CN102255866A - Method and device for downloading data - Google Patents
Method and device for downloading data Download PDFInfo
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- CN102255866A CN102255866A CN2010101736052A CN201010173605A CN102255866A CN 102255866 A CN102255866 A CN 102255866A CN 2010101736052 A CN2010101736052 A CN 2010101736052A CN 201010173605 A CN201010173605 A CN 201010173605A CN 102255866 A CN102255866 A CN 102255866A
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Abstract
The invention discloses a method for downloading data, which is applied in a network file system including a node server and a client. Pre-read data is buffered in the node server and is pre-read from a disk by the node server according to an analysis result for downloaded logs of a user. The method also comprises the steps: the node server receives a data downloading request from the client; and the node server transmits the pre-read data to the client when the pre-read data meets a reading request which corresponds to the data downloading request. According to the invention, the speed of downloading the data can be improved. The invention also discloses a device applying the method.
Description
Technical field
The present invention relates to Internet technical field, relate in particular to a kind of data download method and device.
Background technology
Along with the expansion of development of internet technology and web influence, the generation of hardware error and network error is more prevalent, and the storage of mass data and calculating become the challenge to the network system performance.For network system, one be applicable to large-scale distributed data, to handle NFS related application, extendible, safe and reliable (Network File System, NFS) very important.This distributed file system is based on common hardware device, realize fault-tolerant design, and provide high aggregation processing ability for a large amount of clients, can significantly improve the fail safe of system, concurrent computing capability and handling capacity, the service quality that improves each application system is played most important effect.
As shown in Figure 1, the NFS system is made up of one NFS Master (NFS primary control program) and a Scheduler Master (asynchronous scanning primary control program) and some Node Server (node server) and Scheduler Client (asynchronous scanning client).In addition, the NFS Client in the network (NFS client) also can visit the NFS system.In the NFS system, each file all splits into the Node (node) of fixed size.At each node, the time that NFS Master creates according to node produces a unique and Node handle (node identification) of 64 that can not change later of the overall situation.Node Server preserves above-mentioned node with the Linux file system on local disk, and according between Node handle and byte regions, by the data of Linux file system read-write node.For the consideration of reliability, each node all can be preserved backup on different Node Server.Under the default situation, can preserve 2 backups, the user also can specify the different ranks of duplicating to different files.
NFS Master is in charge of the metadata of all files, comprises that the name space, access control information, file are to the position of the mapping relations of Node, current Node and the allocation manager of Node or the like information.Carry out communication by regular heartbeat message between NFS Master and the Node Server, this heartbeat message can transmit the state of information and Node Server.Each Node Server can be a common Linux computer, and the server processes of a user class of operation are stored data with common file on the computer.When Client uploads with data download, direct and Node Server communication.Scheduler Master is responsible for the Node mirror image management between asynchronous scanning, load balancing, machine change, the Node Server and the recovery of redundant rubbish node etc.Can move Scheduler Client respectively on each Node Server, be responsible for data verification, back up, report machine state and load etc., Scheduler Master scheduling Scheduler Client finishes above-mentioned task.
API (the ApplicationProgramming Interface of include file system in the code of the NFS client of each application system, application programming interface), and carry out communication, the operation of representing application program to read and write data with NFS Master and Node Server.NFS client and NFS Master carry out the operation of metadata, but all communications relevant with data of NFS client are all direct and NodeServer carries out.
In the prior art, when the NFS client is passed through API or command-line tool data download, at first ask the Node nodal information at data downloaded place, the direct and Node Server communication according to the Node nodal information that obtains, and data download to NFS Master.
The inventor finds that there is following defective at least in prior art in realizing process of the present invention:
After Node Server received the download request of NFS client, directly reading corresponding data also returned to the NFS client with these data from disk, waits for the download request next time of NFS client then; When download request arrival next time, Node Server repeats last response mode, and reading corresponding data also returns to the NFS client with these data from disk, and response speed is slow.In addition, between twice download request, Node Server is in loitering phase always, causes the waste of CPU (Central ProcessingUnit, CPU), magnetic disc i/o (Input/Output, input/output port) and the network bandwidth.
Summary of the invention
The invention provides a kind of data download method and device, be used to improve the speed of data download.
The invention provides a kind of data download method, be applied to comprise in the NFS of node server and client, be cached with the data that read in advance in the described node server, the described data that read in advance are the data that described node server reads from disk in advance according to the analysis result to the user's download daily record, and described method is further comprising the steps of:
Described node server receives the data download request from described client;
When the reading requirement of the described data download request of the described data fit that reads in advance correspondence, described node server sends to described client with the described data that read in advance.
Preferably, described method also comprises:
Described node server judges whether described client asks data download for the first time after current TCP connects, when described client was asked the reading requirement of data download and the described data download request of the described data fit that reads in advance correspondence for the first time after current TCP connects, described node server sent to described client with the described data that read in advance.
