CN102291447A - Content distribution network load scheduling method and system - Google Patents
Content distribution network load scheduling method and system Download PDFInfo
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- CN102291447A CN102291447A CN2011102231539A CN201110223153A CN102291447A CN 102291447 A CN102291447 A CN 102291447A CN 2011102231539 A CN2011102231539 A CN 2011102231539A CN 201110223153 A CN201110223153 A CN 201110223153A CN 102291447 A CN102291447 A CN 102291447A
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Abstract
The invention discloses a content distribution network load scheduling method and system. The method comprises the following steps: a content distribution network receives a content request sent by a user terminal; a global load balancing unit selects a local load balancing unit according to the first selection strategy by use of the network information provided by an application layer flow optimization server; the local load balancing unit selects an edge cache apparatus according to the second selection strategy; the content distribution network redirects the content request to the edge cache apparatus, and distributes the content to the edge cache apparatus; and the edge cache apparatus distributes the content to the user terminal according to the content request. As the network information provided by the application layer flow optimization server reflects the information of network topology, network flow and the like more accurately, the global load balancing unit can direct the user request to the nearest node or region so that the content distribution network can provide the nearest service to the user better.
Description
Technical field
The present invention relates to the Network Transmission field, particularly relate to content distributing network load allocation method and system.
Background technology
(Content Delivery Network, be called for short: CDN) technology is a kind of content to be distributed to fringe node near the user from central server to content distributing network, thereby realizes the distributed method of visit nearby of content.The CDN technology has effectively improved the service quality of access to content, and can support large-scale concurrent visit.
The key technology of CDN mainly contains content route technology, content distribution techniques etc.
1. content route technology
The CDN SiteServer LBS is realized the content routing function of CDN.Its effect is with the optimal node in user's the content requests guiding whole C DN network.The selected of optimal node can carry out according to multiple strategy, and be for example nearest, node load is the lightest, link bandwidth is high and link cost is low etc.SiteServer LBS is the core of whole C DN, and the accuracy of load balancing and efficient have directly determined efficient and the performance of whole C DN.
The existing C DN network architecture as shown in Figure 1.Usually load balancing is divided into two levels: (Global Service Load Balance is called for short: GSLB) and local load balancing (Service Load Balance, abbreviation: SLB) GSLB.The main purpose of GSLB is in whole network range user's request to be directed to nearest node or zone.Therefore, property judgement nearby is the major function of GSLB.SLB generally is confined in the certain areal extent, its target is to seek an optimal node service is provided in specific regional extent, therefore, the running statuses such as media formats of the health of CDN node, loading condition, support are the main foundations that local load balancing is made a strategic decision.
Load balancing can be passed through accomplished in many ways, and main method comprises that (Domain Name System is called for short: DNS), application layer is redirected, transport layer is redirected or the like domain name system.
For GSLB, in order to carry out property judgement nearby, adopt dual mode usually, a kind of is static setting, for example (Internet Protocol, be called for short: IP) the address setting table carries out the mapping of IP address to the CDN node according to the Internet protocol of static state.Another kind of mode is dynamic detection, for example allow the CDN node detect the distance of Target IP in real time, the linear module of distance can adopt relative retention time, and (Relative Retention Time, be called for short: RRT) or jump (Hops), the comparison detection result carries out load balancing then.Certainly, static state and dynamic mode also can integrate use.
For SLB,, need obtain buffer memory (Cache) equipment running status in real time in order to carry out effective decision-making.The method of obtaining generally has two kinds, and a kind of is active probe, and a kind of is protocol interaction.Active probe does not have the situation of protocol interaction interface at SLB equipment and buffer memory equipment, initiatively initiates to survey by orders such as ping, according to the return results analysis state.Another kind is a protocol interaction, i.e. SLB and the buffer memory equipment agreement real-time exchange running state information good according to predefined is so that carry out load balancing.Comparatively speaking, protocol interaction ratio detection mode will be accurately and reliably, but still do not have the agreement of standard at present, and the realization of each producer generally only is a proprietary protocol, and intercommunication is difficulty relatively.
2. content distribution techniques
Content distribution package contains the process of the buffer memory equipment from content source to the CDN edge.On realizing, the content distribution techniques of two kinds of main flows is arranged: push PUSH and pull PULL.
