CN101345690B - Contents grading memory of telecommunication level P2P network and transmission method - Google Patents
Contents grading memory of telecommunication level P2P network and transmission method Download PDFInfo
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Abstract
The invention relates to a content staging memory storage and transmission method of a communication level P2P network, wherein all sharing content is stored on three kinds of nodes with P2P alternation capability, namely: a content storage central node, a content storage fringe node and a content storage terminal node. According to the invention, the content is downloaded in priority order of the content storage terminal node, the content storage fringe node and the content storage central node. The scheme of the invention satisfies the requirement of the communication level network on stability, high efficiency, high quality and saved cost, thereby solving the problems of lower efficiency of prior distributivity storing frame, deficient content, 'uneven cold and hot' of content storage and distribution.
Description
Technical field
The present invention relates to a kind of content classification storage and transfer approach of telecommunication level P 2 P network.
Background technology
At present, the most widely used field of P2P is exactly to be the field of resource sharing of representative with the file in download, various file-sharing softwares emerge in an endless stream, for example BitTorrent, eMule, KazaA, domestic KuGoo, PP click-through etc., and wherein the use with BitTorrent and eMule is the most extensive.
Distributed storage mode has all been adopted in above various application, and promptly all shared files all disperse to leave on the terminal node, and the content that wherein has is complete, and the content that has then lacks some segment.Have " selfishness " behavior because the P2P content is shared the field, promptly a lot of users no longer provide shared to other people after obtaining complete file, cause a lot of contents to have the situation of segment disappearance on network, thereby can't form complete file.In addition, the content of " focus " is easy to find the seed of download in one period, and the content of " unexpected winner " often can not find the seed that can download.Even more serious is that when these contents that are distributed in the different location transmitted on the internet, its flow and the flow direction were unordered, have and be difficult to the characteristic predicting and control, for whole network, can cause the waste of a large amount of network bandwidth resources, its whole efficiency is not high.Above-mentioned these problems all come from these P2P application and do not develop for the carrier class service operation, so the content stores framework of its bottom can not fully satisfy the requirement of carrier class service operation.Be fit to carrier-class P2P content sharing application if develop, just must find the technological means that can address the above problem.
Summary of the invention
The objective of the invention is to propose a kind of content classification storage architecture of telecommunication level P 2 P network and the content transfer method of burst equity transmission, it is applicable to the exploitation based on carrier-class P2P content sharing application, can satisfy the requirement of carrier class network, thereby solve the problem of existing distributed storage architecture inefficiency and content disappearance, content stores and distribution " uneven in temperature " stability, high efficiency, high-quality and the cost that practices every conceivable frugality.
For achieving the above object, the present invention has adopted a kind of storage architecture of classification, wherein all shared contents all leave on three grades of shared nodes that possess autonomous P2P ability, comprising: content stores Centroid (CSCN), content stores fringe node (CSEN) and content stores terminal node (CSTN).Wherein the calculating of content stores Centroid and storage capacity are the strongest, and it is the highest to connect bandwidth, general long-time staying incessantly on the network, and the initial data by examination, content legality all leaves on this category node.The content stores fringe node is distributed in the edge of network access layer, compare with the content stores Centroid, its calculate and storage capacity a little less than, to be connected bandwidth lower, these nodes generally also are to stay on the network for a long time.The 3rd category node is the content stores terminal node, the calculating of this category node and storage capacity is the most weak, access bandwidth is minimum, and it is indefinite to rest on the online time.
Principle according to the content centralized stores, whole initial data by examination, content legality all leave on the content center node, this node is as the storage and the distribution node of concentrated and reserve, can guarantee the legitimacy and the integrality of content in the whole system, thereby ensure those less delivery quality that " unexpected winner " content of user's download is arranged.