Preferably, described method also comprises:
When described client is when asking data download and/or the described data that read in advance not to meet the reading requirement of described data download request correspondence for the first time, described node server reads the data of described data download request correspondence from described disk, and described data are sent to described client.
Preferably, described method also comprises:
Preferably, described file network system also comprises primary control program, and described method also comprises:
Described primary control program obtains the analysis result to the user's download daily record, and adjusts the backup factor of each file in the described file network system according to described analysis result.
The present invention also provides a kind of node server, is applied to comprise that described node server comprises in the NFS of node server and client:
Read module is used for according to the analysis result to the user's download daily record, pre-reading data from disk;
Cache module is used for the data that the described read module of buffer memory reads in advance;
Receiver module is used to receive the data download request from described client;
Sending module is used for when described cache module data in buffer meets the reading requirement of the data download request correspondence that described receiver module receives the described data that read in advance being sent to described client.
Preferably, described node server also comprises:
Judge module is used for the data download request that receives according to described receiver module, judges whether described client asks data download for the first time after current TCP connects, for described sending module use;
Described sending module, being used in described client is not when asking for the first time the reading requirement of the described data download request of the data fit correspondence that data download and described read module read in advance, the described data that read in advance to be sent to described client.
Preferably, described read module, also being used in described client is when asking data download and/or the described data that read in advance not to meet the reading requirement of described data download request correspondence for the first time, reads the data of described data download request correspondence from described disk;
Described sending module also is used for described data are sent to described client.
Preferably, described node server also comprises:
Generation module is used to generate the corresponding user's download daily record of data that sends to described client with described sending module.
Compared with prior art, the present invention has the following advantages: the present invention is by the trend of the data read behavior of analysis user, read these data in advance from disk, and when the data fit reading requirement that reads in advance, directly return the data that read in advance and give client, thereby shortened from the time of disk reading of data, accelerated the speed of data download, can provide better download service to the user quickly.
Description of drawings
In order to be illustrated more clearly in the present invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in the present invention or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a NFS system configuration schematic diagram of the prior art;
Fig. 2 is a kind of data download method flow chart among the present invention;
Fig. 3 is the data downloading system configuration diagram in the application scenarios of the present invention;
Fig. 4 is the data download method flow chart in the application scenarios of the present invention;
Fig. 5 is the structural representation of a kind of node server among the present invention.
Embodiment
In the NFS system, Node Server to response time of NFS client comprise the time that receives request msg, the time of analyzing agreement and request msg, from time of disk reading of data and send the time of response data to the NFS client, wherein, the time-dependent that receives request and send response data is in the speed of network I/O, and the time of agreement and request msg of analyzing also can't be optimized.
In the technical scheme provided by the invention, by optimizing the response time to the NFS client, to improve response speed from the time decreased NodeServer of disk reading of data.Particularly, responded the request of a NFS client at Node Server after, the trend of the data read behavior of analysis user is prejudged the size of the data that the NFS client may read next time, and reads these data in advance from disk.When receiving the request next time of client, if the data symbols that reads in advance should the corresponding reading requirement of request, Node Server directly returns the data that read in advance and gives client.
Below in conjunction with the accompanying drawing among the present invention, technical scheme of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
As shown in Figure 2, be a kind of data download method flow chart among the present invention, be applied to comprise in the NFS of node server and client, be cached with the data that read in advance in the node server, these data that read in advance data that to be node server read from disk in advance according to the analysis result to the user's download daily record, this method is further comprising the steps of:
Particularly, node server judges whether client asks data download for the first time after current TCP connects, when client is asked data download and during the reading requirement of the data fit data download request correspondence that reads in advance, the data that node server will read in advance send to client the first time after current TCP connects.When client is for the first time to ask data download and/or the data that read in advance when not meeting the reading requirement of data download request correspondence, node server reads the data of this data download request correspondence from disk, and these data are sent to client.
After node server sent the data to client, node server can generate the user's download daily record corresponding with the data that send to client.Above-mentioned file network system can also comprise primary control program, and this primary control program obtains the analysis result to the user's download daily record, and adjusts the backup factor of each file in file network system according to this analysis result.
The present invention is by the trend of the data read behavior of analysis user, read these data in advance from disk, and when the data fit reading requirement that reads in advance, directly return the data that read in advance and give client, thereby shortened from the time of disk reading of data, accelerate the speed of data download, can provide better download service to the user quickly.
Data download method among the present invention can be applied to comprise: NFS client, NFS Master, Node Server and Log analysis module in as shown in Figure 3 the system architecture.