PUSH is a kind of technology of active distribution.Usually, PUSH is initiated by Content Management System, with content from the source or the center media resources bank be distributed to the cache node at each edge.The agreement of distribution can adopt HTML (Hypertext Markup Language), and (HyperText Transfer Protocol is called for short: HTTP)/(File Transfer Protocol is called for short: FTP) etc. file transfer protocol (FTP).
PULL is a kind of passive distribution technology, and the PULL distribution is asked to drive by the user usually.When the content of user request did not exist on the edge of this locality buffer memory equipment or be miss, buffer memory device start PULL method was obtained content in real time from content source or other CDN nodes.Under the PULL mode, the distribution of content is as required.
Existing CDN is when carrying out load allocating, usually do not consider the positional information of present network topology and node, even consideration is perhaps arranged, but information source often is oneself collects, the network condition of reaction is inaccurate, therefore upgrade untimelyly, can't service nearby is provided, can not effectively utilize Internet resources for the user well.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of content distributing network load allocation method and system, thereby can effectively utilize Internet resources more, promotes the service quality of CDN.
According to an aspect of the present invention, provide a kind of content distributing network load dispatching method, comprising:
GSLB unit in the content distributing network receives the content requests that user terminal sends;
Described GSLB unit by using application layer traffic is optimized the network information that server provides, according to the local load balancing unit in the first selection strategy chosen content distributing network;
Described local load balancing unit is according to the edge buffer memory equipment in the second selection strategy chosen content distributing network;
Described GSLB unit is redirected to described edge buffer memory equipment with described content requests;
Content distributing network is distributed to described edge buffer memory equipment with content;
Described edge buffer memory equipment is distributed to user terminal according to described content requests with described content.
According to a further aspect in the invention, provide a kind of GSLB unit, this GSLB unit comprises receiving element, selected cell and scheduling unit, wherein:
Receiving element is used to receive the content requests that user terminal sends;
Selected cell, the network information that being used for utilizing application layer traffic to optimize server provides is selected the local load balancing unit of content distributing network according to first selection strategy; And indicate described local load balancing unit to select edge buffer memory equipment in the content distributing network according to second selection strategy;
Scheduling unit is used for described content requests is redirected to described edge buffer memory equipment.
According to a further aspect in the invention, provide a kind of application layer traffic to optimize server, this server comprises information receiving unit, query unit, information transmitting unit, wherein:
Information receiving unit is used to receive the query messages that is used to inquire about current network information that the GSLB unit sends;
Query unit is used for the described query messages requester network information that receives according to described information receiving unit;
Information transmitting unit is used for sending the network information that query unit is inquired about to described GSLB unit.
According to a further aspect of the invention, provide a kind of content distributing network load dispatch system, it comprises that GSLB unit, application layer traffic optimize server, Dispatching Unit, a plurality of local load balancings unit, a plurality of edges buffer memory equipment, wherein:
The GSLB unit, be used to receive the content requests that user terminal sends, utilize application layer traffic to optimize the network information that server provides, select local load balancing unit in the content distributing network according to first selection strategy, and indicate described local load balancing unit to select edge buffer memory equipment in the content distributing network according to second selection strategy, described content requests is redirected to described edge buffer memory equipment;
Dispatching Unit is used for content is distributed to described edge buffer memory equipment;
Application layer traffic is optimized server, and the query messages that is used for inquiring about according to described GSLB cell arrangement being used to of sending current network information provides the network information to the GSLB list;
The local load balancing unit is used for selecting according to described second selection strategy edge buffer memory equipment of content distributing network;
Edge buffer memory equipment is used for the content that the storage distribution unit is distributed, and distributes described content according to described content requests to user terminal.
The network information that the present invention provides by the GSLB unit by using ALTO server among the CDN is selected SLB unit among the CDN according to selection strategy, because the network information that the ALTO server provides reflects information such as network topology, network traffics more accurately, thereby the GSLB unit can be in the scope of CDN be directed to nearest node or zone with user's request, thereby CDN provides service nearby for the user better, and has effectively utilized Internet resources.
Description of drawings
Fig. 1 is the schematic diagram of the CDN network architecture in the prior art.
Fig. 2 is the schematic diagram of an embodiment of CDN load dispatching method of the present invention.
Fig. 3 registers the schematic diagram of an embodiment in the ALTO server for CDN of the present invention.
Fig. 4 is the schematic diagram of ALTO server of the present invention to an embodiment of CDN informing network information change.
Fig. 5 is the schematic diagram of another embodiment of CDN load dispatching method of the present invention.
Fig. 6 is the schematic diagram of the embodiment in GSLB of the present invention unit.
