CN102387220A - Offline downloading method and system based on cloud storage - Google Patents
Offline downloading method and system based on cloud storage Download PDFInfo
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- CN102387220A CN102387220A CN2011104329300A CN201110432930A CN102387220A CN 102387220 A CN102387220 A CN 102387220A CN 2011104329300 A CN2011104329300 A CN 2011104329300A CN 201110432930 A CN201110432930 A CN 201110432930A CN 102387220 A CN102387220 A CN 102387220A
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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 present invention relates to communication technical field, more specifically, relate to a kind of method and system thereof that downloads based on the off-line of cloud storage.
Background technology
Download is the behavior that the data in the computer on the network is copied to local computer.Being loaded on the PC under the file is mature technique very, downloads own interested file on the users from networks and is saved in PC.Download technology in the Internet mainly contains three kinds: service end is downloaded P2S, point-to-point download P2P and smart grid P2SP.
P2S is meant that subscriber computer downloads to server requests, and the data on the server is copied to the download technology of subscriber computer through agreement.P2S comprises HTTP and two kinds of agreements of FTP.
In the P2P downloading mode, all subscriber computers of participating in downloading also serve as the role that download is provided simultaneously, promptly also upload simultaneously.For a complete resource, can comprise a lot of data blocks.When the same resource of a lot of user's download, the data block of acquisition all is not quite similar, so each subscriber computer can offer other not this data computing machine downloads with own existing data.Under the enough situation of the network bandwidth, when the computer of participating in downloading more for a long time, the speed of each this resource of downloaded is just fast more.
P2SP has merged the advantage of P2S and two kinds of downloading modes of P2P, through this bridge of multimedia retrieval database originally isolated server and its mirror image resources and P2P resource consolidation together.Speed of download is faster like this, and downloaded resources is abundanter simultaneously, and it is stronger to download stability.
Yet no matter be any downloading mode, traditional downloading mode is because network environment intricate, in downloading process, often is difficult to keep the high-speed downloads that continues, and it is longer to expend time in.In addition, if a download URL link fails then again can't download to the file of wanting probably, can not guarantee the effectively permanent of download link.
And PC generally fixes, and cannot surf the Net whenever and wherever possible, and along with development of technology, mobile communication equipment terminals has had the function of browsing page, and more user is through mobile communication equipment terminals access websites whenever and wherever possible.But,, still have very big problem through the mobile communication equipment terminals file in download.Wherein maximum problem is that mobile communication equipment terminals is connected with network through the arrowband, so speed is slower during file in download.Simultaneously, under communication environment now, through the mobile communication network access websites, the flow that user's download produced is direct and the telephone expenses hook, if downloaded files is bigger, then needed expense and money are just many.
Summary of the invention
The high speed property that the technical problem that the present invention will solve is downloaded and the permanent validity of file to be downloaded are to improve the user experience of downloading.In order to address the above problem; The invention provides a kind of method and corresponding system thereof that downloads based on the off-line of cloud storage; Wherein server end is set up special-purpose off-line download system; When the user wants to download a file, as long as download request is submitted to the off-line download system, by the download work of off-line download system deadline.
The present invention provides a kind of off-line download system based on the cloud storage, comprises custom system, the distributed downloads system, and cloud storage system and CDN system, wherein, said custom system comprises user profile tabulation and downloading task information list.
Said each registered user's of user profile list records information; The registered user's of said record information comprises the identifier that the user is unique; User's private room store path in the said cloud storage system; User's private room in the said cloud storage system amounts to the size of capacity, the user's private room current residual amount of capacity in the said cloud storage system.
The information of said each downloading task of downloading task information list record; The information of the downloading task of said record comprises unique identifier of the user who submits said downloading task to; The link of the download address of said downloading task, the download state of said downloading task.
Wherein said download state does not comprise to be downloaded, and downloads, and downloads and accomplishes and failed download.
Said distributed downloads system comprises task scheduling server and Download Server cluster.Wherein,
The load condition of the said Download Server cluster of said task scheduling server real time record, every Download Server in the said Download Server cluster is carried out actual downloading task.