Wherein, the NFS client according to fixing Node size (for example, 64M), convert application need downloaded files name and side-play amount to file inner Node index, and send the data download request of include file name and the inner Node index of file to NFS Master.NFS Master returns relevant Node handle and corresponding position to the NFS client, and the above-mentioned information of NFS client-cache is with filename and the inner Node index of the file crucial index word as the information of above-mentioned buffer memory.
The NFS client sends the data download request to the Node of correspondence Server, this Node Server normally in the system from the nearest Node Server of NFS client, this data download request is given Nodehandle and in Node, need to read between byte regions, after Node Server received the data download request, return data was given the NFS client.
The Log analysis module is used for analysis user to be uploaded, download, adds and user behavior information such as deletion and revised file, obtain user's the trend that reads, this reads trend can comprise the title that next time reads file, length and this data position hereof of reading of data next time.
Particularly, the Log analysis module can be according to the length of the each data downloaded of user that comprises in the user's download daily record, and predictive user is the length of data download next time, and with the length of these data trend that reads as the user.For example, in the user's download daily record, when the length of user's each data downloaded in before n time downloads is the L byte, then the Log analysis module can predictive user next time the length of data download also be the L byte.
The Log analysis module also can be according to the title of the each downloaded files of user that comprises in the user's download daily record, and predictive user is the title of file in download next time, and the name of this file in download is referred to as user's the trend that reads.For example, in the user's download daily record, when the title of user's each downloaded files in before n time downloads is a file, and also there are the data of a file that the user do not read in Node Server, then the Log analysis module can predictive user next time the title of file in download also be a file.
Further, the Log analysis module can also be according to the each data downloaded of the user who comprises in user's download daily record position hereof, predictive user is data downloaded position hereof next time, and with the read trend of these data position hereof as the user.For example, in the user's download daily record, when the user reads data in a file successively in before n time downloads, and last data downloaded is arranged in m+1 byte of a file to m+L byte, then the Log analysis module can predictive user next time data downloaded be arranged in m+L+1 byte of a file to m+2L byte.
The Log analysis module regularly will be pushed to NFS Master and each Node Server to the analysis result of user's download daily record, and this analysis result can be applied to the user and improve in the various aspects application of speed of download, reliability and fail safe.When Node Server provides download service for the user, can read a part of data in advance in advance, accelerate response speed according to user's the behavior of reading trend; NFS Master can determine the backup factor whether needs improve file according to the visiting frequency of file, increases the backup factor of file for the more frequent file of visit temporarily.Detailed log analysis is for the discovery of problem and debugging solves and performance evaluation has immeasurable effect.By log analysis, can the whole information interaction history of reconstruct, can diagnostic system problem and optimization system performance.
Below in conjunction with above-mentioned application scenarios the data download method among the present invention is carried out detailed, concrete description.
As shown in Figure 4, the data download method flow chart in the application scenarios of the present invention specifically may further comprise the steps:
Particularly, the NFS client can (for example, 64M) and preset conversion rule, convert filename and side-play amount to file inner Node index according to fixing Node size when file in download.Because the NFS system is when storage file, also file is carried out piecemeal according to above-mentioned transformation rule, and the file behind the piecemeal is stored into respectively on the disk of each Node Server, therefore, NFS Master is appreciated that the NFS client is converted to the inner Node index of file, can also obtain the Node nodal information of the inner Node index of file correspondence.
Wherein, can comprise the inner Node index of filename and file in the data download request.
Particularly, NFS Master is according to filename that carries in the data download request and the inner Nodeindex of file, obtain the Node nodal information of the Node Server of the data of storing this document name and the inner Node index of file correspondence, and this Node nodal information is sent to the NFS client.
Wherein, the control information in the data download request can comprise Node nodal information and data download scope.
Whether particularly, after TCP connected, Node Server can write down the number of times of NFS client-requested data download, and judged the NFS client after current TCP connects according to the number of times of this record, first requests data reading.
Wherein, the data that read in advance are that Node Server is according to the analysis result to the user's download daily record, the data that read from disk before receiving the data download request.Reading requirement can be downloaded scope for data.
Particularly, if the data that read in advance meet the reading requirement of data download request fully, NodeServer returns whole data that read in advance to the NFS client; If the data division that reads in advance meets the reading requirement of data download request, then will meet the data division that the part of reading requirement reads in advance and return to the NFS client, from disk, read remaining data and return to the NFS client.
Need to prove, execute this step after, continue execution in step 410.
Wherein, the user's download daily record that Node Server generates can offer the Log analysis module, and the Log analysis module can read trend according to user's download log analysis user, and analysis result is pushed to Node Server.Node Server reads the data of some in advance according to the analysis result that the Log analysis module pushes from disk.Wherein, the analysis result that the user is read trend can comprise the title that next time reads file, length and this data position hereof of reading of data next time.