Fig. 7 is the schematic diagram of GSLB of the present invention another embodiment of unit.
Fig. 8 is the schematic diagram of GSLB of the present invention another embodiment of unit.
Fig. 9 is the schematic diagram of an embodiment of ALTO server of the present invention.
Figure 10 is the schematic diagram of another embodiment of ALTO server of the present invention.
Figure 11 is the schematic diagram of another embodiment of ALTO server of the present invention.
Figure 12 is the schematic diagram of a CDN load dispatch embodiment of system of the present invention.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention wherein is described.
Fig. 2 is the schematic diagram of an embodiment of CDN load dispatching method of the present invention.As shown in Figure 2, the CDN load dispatching method of this embodiment is as follows:
The content distributing network load allocation method that provides based on the above embodiment of the present invention, the network information that provides by the GSLB unit by using ALTO server among the CDN is selected SLB unit among the CDN according to selection strategy, because the network information that the ALTO server provides reflects information such as network topology, network traffics more accurately, thereby the GSLB unit can be in the scope of CDN be directed to nearest node or zone with user's request, thereby CDN provides service nearby for the user better, and has effectively utilized Internet resources.
It is a kind of based on client/server (Client/Server that the ALTO technology provides, be called for short: the C/S) network information service of framework, be mainly equity (peer to peer, be called for short: P2P) class is provided by the service that provides, P2P uses a lot of resource providers, in the selection of resource provider, have a lot alternative, it needs some mechanism to help it to carry out the selection of resource provider, by obtaining network topology accurately, the selection that information such as network traffics are carried out resource provider is a good idea, present application has a lot of methods can the detection network topology and information such as network traffics, but these are not very accurate based on the information that the detection forecast method obtains, and the expense of these work is also bigger, influences the performance of overall applicability.The purpose of ALTO allow exactly to use and network provider between cooperate effectively, improving or keeping under the high-performance condition that P2P uses more effectively and justice is utilized Internet resources.
Because original ALTO information faces is the P2P business to service object, real-time to information updating is less demanding, but ALTO information is applied to the CDN field, because the CDN carrying all is important service, usually the flow of its carrying is also very big, and the variation of any network all should be notified in the CDN network timely.
For the ALTO server, under the P2P environment, the number of ALTO client computer is very many, the difficulty and the expense that design a kind of reliable informing mechanism are very big, but in the applied environment of CDN, the number of CDN provider is less relatively, can carry out the notice of ALTO business information by the mode of registration notification.Under this change, the ALTO business no longer is a communication service based on client/server (C/S) mode, and become a kind of can be initiatively and the service of ALTO client communication.
Consider the Virtual network operator often of in real network, disposing the ALTO business, and often there is close contact in CDN provider with Virtual network operator, the ALTO business may be a kind of charge operation, therefore in a specific embodiment of the present invention, the login mechanism of CDN can be an off-line, CDN producer and ALTO service supplier signature service contract, switched communication address after signing a contract, information such as port, thereby the update notifications of realization ALTO business.In another specific embodiment of the present invention, the login mechanism of CDN can be online, and as shown in Figure 3, CDN registers in the ALTO server by registration interface.
In another specific embodiment of content distributing network load dispatching method of the present invention, the network information that GSLB unit by using ALTO server provides was selected local load balancing unit in the content distributing network according to first selection strategy before, CDN offered application layer traffic with mailing address, port information and optimizes server to register.As shown in Figure 3, CDN sends register requirement RegisterReq to the ALTO server, and the ALTO server sends registration reply RegisterRes according to register requirement to CDN.
After registration process is finished, the ALTO server will know mailing address, the port information of the CDN that is hopeful in time to be notified, when the network information changes, the ALTO server can be notified as shown in Figure 4 one by one, as shown in Figure 4, when the network information changed, the ALTO server was to the CDN NewPolicyNotify that sends a notification message.Thereby the ALTO server can offer CDN with the situation of change of the network information.
In another specific embodiment of content distributing network load dispatching method of the present invention, first selection strategy and second selection strategy comprise with user terminal nearest, edge buffer memory apparatus of load is the lightest, link bandwidth is high, at least one strategy in the strategy set of link cost in low.
Fig. 5 is the schematic diagram of another embodiment of CDN load dispatching method of the present invention.As shown in Figure 5, the CDN load dispatching method of this embodiment is as follows:
Another specific embodiment according to the present invention, the query messages that the GSLB unit sends to the ALTO server comprise the information such as the professional GetEpProp of endpoint attribute of inquiring about new network map GetMap, network cost GetCost or ALTO.