The content stores fringe node can increase the service source of focus content as the important node of stablizing resource is provided, and improves content service quality and response speed, for the user provides service nearby, improves the Terminal Service quality, reduces the flow that passes through of backbone network simultaneously.As required, the content stores center regularly or aperiodically is distributed to the focus content on the content stores fringe node.
When transmitting content, the content stores terminal node at first requires to download content to other guide storage terminal node, if other guide storage terminal node does not have corresponding content, then the content stores fringe node under it is asked for this content; If this content stores fringe node has corresponding content, then the content stores terminal node to the request of sending transmits this content, if do not have, then asks for this content to other guide storage fringe node; If other guide storage fringe node has corresponding content, then this content is sent to the content fringe node of the request of sending, and and then send to content stores terminal node that need to download this content, if other guide storage fringe node does not have corresponding content yet, then ask for this content to content storage center node, send this content the content fringe node of the request of sending to by the content stores Centroid, and and then send the content stores terminal node that needs to download this content to.
In the present invention, by the storage and the transmission of above-mentioned three grades of nodes, realized that equity between the brother of node transmits and lower-level nodes to the content requests of higher-level node.With traditional CDN forms sharp contrast is that the present invention does not adopt the C/S hierarchical structure and the distribution policy of existing CDN system, but has introduced the principle of distributed P 2 P transmission, has realized the content distribution and exchange of content source center and peripheral node.
Different with the pattern of existing C DN source contents center centralized management exchangeable object, the content stores fringe node can be from the tabulation of content information autonomous select target node (comprising content stores Centroid, other guide storage fringe node and content stores terminal), set up P2P with it and connect and realize obtaining and transmitting of content.
The content stores fringe node has the parallel download capabilities of P2P, and it not only can download content from the content stores Centroid, and can download related content from other content stores fringe node.
Have only when other content stores terminal does not have the required content segments of user, when running into unexpected winner segment or some contents and have deletion fragment, can not be organized into complete content, just ask for to the content stores fringe node, under the situation that the content stores fringe node does not have yet, finally ask for to content storage center node.
Different with existing C DN content downloading mode is, adopted fragmentation schema in the present invention, it is the same content fragment technology of all having introduced of content stores fringe node with other guide storage terminal node, can adopt the part downloading mode, download the different parts of same content respectively from a plurality of peer node, and obtain complete content by the content recombination form.Under unwanted situation, the content stores fringe node does not need to download the full content burst yet recombinates, thereby has saved memory space.
Adopt technical scheme of the present invention, compare with the central server of in the past C/S model, user terminal is much smaller to the pressure of content storage center node and content stores fringe node, therefore the requirement to equipment performance has reduced a lot, system does not need dilatation continually, is not easy to form bottleneck in network center and network edge yet.
Owing to introduced the P2P distributed transmission among the present invention, realized distributing and exchange of content source center and peripheral node from main contents, have more flexibility and intelligent.
In addition, the present invention helps to eliminate the problem of " uneven in temperature ".Relatively the content of " focus " can be distributed on content stores fringe node and the content stores terminal node, thereby does not need accessed content storage center node continually; And the content that compares " unexpected winner " also need not to occupy the memory space of the more weak terminal node of performance.Because visit capacity is little, can be to the visit of " unexpected winner " content to content storage center node formation pressure.
Description of drawings
Can understand classification storage architecture and content load mode better below with reference to accompanying drawing and to the specific descriptions of embodiment according to telecommunication level P 2 P network of the present invention.As shown in the figure:
Fig. 1 shows according to content classification storage architecture of the present invention.
Fig. 2 shows the whole pattern that pushes (push) of content distribution.
Fig. 3 shows the process of finding the focus content.
Fig. 4 shows the propelling movement of focus contents list.
Fig. 5 shows the P2P establishment of connection.
Fig. 6 shows the transmission of content fragment.
Fig. 7 shows the report of resource.
