrieval database. Therefore, the downloading speed is higher, meanwhile, the downloading resources are richer, and the downloading stability is stronger.
However, in any of these downloading methods, the conventional downloading method is difficult to maintain continuous high-speed downloading during the downloading process due to the complexity of the network environment, and takes a long time. In addition, if a download URL link fails, it is likely that the desired file will no longer be available for download, and the download link will not be guaranteed to be permanently valid.
And the personal computer is generally fixed, can not surf the net at any time and any place, along with the technological progress, the mobile communication equipment terminal has already had the function of browsing the webpage, and more users visit the website at any time and any place through the mobile communication equipment terminal. However, there still exists a great problem in downloading files through a mobile communication device terminal. The biggest problem is that the mobile communication equipment terminal is connected with the network through a narrow band, so that the speed of downloading the file is slow. Meanwhile, in the current communication environment, the website is accessed through the mobile communication network, the flow generated by the user downloading is directly hooked with the telephone charge, and if the downloaded file is large, the required cost and money are more.
Disclosure of Invention
The invention aims to solve the technical problems of high downloading speed and permanent effectiveness of the file to be downloaded so as to improve the user experience of downloading. In order to solve the above problems, the present invention provides an offline downloading method based on cloud storage and a corresponding system thereof, wherein a server establishes a dedicated offline downloading system, and when a user wants to download a file, the user only needs to submit a downloading request to the offline downloading system, and the offline downloading system completes the downloading work of time.
The invention provides an offline downloading system based on cloud storage, which comprises a user system, a distributed downloading system, a cloud storage system and a CDN system, wherein the user system comprises a user information list and a downloading task information list.
The user information list records information of each registered user, the recorded information of the registered users comprises a unique identifier of the user, a storage path of a user private space in the cloud storage system, the total capacity of the user private space in the cloud storage system, and the current residual capacity of the user private space in the cloud storage system.
The download task information list records information of each download task, and the recorded information of the download task comprises a unique identifier of a user submitting the download task, a link of a download address of the download task, and a download state of the download task.
Wherein the download status includes not downloaded, downloading in progress, downloading completed and downloading failed.
The distributed downloading system comprises a task scheduling server and a downloading server cluster. Wherein,
and the task scheduling server records the load state of the download server cluster in real time, and each download server in the download server cluster executes an actual download task.
And the cloud storage system is in data communication with other systems through a cloud storage system interface. The cloud storage system adopts a GFS architecture, and each registered user has a corresponding private storage space in the cloud storage system.
The CDN content delivery system comprises a CDN scheduling server and CDN edge nodes, wherein the CND edge nodes are in data communication with the cloud storage system through the cloud storage system interface, and the CDN scheduling server is in data communication with each user.
In addition, the invention also provides an offline downloading method based on cloud storage, which is characterized by comprising the following steps:
a user system receives a downloading request submitted to the user system by a user;
the user system converts the received downloading request into a downloading task and stores the downloading task into a downloading task information list;
the task scheduling server acquires a new downloading task from the user system and distributes the acquired new downloading task to the downloading server;
the task scheduling server updates the task state of the download task which is already allocated to the download server in the download task information list in the user system to be 'downloading';
the download server executes actual download work;
after finishing the designated downloading work, the downloading server stores the downloaded file into the cloud storage system;
after finishing the appointed downloading work, the downloading server sends the downloading finished information to the task scheduling server;
after receiving the information of finished downloading, the task scheduling server updates the task state of the finished downloading task in the downloading task information list in the user system to 'finished downloading';
the user obtains the file requested to be downloaded through the user system.
Preferably, the task scheduling server obtains the size of the file to be downloaded according to the obtained downloading task, the task scheduling server logically divides the file to be downloaded into N segments, and selects N downloading servers with relatively least current load tasks from the downloading server cluster;
preferably, the N download servers respectively receive the N corresponding download tasks allocated by the task scheduling server;
preferably, after receiving all the N download tasks, the task scheduling server updates the task state of the completed download task in the download task information list in the user system to "download completed";
preferably, the user system sends the ID of the downloaded file and the CDN scheduling address to a user, the user accesses the CDN scheduling server according to the CDN scheduling address, and the CDN scheduling server sends a CDN edge node address that meets the condition to the user;
preferably, the user sends the ID of the downloaded file to the received CDN edge node to obtain the file requested to be downloaded.