CDN is after obtaining the network information that the ALTO server provides, by using the map business (map service) of ALTO business, the accurately access way of awareness network topology information, network cost information and terminal and the information on services of access capability, and these information are placed in the load-balancing algorithm of GSLB, just realize user's access ability nearby, and preferentially select high bandwidth, low-cost link.
For example, the network information that the ALTO server provides comprises that network topological diagram is connected cost figure with node, GSLB can go out network cost between user and the different SLB according to these information calculations, and the SLB of the cost minimum of service can be provided providing for this user according to this process.For example this user is A, and the SLB unit among the CDN is respectively SLB1, SLB2 and SLB3, and the network cost between user A and the SLB1 is 4, be cost (A, SLB1)=4, the network cost between user A and the SLB2 is 5, i.e. cost (A, SLB2)=5, network cost between user A and the SLB3 is 6, promptly cost (A, SLB3)=6, according to the minimum principle of cost, GSLB can select SLB1 and provide service for user A.
In addition, the endpoint attribute business (Endpoint Property Service) of CDN by obtaining ALTO can be understood user's access module, thereby service more targetedly can be provided in the selection of fringe node.
Another specific embodiment according to the present invention, the network information that CDN provides the ALTO server is selected the override information of SLB unit as the GSLB unit.Be that the GSLB unit preferentially uses the network information that the ALTO server provides to select suitable SLB unit.
The another specific embodiment according to the present invention, CDN also can preferentially use the load algorithm of oneself, promptly find out the lower CDN zone of load among the CDN earlier by the GSLB unit, the network information that using the ALTO server again in this CDN zone provides is selected suitable SLB unit.
Another specific embodiment according to the present invention, edge memory device can adopt to push the PUSH mode or pull the PULL mode and according to content requests content be distributed to user terminal.
Another specific embodiment according to the present invention, first selection strategy and second selection strategy comprise with user terminal nearest, edge buffer memory apparatus of load is the lightest, link bandwidth is high, at least one strategy in the strategy set of link cost in low.
Another specific embodiment according to the present invention, the network information that GSLB unit by using ALTO server provides was selected SLB unit among the CDN according to selection strategy before, the GSLB unit offered the ALTO server to register with mailing address, port information.Thereby the ALTO server just can send to the GSLB unit with the network information according to this mailing address, port information.
Another specific embodiment according to the present invention, registration can be adopted offline mode or online mode.
In the above-described embodiments, the GSLB unit network information that can utilize the ALTO server to provide updates stored in the network information in the data buffering storehouse.
Another specific embodiment according to the present invention, when the CDN initialization, when arriving predetermined updated time or GSLB unit and receiving the NewPolicyNotify that the ALTO server sends, the GSLB unit can send the query messages that obtains new internet message to the ALTO server, for example inquires about the professional GetEpProp message of endpoint attribute of new network map GetMap, network cost GetCost or ALTO etc.
The ALTO server provides the network information according to query messages to the GSLB unit, and this network information of GSLB unit by using is upgraded the network information of storing in the data buffering storehouse.
Fig. 6 is the schematic diagram of the embodiment in GSLB of the present invention unit.As shown in Figure 6, this GSLB unit comprises receiving element 601, selected cell 602, scheduling unit 603, wherein:
Receiving element 601 is used to receive the content requests that user terminal sends;
The GSLB unit that provides based on the above embodiment of the present invention, select SLB unit among the CDN by utilizing the network information that the ALTO server provides according to selection strategy, because the network information that the ALTO server provides reflects information such as network topology, network traffics more accurately, thereby the GSLB unit can be in the scope of CDN be directed to nearest node or zone with user's request, thereby CDN provides service nearby for the user better.
Another specific embodiment according to the present invention, first selection strategy and second selection strategy comprise with user terminal nearest, edge buffer memory apparatus of load is the lightest, link bandwidth is high, at least one strategy in the strategy set of link cost in low.
After CDN obtains the network information that the ALTO server provides, by using the map business (map service) of ALTO business, can understand whole topology of networks, and these information are placed in the load-balancing algorithm of GSLB, realize user's access ability nearby, and preferentially select high bandwidth, low-cost link.
In addition, the endpoint attribute business (Endpoint Property Service) of CDN by obtaining ALTO can be understood user's access module, thereby service more targetedly can be provided in the selection of fringe node.