Embodiment
P2P content classification storage architecture of the present invention as shown in Figure 1.In this improved content stores framework, comprised that three classes possess the node of P2P interaction capabilities, i.e. content stores Centroid, content stores fringe node and content stores terminal node.Wherein, all leave on the content center memory node by whole initial data examination, content legality.According to the needs of distribution, the content on the content stores Centroid is distributed on the content stores fringe node aperiodically.The 3rd category node in the dotted ellipse is the content stores terminal node, and the performance and the storage capacity of this category node are the most weak, and access bandwidth is not high yet, and it is irregular, duration is stayed on the network erratically.
Generally speaking, the content stores terminal node only carries out P2P with other content stores terminal node, content stores fringe node and communicates by letter.The priority that its content is downloaded is successively: other guide storage terminal node, content stores fringe node, content stores Centroid.
According to flow localized principle, P2P content exchange between the content stores terminal node is generally carried out between adjacent node, as the network in same metropolitan area network or same area etc., have only when the content stores terminal of this area not (such as the deletion fragment of some unexpected winner contents or some contents) the required content segments of this user the time, can not be organized into a complete content, just need send request, notify the content stores fringe node of this area simultaneously to other regional content stores terminal nodes.Do not have when the content stores fringe node under the situation of required content yet, just ask for to content storage center node.
Fig. 2 shows the whole pattern that pushes of content distribution.Wherein the content stores Centroid can regularly or aperiodically be that unit pushes the integral body of content file to fringe node with the file according to judgement artificial setting or the focus content.What the content stores fringe node was received is complete content file.
Fig. 3,4,5,6 shows the intelligent distribution procedure of content.Generally speaking, the transmission of P2P content is initiated by the content stores terminal, and these content stores terminals are also as the P2P node.
As shown in Figure 3, the content stores terminal is generally obtained the various information of content by information distribution center, sets up P2P then and connect between each terminal node, and carry out the transmission of content.In the starting stage, owing to download node seldom, content also is in the state of " unexpected winner ", and this moment, the content stores terminal of this area did not generally all have the required content segments of user, can only send request to other regional content stores terminals.As shown in the figure, content stores fringe node CSEN_A subordinate's content stores terminal node CSTN sends the P2P connection request to another content stores fringe node CSEN_B subordinate's CSTN, and receives the content fragment of being stored from CSEN_B subordinate's content stores terminal node.
When CSEN_A downloads certain content when more and more, content stores terminal that information distribution center will perceive in certain area becomes " heat " gradually to obtaining of this content.Information distribution center will regularly be pushed to the content stores Centroid to the tabulation of these focus contents, by the content stores Centroid this tabulation will be handed down to each regional content stores fringe node again, as shown in Figure 4.
When the content stores fringe node obtains the tabulation of above-mentioned focus content, set up P2P with the content stores Centroid with the content stores fringe node respectively according to the content in the tabulation and be connected.As shown in Figure 5, CSEN_A learns that by the focus contents list CSEN_B and CSEN_C have certain content that this area becomes " heat ", therefore sets up P2P with CSEN_B, CSEN_C respectively and is connected.Simultaneously, the needs that these nodes also can obtain according to the focus content are set up P2P with content stores Centroid CSCN and are connected.
P2P connect to set up finish after, the transmission of content fragment is carried out in the tabulation of the content stores fringe node exchange content fragment that both sides had then, simultaneously also can be as required initiatively to some content fragment of content storage center node request.As shown in Figure 6, CSEN_A can obtain most of burst of certain focus content by CSEN_B and CSEN_C, but still lacks some burst, and at this moment CSEN_A just can apply for the fragment of these disappearances to content storage center node CSCN.
Although content stores fringe node and content stores terminal node have the branch of performance power, they all can be monitored.As shown in Figure 7, no matter be which kind of node, all need regularly to the tabulation of the resource management system report content fragment that they had.In order to prevent that resource management system from becoming bottleneck, the resource management system here also can be taked the mechanism of classification.
