CN106230942A - A kind of method and system of time source access - Google Patents
A kind of method and system of time source access Download PDFInfo
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- CN106230942A CN106230942A CN201610621904.5A CN201610621904A CN106230942A CN 106230942 A CN106230942 A CN 106230942A CN 201610621904 A CN201610621904 A CN 201610621904A CN 106230942 A CN106230942 A CN 106230942A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
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Abstract
The present invention discloses the method and system of a kind of time source access, relates to communication technical field, can solve back the slow problem of source response.The embodiment of the present invention sends content query requests by GSLB system to Centroid, and whether content query requests stores, for Deictic Center querying node self, the data that terminal needs to access, and then GSLB system receives the content search result that Centroid sends；When content search result is not for inquiring, GSLB system determines back source mode, returning source mode and include that Centroid returns source and terminal Hui Yuan, Centroid Hui Yuan is for directly to be carried out Hui Yuan by Centroid to source station, and terminal Hui Yuan is for directly to be carried out Hui Yuan by terminal to source station.The scheme that the embodiment of the present invention provides is suitable to back use when source accesses.
Description
Technical field
The present invention relates to communication technical field, particularly relate to the method and system of a kind of time source access.
Background technology
CDN (Content Delivery Network, content distributing network) is by placing node clothes everywhere at network
One layer of intelligent virtual network that business device is constituted.CDN can be in real time according to network traffics and the connection of each node, load state
And to the integrated information such as the distance of terminal and response time, the content access request of terminal is redirected into from terminal nearest
Fringe node on, to select the fringe node from terminal relative close to provide business service for terminal, and then alleviate network and gather around
The situation squeezed, improves the response speed of website.
When fringe node is when responding the content access request of terminal, if this fringe node this locality does not has terminal to need to visit
The content asked, then this fringe node needs to source station to carry out Hui Yuan, the content accessed to obtain terminal to need, and provides the terminal with industry
Business service.In prior art, fringe node to source station carries out the detailed process of Hui Yuan and is: terminal sends content to fringe node and visits
Asking request, fringe node does not inquires the content that terminal needs to access in this locality, then forward this access to content to ask to Area Node
Asking, Area Node does not inquires the content that terminal needs to access in this locality, then forward content query requests, center to Centroid
Node does not inquires the content that terminal needs to access in this locality, then send back source access request to source station, and terminal is needed by source station
The content accessed is supplied to Centroid, and terminal is needed the content accessed to be supplied to Area Node, Area Node by Centroid
Need the content accessed to be supplied to fringe node terminal, fringe node provide the terminal with business service.
Visible, in time source procedure of fringe node to source station, need via accessing fringe node, Area Node and center
Node is inquired about step by step, when Centroid is after source station gets the content needing to access, then returns the content needing to access step by step,
The cycle causing back source to respond is longer, speed is slower.
Summary of the invention
Embodiments of the invention provide the method and system of a kind of time source access, and the speed that can solve back source response is slower
Problem.
For reaching above-mentioned purpose, embodiments of the invention adopt the following technical scheme that
A kind of method of time source access, described method is applied in content distributing network CDN, and described method includes:
GSLB GSLB system sends content query requests to Centroid, and described content query requests is used for referring to
Show whether the inquiry of described Centroid self stores the data that terminal needs access；
Described GSLB system receives the content search result that described Centroid sends；
When described content search result is not for inquiring, described GSLB system determines back source mode, described time source mode
Go back to source and terminal Hui Yuan including Centroid, described Centroid Hui Yuan for directly to be carried out Hui Yuan by Centroid to source station,
Described terminal Hui Yuan is for directly to be carried out Hui Yuan by terminal to source station.
A kind of system of time source access, described system includes:
GSLB system, for sending content query requests to Centroid, described content query requests is used for indicating described
Whether Centroid inquiry self stores the data that terminal needs to access；
Described Centroid, for receiving the content query requests that described GSLB system sends；Inquire about whether self stores
Terminal needs the data accessed；
Described GSLB system, is additionally operable to receive the content search result that described Centroid sends；When described content search
When result is not for inquiring, determining back source mode, described time source mode includes that Centroid returns source and terminal Hui Yuan, described in
Heart node Hui Yuan is for directly to be carried out Hui Yuan by Centroid to source station, and described terminal Hui Yuan is for directly to be carried out back to source station by terminal
Source；
Described Centroid, is additionally operable to send content search result to described GSLB system.