Another specific embodiment according to the present invention, the network information that selected cell 602 provides the ALTO server is selected the override information of SLB as GSLB.Be the network information that provides of the preferential ALTO of use of selected cell 602 servers and select suitable SLB unit according to first selection strategy.
The another specific embodiment according to the present invention, selected cell 602 also can preferentially use the load algorithm of oneself, find out the lower CDN zone of load among the CDN earlier, the network information that using the ALTO server again in this CDN zone provides is selected suitable SLB unit according to first selection strategy.
Fig. 7 is the schematic diagram of GSLB of the present invention another embodiment of unit.In Fig. 7, receiving element 601, selected cell 602 and scheduling unit 603 are identical with scheduling unit 603 with receiving element 601, selected cell 602 in embodiment illustrated in fig. 6.In the present embodiment, the GSLB unit also comprises transmitting element 701, judging unit 702, data buffering storehouse 703, wherein,
Transmitting element 701 is used for being used to inquire about the query messages of current network information to the transmission of ALTO server.
Judging unit 702, be used for after receiving element 601 receives the content requests of user terminal transmission, whether store the network information relevant in the judgment data buffer pool 703 with content requests, when data buffering storehouse 703 have the network information relevant with content requests simultaneously this network information do not have expiredly, the network information that judging unit 702 indication selected cells 602 directly utilize storage in the data buffering storehouse 703 is selected SLB unit among the CDN according to first selection strategy.
If when the network information not relevant in the data buffering storehouse 703 with content requests, perhaps data buffering storehouse 703 has the network information relevant with content requests but this network information when expired, indication transmitting element 701 sends query messages to the ALTO server, and indication selected cell 602 network information that is provided by the ALTO server of utilizing that receiving element 601 receives is selected SLB unit among the CDN according to first selection strategy.
Another specific embodiment according to the present invention, transmitting element 701 offers the ALTO server to register with mailing address, port information.After registration process is finished, the ALTO server will know the Notify Address of the CDN that is hopeful in time to be notified, when the network information changes, the ALTO server can be notified as shown in Figure 4 one by one, as shown in Figure 4, when the network information changed, the ALTO server was to the CDN NewPolicyNotify that sends a notification message, thereby the ALTO server can offer CDN with the situation of change of the network information.
Another specific embodiment according to the present invention, the query messages that transmitting element 701 sends to the ALTO server comprise network map GetMap, network cost GetCost that inquiry is new or the professional GetEpProp message of endpoint attribute of ALTO etc.
Fig. 8 is the schematic diagram of GSLB of the present invention another embodiment of unit.In Fig. 8, receiving element 601, selected cell 602, scheduling unit 603, transmitting element 701, judging unit 702, data buffering storehouse 703 are identical with receiving element 601, selected cell 602, scheduling unit 603, transmitting element 701, judging unit 702, data buffering storehouse 703 in embodiment illustrated in fig. 7.In the present embodiment, the GSLB unit also comprises updating block 801, and the network information that is used for utilizing the ALTO server to provide updates stored in the network information in data buffering storehouse 702.
According to another specific embodiment of the present invention, when CDN carries out initialization or reach predetermined updated time, perhaps when receiving element 601 receives the NewPolicyNotify of ALTO server transmission, updating block 801 indication transmitting elements 701 send query messages to the ALTO server, and the network information that is provided by the ALTO server of utilizing that receiving element 601 receives updates stored in the network information in the data buffering storehouse 703.
Fig. 9 is the schematic diagram of an embodiment of ALTO server of the present invention.As shown in Figure 9, the ALTO server of this embodiment comprises information receiving unit 901, query unit 902 and information transmitting unit 903, wherein:
The ALTO server that provides based on the above embodiment of the present invention, the network information that provides by the GSLB unit by using ALTO server among the CDN is selected SLB unit among the CDN according to selection strategy, because the network information that the ALTO server provides reflects information such as network topology, network traffics more accurately, thereby the GSLB unit can be in the scope of CDN be directed to nearest node or zone with user's request, thereby CDN provides service nearby for the user better, and has effectively utilized Internet resources.
Figure 10 is the schematic diagram of another embodiment of ALTO server of the present invention.As shown in figure 10, information receiving unit 901, query unit 902 and information transmitting unit 903 are identical with information transmitting unit 903 with information receiving unit 901, query unit 902 shown in Figure 9.In the present embodiment, the ALTO server also comprises detecting unit 1001, be used to detect the network information and whether change, and when the network information send to change indication information transmitting element 903 to the CDN NewPolicyNotify that sends a notification message, so that CDN awareness network change in information situation.