Therefore, when certain content after this area becomes focus gradually, local CSTN can learn the situation of change of distribution of content from resource management system, gradually reduce from the P2P node of far-end and obtain content fragment, then to the CSEN of this locality request content burst, the final content fragment of realizing progressively is distributed on local other the content stores terminal, realizes the localization of flow and the localization of focus content stores.
Claims (9)
1. the content classification storage and the transfer approach of a telecommunication level P 2 P network, wherein all shared contents all leave on three grades of nodes with P2P interaction capabilities, that is: content stores Centroid, content stores fringe node and content stores terminal node, wherein the calculating of content stores Centroid is the strongest with storage capacity, to be connected bandwidth the highest, stays on the network incessantly for a long time; The content stores fringe node is distributed in the edge of network access layer, compare with the content stores Centroid calculate and storage capacity a little less than, to be connected bandwidth lower, also is to stay on the network for a long time; The calculating of content stores terminal node is the most weak with storage capacity, it is minimum to be connected bandwidth, and the time of staying on the network is indefinite,
Wherein the whole initial data by examination, content legality all leave on the content stores Centroid, and the content stores Centroid regularly or aperiodically is distributed to " focus " content on the content stores fringe node,
When transmitting content, the content stores terminal node at first requires to download content to other guide storage terminal node, if other guide storage terminal node does not have corresponding content, then the content stores fringe node under it is asked for this content; If this content stores fringe node has corresponding content, then the content stores terminal node to the request of sending transmits this content, if do not have, then asks for this content to other guide storage fringe node; If other guide storage fringe node has corresponding content, then this content is sent to the content fringe node of the request of sending, and and then send to content stores terminal node that need to download this content, if other guide storage fringe node does not have corresponding content yet, then ask for this content to content storage center node, send this content the content fringe node of the request of sending to by the content stores Centroid, and and then send the content stores terminal node that needs to download this content to.
2. the method for claim 1 is characterized in that, the content stores Centroid is that the unit is pushed to content whole on the content stores fringe node with the complete file.
3. the method for claim 1, it is characterized in that, the content stores terminal node at first requires to download content to the other guide storage terminal node of this area, if the other guide storage terminal node of this area does not have required content, then ask for this content to other regional content stores terminal nodes, if other regional content stores terminal nodes are this content not also, ask for this content by this content stores terminal node to higher level's content stores fringe node again.
4. the method for claim 1, it is characterized in that, if the content stores fringe node does not have corresponding content when subordinate's content stores terminal node requires to ask for content, then ask for this content to contiguous content stores fringe node, if contiguous content stores fringe node does not have corresponding content yet, then ask for this content to content storage center node.
5. the method for claim 1 is characterized in that, the content stores terminal node obtains various information about content from an information distribution center, sets up P2P then and connects, and carries out the transmission of content.
6. method as claimed in claim 5, it is characterized in that, when certain content is downloaded more and morely, described information distribution center perceives this content and is gradually becoming the focus content, this information distribution center regularly is pushed to the content stores Centroid to the tabulation of focus content, by the content center node described focus contents list is issued to each content stores fringe node again, each content stores fringe node is set up with the P2P of other guide storage fringe node and/or content stores Centroid according to the content of focus contents list and is connected, to obtain the focus content.
7. the method for claim 1, it is characterized in that, each node in described content stores Centroid, content stores fringe node and the content stores terminal node is all regularly to a resource management system report contents list that they had, thereby these nodes are monitored.
8. method as claimed in claim 7, it is characterized in that, the content stores terminal node is learned the situation of change of distribution of content from described resource management system, when required content after this area becomes the focus content gradually, gradually reduce from other regional nodes and obtain this content, then the content stores terminal node to this area obtains this content, thereby this content finally progressively is distributed on the other guide storage terminal node of this area.
9. method according to any one of the preceding claims is characterized in that, the transmission of described content between peer node is to carry out in the mode of burst, obtains complete content by reorganization again.
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