Said cloud storage system carries out data communication through cloud storage system interface and other system.Wherein, said cloud storage system adopts the GFS framework, and said each registered user has its corresponding privately owned memory space in said cloud storage system.
Said CDN content delivering system comprises CDN dispatch server and CDN fringe node; Wherein, Said CND fringe node carries out data communication through said cloud storage system interface and said cloud storage system, and said CDN dispatch server and each user carry out data communication.
In addition, the present invention also provides a kind of off-line method for down loading based on the cloud storage, it is characterized in that, comprising:
Custom system receives the user and is submitted to the download request in the said custom system;
Custom system converts the said download request that receives into downloading task, and said downloading task is stored in the downloading task information list;
The task scheduling server is obtained new downloading task from said custom system, and the new downloading task that will obtain is distributed to Download Server;
The task scheduling server is updated to " downloading " with the task status that will distribute to the downloading task of said Download Server in the said downloading task information list in the said custom system;
Said Download Server is carried out actual download work;
After the download work of said Download Server completion appointment downloaded files is stored in the cloud storage system;
Send the information of accomplishing of downloading to said task scheduling server after the download work of said Download Server completion appointment;
Said task scheduling server is updated to " download and accomplish " with the task status of the downloading task that will accomplish in the said downloading task information list in the said custom system after the information of receive to download accomplishing;
The user obtains the request downloaded files through custom system.
Preferably; Said task scheduling server is according to the said downloading task that obtains; Obtain the size of file to be downloaded; Said task scheduling server from being divided into N burst in logic, is selected the minimum relatively Download Server of N platform present load task with file to be downloaded from said Download Server cluster;
Preferably, said N platform Download Server receives N downloading task of the correspondence of said task scheduling server-assignment respectively;
Preferably, said task scheduling server is updated to " download and accomplish " with the task status of the downloading task that will accomplish in the said downloading task information list in the said custom system after receiving said N sheet downloading task and all accomplishing;
Preferably; ID and CDN scheduling address that said custom system will be downloaded the file of completion send to the user; Said user is according to the said CDN dispatch server of said CDN scheduling accessed, and said CDN dispatch server sends to said user with qualified CDN fringe node address;
Preferably, said user sends to the said CDN fringe node that receives with the said ID that has downloaded the file of completion and obtains the request downloaded files.
Preferably, said CDN fringe node is downloaded the described request downloaded files through the interface of said cloud storage system from cloud storage system, and after downloading task is accomplished with CDN fringe node described in the said file in download buffer memory in.
Compared with prior art; The invention has the advantages that: method that a kind of off-line provided by the invention is downloaded and corresponding system alternate user thereof are accomplished actual download work; Downloaded files is can permanent storage local at the off-line download system; Even if the origin url of this document lost efficacy in the future, the user still can get access to this document through download request being submitted to the off-line download system.This has just guaranteed the permanent validity of downloading, and the workflow of system side is fully transparent for the user.In addition; After method that a kind of off-line provided by the invention is downloaded and corresponding system thereof accomplish actual download work; Notify the user, the high-speed channel between user's use and the off-line download system downloads files into the PC of oneself, and this has just guaranteed the high speed property of transfer of data.
Description of drawings
In order to make the present invention be convenient to understand, combine accompanying drawing to describe specific embodiment of the present invention now.
Fig. 1 is a kind of off-line download system overall structure figure based on the cloud storage among the present invention.
Embodiment
Below in conjunction with accompanying drawing with preferred embodiment the present invention is described in further detail.
The present invention sets up special-purpose off-line download system in server one side, when the user wants to download a file, as long as download request is submitted to the off-line download system, accomplishes actual download work by the off-line download system.After the off-line download system is accomplished download work, the file storage of downloading is local at the off-line download system, and notify user's download to accomplish, can arrive the off-line download system and obtain.High-speed transfer passage between user's use and the off-line download system downloads files in the local computer of oneself.