Figure 11 is the schematic diagram of another embodiment of ALTO server of the present invention.As shown in figure 11, information receiving unit 901, query unit 902, information transmitting unit 903 and detecting unit 1001 are identical with detecting unit 1001 with information receiving unit 901, query unit 902, information transmitting unit 903 shown in Figure 10.In the present embodiment, the ALTO server also comprises registering unit 1101, be used for receiving log-on message that the GSLB unit send so that the GSLB unit is registered, and indication information transmitting element 903 can utilize the mailing address, the port address that comprise in the log-on message to send the network information or communication information to the GSLB unit by information receiving unit 901.
Figure 12 is the schematic diagram of CDN load dispatch of the present invention system, and as shown in figure 12, this system comprises GSLB unit 1201, ALTO server 1202, Dispatching Unit 1203, a plurality of SLB unit 1204, a plurality of edges buffer memory equipment 1205, wherein:
Edge buffer memory equipment 1205 is used for the content that storage distribution unit 1203 is distributed, and distributes described content according to content requests to user terminal.
The CDN load dispatch system that provides based on the above embodiment of the present invention, the network information that provides by the GSLB unit by using ALTO server among the CDN is selected SLB unit among the CDN according to selection strategy, because the network information that the ALTO server provides reflects information such as network topology, network traffics more accurately, thereby the GSLB unit can be in the scope of CDN be directed to nearest node or zone with user's request, thereby CDN provides service nearby for the user better, and has effectively utilized Internet resources.
According to another specific embodiment of the present invention, GSLB unit 1201 specifically can be realized to the GSLB unit of arbitrary specific embodiment shown in Figure 8 by Fig. 6.
According to another specific embodiment of the present invention, ALTO server 1202 specifically can be by the ALTO server realization of Fig. 9 to arbitrary specific embodiment shown in Figure 11.
Another specific embodiment according to the present invention, the Dispatching Unit 1203 concrete modes that push PUSH or pull PULL that adopt are distributed to user terminal with content.
The present invention obtains the corresponding network information by CDN from the ALTO server, the maintenance and the use that have realized the network information are separated, reduced the development difficulty of content routing algorithm among the CDN, for CDN provides reliable network aware service and client perception service, make CDN that service nearby can be provided better, simultaneously can effectively avoid the alternate route of CDN in transmission, avoid congested highway section, help CDN to carry out professional equilibrium and system deployment.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment that have various modifications that the present invention's design is suitable for special-purpose.
Claims (30)
1. a content distributing network load dispatching method is characterized in that, comprising:
GSLB unit in the content distributing network receives the content requests that user terminal sends;
Described GSLB unit by using application layer traffic is optimized the network information that server provides, according to the local load balancing unit in the first selection strategy chosen content distributing network;
Described local load balancing unit is according to the edge buffer memory equipment in the second selection strategy chosen content distributing network;
Described GSLB unit is redirected to described edge buffer memory equipment with described content requests;
Content distributing network is distributed to described edge buffer memory equipment with content;
Described edge buffer memory equipment is distributed to user terminal according to described content requests with described content.
2. method according to claim 1 is characterized in that,
After the GSLB unit receives content requests, judge and whether store the network information relevant in the data buffering storehouse in the content distributing network with described content requests, if described data buffering storehouse have the network information relevant with described content requests simultaneously this network information do not have expired, the GSLB unit directly utilizes the network information of storing in the described data buffering storehouse, select local load balancing unit in the content distributing network according to described first selection strategy, wherein the network information of storing in the data buffering storehouse is optimized the network information that server provides for application layer traffic.
3. method according to claim 2 is characterized in that,
When if described data buffering storehouse the network information not relevant with described content requests, perhaps described data buffering storehouse has the network information relevant with described content requests but this network information when expired, the GSLB unit is optimized the server transmission to application layer traffic and is used to inquire about the query messages of current network information, application layer traffic is optimized server provides the network information according to query messages to the GSLB unit, GSLB unit by using application layer traffic is optimized the network information that server provides, and selects local load balancing unit in the content distributing network according to described first selection strategy.
4. according to each described method among the claim 1-3, it is characterized in that,
Described first selection strategy and second selection strategy adopt at least one strategy in the strategy set, wherein strategy set comprise with user terminal nearest, edge buffer memory apparatus of load is the lightest, link bandwidth is high, link cost is low.