What the embodiment of the present invention provided returns the method and system that source accesses, and GSLB system sends to Centroid and is used for indicating
Whether Centroid inquiry self stores terminal needs the content query requests of the data accessed, and receives what Centroid sent
Content search result, when content search result is not for inquiring, GSLB system determines back source mode, and returning source mode is centromere
The source of putting back or terminal Hui Yuan, Centroid Hui Yuan is for directly to be carried out Hui Yuan by Centroid to source station, and terminal Hui Yuan is direct
Hui Yuan is carried out by terminal to source station.With prior art, return the speed relatively slow phase ratio of source response, in the embodiment of the present invention, GSLB
System determines a kind of time source mode, and when centered by time source mode, node goes back to source, Centroid directly arrives source station and carries out Hui Yuan, for
User provides business service, when return source mode be terminal go back to source time, terminal directly arrives source station and carries out Hui Yuan, and source station provides the user
Business service, it is seen then which kind of no matter uses return source mode, Centroid all without via Area Node and fringe node step by step to
Terminal returns the data that terminal needs to access, and shortens back the cycle of source response, improves back the speed of source response.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
The flow chart of the method that a kind of time source that Fig. 1 provides for the embodiment of the present invention accesses；
Fig. 2 returns the flow chart of the method that source accesses for the another kind that the embodiment of the present invention provides；
Fig. 3 returns the flow chart of the method that source accesses for the another kind that the embodiment of the present invention provides；
Fig. 4 returns the flow chart of the method that source accesses for the another kind that the embodiment of the present invention provides；
The logical structure schematic diagram of the system that a kind of time source that Fig. 5 provides for the embodiment of the present invention accesses；
Fig. 6 returns the logical structure schematic diagram of the system that source accesses for the another kind that the embodiment of the present invention provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
In order to promote back the speed of source response, the method embodiments providing a kind of time source access, it is applied to CDN
In, as it is shown in figure 1, the method includes:
101, GSLB (Global Server Load Balance, GSLB) system is in Centroid sends
Holding inquiry request, whether content query requests stores, for Deictic Center querying node self, the data that terminal needs to access.
It should be noted that in the embodiment of the present invention, after GSLB receives domain name mapping request, it is not necessary to directly choose limit
Edge node is that user services, but sends content query requests to Centroid, to determine in Centroid whether there is terminal
Need the data accessed, and then determine the need for carrying out back source access, it is to avoid whether exist in uncertain fringe node
Terminal is user's allocations of edge node on the premise of needing the data accessed, and the situation causing back source procedure complex occurs.
102, GSLB system receives the content search result that Centroid sends.
It is understood that node self does not store the data that terminal needs to access centered by content search result, or
Centroid self stores the data that terminal needs to access.
103, when content search result is not for inquiring, GSLB system determines back source mode, returns source mode and includes center
Node returns source and terminal Hui Yuan.
Wherein, Centroid Hui Yuan is for directly to be carried out Hui Yuan by Centroid to source station, and terminal Hui Yuan is directly by terminal
Hui Yuan is carried out to source station.It should be noted that node self does not store terminal and needs to access centered by the content search result
Data time, GSLB system determines back source mode, Centroid or terminal directly carry out Hui Yuan.
When centered by content search result, node self stores the data that terminal needs access, GSLB system is by center
The IP address of node is sent to terminal by local dns server, and terminal is sent out to Centroid according to the IP address of Centroid
Sending content access request, need the data accessed with requesting terminal, Centroid is to terminal returned content access response, for user
Thering is provided business service, in the response of this access to content, carried terminal needs the data accessed, and to accelerate the access speed of website, meets
The demand of user.If a certain content is in Preset Time, be not requested by a user access, then Centroid also can delete this content,
To alleviate the load of Centroid.
It should be noted that step 103 is not limited to only be provided a user with business service by Centroid, Centroid is also
Terminal can need the data accessed send to Area Node, and terminal can be needed the data accessed to send further by Area Node
To fringe node, Area Node, fringe node all can provide the user business service.
What the embodiment of the present invention provided returns the method that source accesses, and GSLB system sends to Centroid and saves for Deictic Center
Whether some inquiry self stores terminal needs the content query requests of the data accessed, and the content receiving Centroid transmission is looked into
Asking result, when content search result is not for inquiring, GSLB system determines back source mode, and returning source mode is Centroid Hui Yuan
Or terminal Hui Yuan.Fringe node, Area Node and Centroid is needed to inquire about step by step also with the source procedure that returns of prior art
Returning result, cause back the speed relatively slow phase ratio that source responds, in the embodiment of the present invention, GSLB system is without directly choosing edge joint
Point services for user, but sends content query requests to Centroid, whether there are terminal needs to determine in Centroid
Data accessed, and then determine the need for carrying out back source access, it is to avoid whether there is user in uncertain fringe node
Need on the premise of the content accessed just for user's allocations of edge node, cause back the situation appearance that source procedure is complex, and
Which kind of no matter uses return source mode, and Centroid is all without needing to terminal return user step by step via Area Node and fringe node
Content to be accessed, shortens back the cycle of source response, improves back the speed of source response.
The method flow of Fig. 1 is to perform after the process of terminal initiated domain name analysis request, so, real in the present invention
Execute example provide another kind of implementation in, above-mentioned steps 101, GSLB system to Centroid send content query requests it
Before, as in figure 2 it is shown, also need to perform step 201 to 202.
201, GSLB system receives the domain name mapping request that local dns server forwards.
Wherein, domain name mapping request is carried the domain name of user's input.