Especially, after downloading process of off-line download system completion that file in download of having stored and download URL foundation is related, and with this incidence relation buffer memory.Like this; When other users submit the download request to this URL once more to; The off-line download system need can find downloaded files to be stored in system this locality, informs directly that then user's download accomplishes, and the user uses the high-speed transfer passage to download files in the local computer of oneself.
In the custom system of the off-line download system based on cloud storage provided by the invention, safeguarding two tables: user profile tabulation and downloading task information list.Wherein,
The user profile tabulation is for each registered user, in cloud storage system, is it and distributes a certain size privately owned memory space.Writing down all registered users' information in the user profile tabulation, each registered user's information is following four-tuple:
<UserID、StorePath、TotalCapacity、RemainCapacity>
UserID: user's unique identifier;
StorePath: the user's private room store path in the cloud storage system;
TotalCapacity: the user's private room in the cloud storage system amounts to amount of capacity;
RemainCapacity: the user's private room current residual amount of capacity in the cloud storage system.
The downloading task information list is after custom system is accepted the download request of user's submission, request is converted into a downloading task is stored in the mission bit stream tabulation.The information of each downloading task is following tlv triple:
<UserID、URL、State>
UserID: user's unique identification of submitting this downloading task to;
URL: download address link;
State: the state of downloading task.Downloading task is divided into one of four states in whole downloading process: " not downloading ", " in the download ", " download and accomplish ", " failed download ".
The distributed downloads system of the off-line download system based on cloud storage provided by the invention is made up of separate unit task scheduling server and Download Server cluster.Every Download Server in the Download Server cluster is carried out actual download work, and every Download Server all has the upper limit of the downloading task of bearing.Task scheduling server real time record the load state of every Download Server.
The task scheduling server is regularly obtained the task of a state for " not downloading " from custom system downloading task information table; According to the download address link URL; Get access to the size of file to be downloaded; From in logic this document being divided into N blocks of files,, select the load N platform Download Server of light (the current downloading task of bearing is minimum relatively) relatively according to the load state of current each Download Server that writes down; Give this N platform Download Server with the task assignment of obtaining, every Download Server is responsible for the actual download of a blocks of files (burst).After task assignment finished, dispatch server was updated to " in the download " with the state of this downloading task in custom system mission bit stream table.Download Server feeds back to dispatch server with the result after accomplishing the actual download of burst.All during success, dispatch server just is updated to the downloading task state in the mission bit stream table " download and accomplish ", otherwise downloading task is labeled as " failed download " in the download of having only all bursts.
Every Download Server in the Download Server cluster is responsible for actual download work.For a downloading task, a Download Server is responsible for the download of a logic burst of file to be downloaded; According to the Real-Time Scheduling of task scheduling server, the separate unit Download Server can be born a plurality of downloading task, but the task sum can not surpass the predefined upper limit.After the download of the logic burst of each task of Download Server completion; The download of this burst of notice task scheduling server is accomplished; And the interface that uses cloud storage system to provide, write in the cloud storage system in the corresponding privately owned memory space of user downloading the data of accomplishing.
The cloud storage system of the off-line download system based on cloud storage provided by the invention is the warehouse of file storage, and the off-line download system is downloaded the file that gets off, all is stored in the cloud storage system.Cloud storage system uses the GFS framework, and there are good back mechanism, disaster tolerance mechanism in inside, and these are all transparent to external world, and the present invention does not relate to the internal mechanism of cloud storage system.The I/O interface that ambient systems uses cloud storage system to provide carries out the data reading and writing with it mutual.
The CDN content delivering system of the off-line download system based on cloud storage provided by the invention is distributed to the nearest CDN fringe node of distance users with the file of downloading, and the user is visited nearby; Because it is distributed storage cluster that said cloud storage system is seen internally, but its distributed characteristics are in order to satisfy backup and disaster tolerance; Do not have the character of " distribution "; Therefore see that from the outside cloud storage system remains centralised storage, need the support of CDN system.