5. according to claim 2 or 3 described methods, it is characterized in that,
The network information that GSLB unit by using application layer traffic is optimized server to be provided updates stored in the network information in the described data buffering storehouse.
6. method according to claim 5 is characterized in that,
When the content distributing network initialization or arrive predetermined updated time, the GSLB unit is optimized the server transmission to application layer traffic and is used to inquire about the query messages of current network information, application layer traffic is optimized server provides the network information according to query messages to the GSLB unit, and the network information that GSLB unit by using application layer traffic is optimized server to be provided updates stored in the network information in the data buffering storehouse.
7. method according to claim 5 is characterized in that,
When the GSLB unit receives application layer traffic when optimizing the notification message that the expression network information that server sends changes, the GSLB unit is optimized the server transmission according to described notification message to application layer traffic and is used to inquire about the query messages of current network information, application layer traffic is optimized server provides the network information according to query messages to the GSLB unit, and the network information that GSLB unit by using application layer traffic is optimized server to be provided updates stored in the network information in the data buffering storehouse.
8. method according to claim 1 is characterized in that,
Optimize the network information that server provides in GSLB unit by using application layer traffic, select before the local load balancing unit in the content distributing network according to first selection strategy, the GSLB unit offers application layer traffic with mailing address, port information and optimizes server to register, and application layer traffic is optimized the described mailing address of server by utilizing, port information provides the network information to the GSLB unit.
9. method according to claim 8 is characterized in that, offline mode or online mode are adopted in described registration.
10. method according to claim 4 is characterized in that,
Described GSLB unit by using application layer traffic is optimized the network information that server provides, the local load balancing unit of selecting in the content distributing network according to first selection strategy comprises: the GSLB unit at first calculates the low zone of load in the content distributing network, utilize application layer traffic to optimize the network information that server provides again, in the low zone of described load, select local load balancing unit in the content distributing network according to described first selection strategy.
11. method according to claim 4 is characterized in that,
Described GSLB unit by using application layer traffic is optimized the network information that server provides, the local load balancing unit of selecting in the content distributing network according to first selection strategy comprises: the GSLB unit preferentially utilizes application layer traffic to optimize the network information that server provides, and selects local load balancing unit in the content distributing network according to described first selection strategy.
12. method according to claim 4 is characterized in that,
The GSLB unit is optimized the endpoint attribute business information that comprises in the network information that server provides with application layer traffic and is sent to the local load balancing unit, and edge buffer memory equipment in the content distributing network is selected according to second selection strategy and in conjunction with described endpoint attribute business information in the local load balancing unit.
13. according to each described method among the claim 1-3, it is characterized in that,
Content distributing network adopts to push the PUSH mode or pull the PULL mode content is distributed to described edge buffer memory equipment.
14. a GSLB unit is characterized in that, this GSLB unit comprises receiving element, selected cell and scheduling unit, wherein:
Receiving element is used to receive the content requests that user terminal sends;
Selected cell, the network information that being used for utilizing application layer traffic to optimize server provides is selected the local load balancing unit of content distributing network according to first selection strategy; And indicate described local load balancing unit to select edge buffer memory equipment in the content distributing network according to second selection strategy;
Scheduling unit is used for described content requests is redirected to described edge buffer memory equipment.
15. GSLB according to claim 14 unit is characterized in that, described GSLB unit also comprises judging unit and data buffering storehouse, wherein:
The data buffering storehouse is used to store application layer traffic and optimizes the network information that server provides;
Judging unit, be used for after described receiving element receives described content requests, judge and whether store the network information relevant in the data buffering storehouse in the content distributing network with described content requests, if described data buffering storehouse have the network information relevant with described content requests simultaneously this network information do not have expired, indicate described selected cell directly to utilize the network information of storing in the described data buffering storehouse, select local load balancing unit in the content distributing network according to described first selection strategy.
16. GSLB according to claim 15 unit is characterized in that, described GSLB unit also comprises transmitting element, is used for optimizing server to application layer traffic and sends query messages, the network information that the request inquiry is current;
Described judging unit also is used for when described data buffering storehouse the network information not relevant with described content requests, perhaps described data buffering storehouse has the network information relevant with described content requests but this network information when expired, indicate described transmitting element to optimize the server transmission and be used to inquire about the query messages of current network information to application layer traffic, and indicate that described selected cell utilizes that described receiving element receives optimize the network information that server provides by application layer traffic, select local load balancing unit in the content distributing network according to described first selection strategy.