Preferably, the CDN edge node downloads the file requested to be downloaded from the cloud storage system through an interface of the cloud storage system, and caches the downloaded file in the CDN edge node after the download task is completed.
Compared with the prior art, the invention has the advantages that: the method for downloading the file offline and the corresponding system thereof provided by the invention replace a user to finish actual downloading work, the downloaded file can be permanently stored in the local of the offline downloading system, and even if the source URL of the file is invalid, the user can still obtain the file by submitting a downloading request to the offline downloading system. This ensures permanent validity of the download and the workflow on the system side is completely transparent to the user. In addition, after the off-line downloading method and the corresponding system thereof provided by the invention finish the actual downloading work, the user is informed, and the user downloads the file to the PC of the user by using the high-speed channel between the off-line downloading system and the user, so that the high speed of data transmission is ensured.
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In order that the invention may be readily understood, specific embodiments thereof will now be described with reference to the accompanying drawings.
Fig. 1 is an overall structure diagram of an offline downloading system based on cloud storage according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and preferred embodiments.
The invention establishes a special off-line downloading system at one side of the server, when a user wants to download a file, the user only needs to submit a downloading request to the off-line downloading system, and the off-line downloading system finishes the actual downloading work. After the off-line downloading system finishes the downloading work, the downloaded file is stored in the local of the off-line downloading system, and the user is informed that the downloading is finished and can obtain the file by the off-line downloading system. The user downloads the file to the local computer by using a high-speed transmission channel between the offline downloading system and the user.
Particularly, after the off-line downloading system finishes a downloading process, the stored downloading file is associated with the downloading URL, and the association relation is cached. In this way, when other users submit download requests for the URL again, the offline download system can find that the file to be downloaded is stored locally in the system, and then directly inform the user that the download is completed, and the user downloads the file to their own local computer using the high-speed transmission channel.
In the user system of the off-line downloading system based on the cloud storage, provided by the invention, two tables are maintained: a user information list and a download task information list. Wherein,
the user information list is a list in which a certain amount of private storage space is allocated to each registered user in the cloud storage system. The user information list records information of all registered users, and the information of each registered user is the following four-tuple:
<UserID、StorePath、TotalCapacity、RemainCapacity>
UserID: a user unique identifier;
StorePath: a user private space storage path in the cloud storage system;
TotalCapacity: the method comprises the steps that the total capacity of a user private space in a cloud storage system is large;
RemainCapacity: the current residual capacity of the user private space in the cloud storage system is large.
The downloading task information list is that after the user system receives the downloading request submitted by the user, the request is converted into a downloading task to be stored in the task information list. The information of each download task is the following triplets:
<UserID、URL、State>
UserID: submitting the unique user identifier of the download task;
URL: downloading an address link;
state: the status of the task is downloaded. The downloading task is divided into four states in the whole downloading process: "not downloaded", "downloading in", "downloading completed", "downloading failed".
The distributed downloading system of the off-line downloading system based on the cloud storage is composed of a single task scheduling server and a downloading server cluster. Each download server in the download server cluster executes the actual download job, and each download server has an upper limit of the download task to be undertaken. The task scheduling server records the load condition of each download server in real time.
The task scheduling server acquires a task with an 'un-downloaded' state from a user system downloading task information table at regular time, acquires the size of a file to be downloaded according to a downloading address link URL, logically divides the file into N file blocks, selects N downloading servers with the lightest load (the current born downloading task is relatively least) according to the recorded load condition of each downloading server, assigns the acquired task to the N downloading servers, and each downloading server is responsible for the actual downloading of one file block (fragment). After the task assignment is finished, the scheduling server updates the state of the downloading task to 'downloading' in the user system task information table. And after the actual downloading of the fragments is finished by the downloading server, feeding the result back to the scheduling server. And only when the downloading of all the fragments is successful, the scheduling server updates the downloading task state in the task information table to be 'downloading completed', otherwise, the downloading task is marked as 'downloading failure'.
Each download server in the download server cluster is responsible for the actual download job. For a downloading task, a downloading server is responsible for downloading a logic fragment of a file to be downloaded; according to the real-time scheduling of the task scheduling server, a single download server can bear a plurality of download tasks, but the total number of the tasks cannot exceed the preset upper limit. After the downloading server finishes downloading the logic fragment of each task, the task scheduling server is informed that the downloading of the fragment is finished, and the downloaded data is written into a corresponding user private storage space in the cloud storage system by using an interface provided by the cloud storage system.