Need to prove that as another embodiment of the invention, Node Server connects at current TCP before the data download request that receives for the first time from the NFS client, can also be data cached in advance according to the focus fileinfo in the system.After the data download request that receives from the NFS client, Node Server can judge the data that whether comprise this download request correspondence in the buffer memory, if having, can directly data in buffer be sent to the NFS client; Otherwise, from disk, read the data corresponding and send to the NFS client with the data download request.
The present invention is by the trend of the data read behavior of analysis user, read these data in advance from disk, and when the data fit reading requirement that reads in advance, directly return the data that read in advance and give client, thereby shortened from the time of disk reading of data, accelerate the speed of data download, can provide better download service to the user quickly.
The present invention provides data download method and application scenarios in the above-described embodiment, and correspondingly, the present invention also provides the device of using above-mentioned data download method.
As shown in Figure 5, be the structural representation of a kind of node server among the present invention, be applied to comprise that this node server comprises in the NFS of node server and client:
Read module 510 is used for according to the analysis result to the user's download daily record, pre-reading data from disk.
Sending module 540 is used for when cache module 520 data in buffer meet the reading requirement of the data download request correspondence that receiver module 530 receives the described data that read in advance being sent to described client.
Above-mentioned node server can further include:
Correspondingly, sending module 540, being used in described client is not when asking for the first time the reading requirement of the described data download request of the data fit correspondence that data download and described read module read in advance, the described data that read in advance to be sent to described client.
Above-mentioned read module 510, also being used in described client is when asking data download and/or the described data that read in advance not to meet the reading requirement of described data download request correspondence for the first time, reads the data of described data download request correspondence from described disk;
Correspondingly, above-mentioned sending module 540 also is used for described data are sent to described client.
Above-mentioned node server can further include:
The present invention is by the trend of the data read behavior of analysis user, read these data in advance from disk, and when the data fit reading requirement that reads in advance, directly return the data that read in advance and give client, thereby shortened from the time of disk reading of data, accelerate the speed of data download, can provide better download service to the user quickly.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a station terminal equipment (can be mobile phone, personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be looked protection scope of the present invention.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be integrated in one, and also can separate deployment; A module can be merged into, also a plurality of submodules can be further split into.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (9)
1. data download method, be applied to comprise in the NFS of node server and client, it is characterized in that, be cached with the data that read in advance in the described node server, the described data that read in advance are the data that described node server reads from disk in advance according to the analysis result to the user's download daily record, and described method is further comprising the steps of:
Described node server receives the data download request from described client;
When the reading requirement of the described data download request of the described data fit that reads in advance correspondence, described node server sends to described client with the described data that read in advance.
2. the method for claim 1 is characterized in that, also comprises:
Described node server judges whether described client asks data download for the first time after current TCP connects, when described client was asked the reading requirement of data download and the described data download request of the described data fit that reads in advance correspondence for the first time after current TCP connects, described node server sent to described client with the described data that read in advance.
3. the method for claim 1 is characterized in that, also comprises:
When described client is when asking data download and/or the described data that read in advance not to meet the reading requirement of described data download request correspondence for the first time, described node server reads the data of described data download request correspondence from described disk, and described data are sent to described client.
4. as each described method in the claim 1 to 3, it is characterized in that, also comprise:
Described node server generates the user's download daily record corresponding with the data that send to described client.
5. as each described method in the claim 1 to 3, it is characterized in that described file network system also comprises primary control program, described method also comprises:
Described primary control program obtains the analysis result to the user's download daily record, and adjusts the backup factor of each file in the described file network system according to described analysis result.
6. a node server is applied to comprise in the NFS of node server and client, and it is characterized in that, described node server comprises:
Read module is used for according to the analysis result to the user's download daily record, pre-reading data from disk;
Cache module is used for the data that the described read module of buffer memory reads in advance;
Receiver module is used to receive the data download request from described client;
Sending module is used for when described cache module data in buffer meets the reading requirement of the data download request correspondence that described receiver module receives the described data that read in advance being sent to described client.
7. node server as claimed in claim 6 is characterized in that, also comprises:
Judge module is used for the data download request that receives according to described receiver module, judges whether described client asks data download for the first time after current TCP connects, for described sending module use;
Described sending module, being used in described client is not when asking for the first time the reading requirement of the described data download request of the data fit correspondence that data download and described read module read in advance, the described data that read in advance to be sent to described client.
8. node server as claimed in claim 6 is characterized in that,
Described read module, also being used in described client is when asking data download and/or the described data that read in advance not to meet the reading requirement of described data download request correspondence for the first time, reads the data of described data download request correspondence from described disk;
Described sending module also is used for described data are sent to described client.
9. as each described node server in the claim 6 to 8, it is characterized in that, also comprise:
Generation module is used to generate the corresponding user's download daily record of data that sends to described client with described sending module.
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