17. according to each described GSLB unit among the claim 14-16, it is characterized in that, described first selection strategy and second selection strategy adopt at least one strategy in the strategy set, wherein strategy set comprise with user terminal nearest, edge buffer memory apparatus of load is the lightest, link bandwidth is high, link cost is low.
18. according to claim 15 or 16 described GSLB unit, it is characterized in that, described GSLB unit also has updating block, and the network information that being used for utilizing application layer traffic to optimize server provides updates stored in the network information in described data buffering storehouse.
19. GSLB according to claim 18 unit, it is characterized in that, described updating block is also when the content distributing network initialization or arrive predetermined updated time, indicate described transmitting element to optimize server and send and be used to inquire about the query messages of current network information, and the network information of being optimized server and being provided by application layer traffic of utilizing that described receiving element receives updates stored in the network information in the described data buffering storehouse to application layer traffic.
20. GSLB according to claim 18 unit, it is characterized in that, described updating block also receives application layer traffic when optimizing the notification message that the expression network information that server sends changes at described receiving element, indicate described transmitting element to optimize server to application layer traffic and send and be used to inquire about the query messages of current network information, and the network information of being optimized server and being provided by application layer traffic of utilizing that described receiving element receives updates stored in the network information in the data buffering storehouse according to described notification message.
21. GSLB according to claim 14 unit, it is characterized in that, described transmitting element utilizes application layer traffic to optimize the network information that server provides at described selected cell, select before the local load balancing unit in the content distributing network according to first selection strategy, mailing address, port information are offered application layer traffic optimize server to register.
22. GSLB according to claim 17 unit, it is characterized in that, described selected cell at first calculates the low zone of load in the content distributing network, utilizes application layer traffic to optimize the network information that server provides again and select local load balancing unit in the content distributing network according to first selection strategy in the low zone of described load.
23. GSLB according to claim 17 unit, it is characterized in that, described selected cell preferentially utilizes application layer traffic to optimize the network information that server provides, and selects local load balancing unit in the content distributing network according to first selection strategy.
24. an application layer traffic is optimized server, it is characterized in that this server comprises information receiving unit, query unit, information transmitting unit, wherein:
Information receiving unit is used to receive the query messages that is used to inquire about current network information that the GSLB unit sends;
Query unit is used for the described query messages requester network information that receives according to described information receiving unit;
Information transmitting unit is used for sending the network information that query unit is inquired about to described GSLB unit.
25. server according to claim 24, it is characterized in that, whether this server also comprises detecting unit, be used to detect the network information and change, and the indication information transmitting element sends a notification message to described GSLB unit when the network information sends variation.
26. according to claim 24 or 25 described servers, it is characterized in that, described server also comprises registering unit, be used for described GSLB unit being registered, and mailing address, the port information of indicating described information transmitting unit to utilize to comprise in the described log-on message send the network information or notification message to described GSLB unit according to the log-on message that the GSLB unit sends.
27. a content distributing network load dispatch system is characterized in that, comprises GSLB unit, application layer traffic optimization server, Dispatching Unit, a plurality of local load balancings unit, a plurality of edges buffer memory equipment, wherein:
The GSLB unit, be used to receive the content requests that user terminal sends, utilize application layer traffic to optimize the network information that server provides, select local load balancing unit in the content distributing network according to first selection strategy, and indicate described local load balancing unit to select edge buffer memory equipment in the content distributing network according to second selection strategy, described content requests is redirected to described edge buffer memory equipment;
Dispatching Unit is used for content is distributed to described edge buffer memory equipment;
Application layer traffic is optimized server, and the query messages that is used for inquiring about according to described GSLB cell arrangement being used to of sending current network information provides the network information to the GSLB list;
The local load balancing unit is used for selecting according to described second selection strategy edge buffer memory equipment of content distributing network;
Edge buffer memory equipment is used for the content that the storage distribution unit is distributed, and distributes described content according to described content requests to user terminal.
28. system according to claim 27 is characterized in that, the GSLB unit is each described GSLB unit among the claim 14-23.
29. system according to claim 27 is characterized in that, it is that each described application layer traffic is optimized server among the claim 24-26 that application layer traffic is optimized server.
30. system according to claim 27 is characterized in that, Dispatching Unit specifically adopts to push the PUSH mode or pull the PULL mode content is distributed to described edge buffer memory equipment.
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