The cloud storage system of the off-line downloading system based on the cloud storage is a file storage warehouse, and files downloaded by the off-line downloading system are stored in the cloud storage system. The cloud storage system uses a GFS architecture, an excellent backup mechanism and a disaster recovery mechanism are arranged inside the cloud storage system, and the backup mechanism and the disaster recovery mechanism are transparent to the outside. And the external system performs data reading and writing interaction with the cloud storage system by using an I/O interface provided by the cloud storage system.
The CDN content distribution system of the off-line downloading system based on the cloud storage, provided by the invention, distributes the downloaded files to the CDN edge node closest to the user, so that the user can access the files nearby.
A preferred off-line download procedure of the present invention is as follows:
the user submits a download request to the user system in the offline download system, assuming the download address is linked to a URL. The user system converts the download request into a download task and stores the download task in the download task information table.
The task scheduling server in the off-line downloading system obtains a new downloading task from the user system, obtains the size of a file to be downloaded through a downloading link URL, logically divides the file into N fragments, selects N downloading servers with relatively least current load from a downloading server cluster according to a self scheduling mechanism, respectively assigns the downloading tasks of the N fragments to the N downloading servers, and updates the task state in a downloading task information table of the user system to be 'downloading in the process'.
And the N download servers execute actual download work, after each download server finishes downloading the designated fragments, the fragment data is written into the cloud storage system through the cloud storage system interface, and the download results are fed back to the task scheduling server.
After all the fragments are downloaded successfully, the files required to be downloaded by the user are also stored in the cloud storage system. And the task scheduling server updates the task state in the downloading task information table to be 'downloading completed'.
The user system provides the ID of the downloaded file and the CDN scheduling address to the user 1, the user 1 accesses the CDN scheduling server according to the scheduling address to request a CDN edge node which is closest to the user and has the most ideal load condition, and the CDN scheduling server informs the user of the address of the CDN edge node meeting the condition.
And the user sends the ID of the downloaded file to the designated CDN edge node and asks for the file. And if the CDN edge node does not have the cache of the file, downloading the file from the cloud storage system by using an interface of the cloud storage system through a high-speed channel, caching the file in the local of the CDN edge node after downloading, and then pushing the file to a user. At this time, the whole off-line downloading process is completed, and the user obtains the desired downloaded file.
The foregoing detailed description has been presented in conjunction with specific embodiments of this invention, but is not intended to limit the invention thereto. Any simple modifications of the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. An offline download system based on cloud storage, the system comprising:
a user system, a distributed download system, a cloud storage system, and a CDN content delivery system, wherein,
the user system comprises a user information list and a download task information list, wherein the user information list records the information of each registered user, and the download task information list records the information of each download task;
the distributed downloading system comprises a task scheduling server and a downloading server cluster, wherein the task scheduling server records the load state of the downloading server cluster in real time, and each downloading server in the downloading server cluster executes an actual downloading task;
the cloud storage system is in data communication with other systems through a cloud storage system interface, and each registered user has a corresponding private storage space in the cloud storage system;
the CDN content delivery system comprises a CDN scheduling server and CDN edge nodes, the CND edge nodes are in data communication with the cloud storage system through the cloud storage system interface, and the CDN scheduling server is in data communication with each user.
2. The cloud storage based offline download system of claim 1, wherein said recorded information of registered users comprises a user unique identifier.
3. The offline download system based on cloud storage according to claim 1, wherein the recorded information of the registered users further comprises a user private space storage path in the cloud storage system.
4. The offline download system based on cloud storage according to claim 1, wherein the recorded information of the registered users further comprises the size of the aggregate capacity of the user private space in the cloud storage system.
5. The offline download system based on cloud storage according to claim 1, wherein the recorded information of the registered users further comprises a current remaining capacity size of the user private space in the cloud storage system.
6. The cloud storage based offline download system of claim 1, wherein the recorded information of the download task comprises a unique identifier of a user submitting the download task.
7. The offline download system based on cloud storage according to claim 1, wherein the recorded information of the download task further comprises a link to a download address of the download task.
8. The offline download system based on cloud storage according to claim 1, wherein the recorded information of the download task further comprises a download status of the download task.
9. The offline download system based on cloud storage according to claim 8, wherein the download status of the download task comprises an un-downloaded status.
10. The offline download system based on cloud storage according to claim 8, wherein the download status of the download task further comprises a status under download.
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