The flow process that a preferred off-line of the present invention is downloaded is following:
The user is submitted to the custom system in the off-line download system with download request, supposes that download address is linked as URL.Custom system converts download request into a downloading task, is stored in the downloading task information table.
Task scheduling server in the off-line download system is obtained new downloading task from custom system; Obtain the size of file to be downloaded through download link URL; And,, from the Download Server cluster, select the minimum relatively Download Server of N platform present load according to the scheduling mechanism of self from being divided into N burst in logic; Respectively the downloading task of N burst is assigned to this N platform Download Server, and the task status in the custom system downloading task information table is updated to " in the download ".
N platform Download Server is carried out actual download work, after every Download Server is accomplished the download of specifying burst, through the cloud storage system interface, fragment data is write in the cloud storage system, and downloads the result to the task scheduling server feedback.
After all burst was downloaded successfully, the user needed downloaded files also promptly to be stored in the cloud storage system.Task status in the task scheduling server update downloading task information table is " download and accomplish ".
The custom system ID and the CDN scheduling address of file in download offers user 1; User 1 is according to scheduling accessed CDN dispatch server; The request distance is own recently, the optimal CDN fringe node of load state, and the CDN dispatch server is informed the user with the address of a qualified CDN fringe node.
The user will be the ID of file in download be sent to the CDN fringe node of appointment, ask for this document.If the CDN fringe node does not still have the buffer memory of this document, then, utilize the interface of cloud storage system from cloud storage system, to download this document through high-speed channel, be buffered in own this locality after having downloaded earlier, push to the user again.This moment, whole off-line downloading process was accomplished, and the user has obtained the downloaded files wanted.
More than combine specific embodiment of the present invention to describe in detail, but be not to be limitation of the present invention.Every foundation technical spirit of the present invention all still belongs to the scope of technical scheme of the present invention to any simple modification that above embodiment did.
Claims (10)
1. off-line download system based on cloud storage is characterized in that said system comprises:
Custom system, the distributed downloads system, cloud storage system and CDN content delivering system, wherein,
Said custom system comprises user profile tabulation and downloading task information list, said each registered user's of user profile list records information, the information of said each downloading task of downloading task information list record;
Said distributed downloads system comprises task scheduling server and Download Server cluster; The load condition of the said Download Server cluster of said task scheduling server real time record, every Download Server in the said Download Server cluster is carried out actual downloading task;
Said cloud storage system carries out data communication through cloud storage system interface and other system, and said each registered user has its corresponding privately owned memory space in said cloud storage system;
Said CDN content delivering system comprises CDN dispatch server and CDN fringe node, and said CND fringe node carries out data communication through said cloud storage system interface and said cloud storage system, and said CDN dispatch server and each user carry out data communication.
2. the off-line download system based on the cloud storage as claimed in claim 1 is characterized in that the registered user's of said record information comprises the identifier that the user is unique.
3. the off-line download system based on the cloud storage as claimed in claim 1 is characterized in that the registered user's of said record information also comprises the user's private room store path in the said cloud storage system.
4. the off-line download system based on the cloud storage as claimed in claim 1 is characterized in that, the registered user's of said record information comprises that also the user's private room in the said cloud storage system amounts to the size of capacity.
5. the off-line download system based on the cloud storage as claimed in claim 1 is characterized in that the registered user's of said record information also comprises the user's private room current residual amount of capacity in the said cloud storage system.
6. the off-line download system based on the cloud storage as claimed in claim 1 is characterized in that the information of the downloading task of said record comprises unique identifier of the user who submits said downloading task to.
7. the off-line download system based on the cloud storage as claimed in claim 1 is characterized in that the information of the downloading task of said record also comprises the link of the download address of said downloading task.
8. the off-line download system based on the cloud storage as claimed in claim 1 is characterized in that the information of the downloading task of said record also comprises the download state of said downloading task.
9. the off-line download system based on the cloud storage as claimed in claim 8 is characterized in that the download state of said downloading task comprises the state of not downloading.
10. the off-line download system based on the cloud storage as claimed in claim 8 is characterized in that the download state of said downloading task also comprises the state of downloading.
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