It should be noted that domain name mapping request is sent by terminal, it is therefore an objective to obtain in asking with this domain name mapping and carry
IP (Internet Protocol, Internet protocol) address corresponding to domain name, such as, user is in the browser of terminal, defeated
When entering " www.abc.com " this domain name and key in enter key, if terminal cannot complete the parsing to this domain name, then by this domain name
Analysis request is forwarded to local dns server, and local dns server, in the IP address self stored, does not inquires and this territory
The IP address that name is corresponding, then be forwarded to source station DNS authorization server by this domain name mapping request, source station DNS authorization server to
Local dns server returns to field name analysis responds, and carries the GSLB system of the CDN contracted with this source station in this domain name mapping response
CNAME domain name, such as www.abc.cc.com, local dns server according to the CNAME domain name of the GSLB system obtained, to
This domain name mapping of GSLB system forwards is asked.
202, GSLB system generates content query requests according to domain name mapping request.
GSLB system is relevant with the domain name carried in this domain name mapping request according to domain name mapping request and self storage
Information, generate content query requests.
Additionally, in order to, while promoting back the speed of source response, the load to current CDN does not produces bigger shadow
Ringing, also need when determining back source mode to consider current network condition, based on this, the another kind provided in the embodiment of the present invention is real
In existing mode, as in figure 2 it is shown, above-mentioned steps 103, GSLB system determines back source mode, specifically can be embodied as step 1031 to
1033。
1031, GSLB system determines current network load situation.
Wherein, current network load situation includes: the load state of Centroid and the load state of CDN, CDN net
The load state of network refers to the link circuit condition etc. between the load state of each node, user and node.GSLB system is by above-mentioned shape
Condition carries out comprehensive descision, determines the load state of current network, and selects suitably to return source mode, provides the user business clothes
Business.Specifically, step 1032 or 1033 can be embodied as.
1032, when current network load situation is congested, GSLB system determines back that source mode is terminal Hui Yuan.
1033, when current network load situation is non-congested, GSLB system determines back node Hui Yuan centered by the mode of source.
What the embodiment of the present invention provided returns the method that source accesses, and GSLB system can select according to the load state of current network
Suitably return source mode, provide the user business service, while improving back source speed, will not be to the load at CDN networking
Produce large effect, make transmission speed faster, more stable.
It is understood that on the basis of the method flow shown in Fig. 1 or Fig. 2, determine back source mode in GSLB system
Afterwards, source procedure can be carried out back according to the source mode of returning determined, in a kind of implementation that the embodiment of the present invention provides, as
Shown in Fig. 3, when centered by time source mode, node goes back to source, in above-mentioned steps 103, after GSLB system determines back source mode, also
Following steps 104 to 108 need to be performed.
104, when centered by time source mode, node goes back to source, GSLB system passes through local dns server to terminal sending domain
Name analysis responds, and carries the IP address of Centroid in domain name mapping response.
105, terminal sends content access request according to the IP address of Centroid to Centroid.
Wherein, content access request needs the data accessed for requesting terminal.
It should be noted that content access request is embodied in, terminal is according to the IP address of Centroid and this center
Node is set up TCP (Transmission Control Protocol, transmission control protocol) and is connected, and needs to visit with requesting terminal
The data asked.
106, Centroid sends back source request according to content access request to source station.
Wherein, the data that source request needs to access are returned for requesting terminal.
It is understood that Centroid local not storage terminal needs the data accessed, need to source station request eventually
End needs the data accessed.
It should be noted that Centroid and time source interface address of source station are pre-configured fixing addresses.
107, source station sends back source response to Centroid, and returning carried terminal in the response of source needs the data accessed.
108, Centroid sends access to content response, carried terminal in access to content response according to the source of returning response to terminal
Need the data accessed.
It should be noted that step 108 is not limited to be provided a user with business service by Centroid, Centroid is also
Terminal can need the data accessed send to Area Node, and terminal can be needed the data accessed to send further by Area Node
To fringe node, Area Node, fringe node all can provide the user business service.
It should be noted that above-mentioned steps 104 to 108, being non-congested in current network conditions, GSLB system determines Hui Yuan
Centered by mode, node performs when going back to source.
The embodiment of the present invention provide another kind of implementation in, as shown in Figure 4, when return source mode be terminal Hui Yuan
Time, in above-mentioned steps 103, after GSLB system determines back source mode, also need to perform following steps 401 to 403.
401, when return source mode be terminal go back to source time, GSLB system by local dns server to terminal send domain name solution
Analysis response, carries the IP address of source station in domain name mapping response.
402, terminal sends content access request according to the IP address of source station to source station, and content access request is used for asking end
End needs the data accessed.
403, source station sends back source response to terminal, and returning carried terminal in the response of source needs the data accessed.
It should be noted that owing to current network conditions is congested, source station directly provides the user business service, Bu Huizeng
Adding the load of CDN, after user's access terminates, Centroid can carry out statistical analysis according to the number of times that user accesses,
If after the number of times accessed reaches preset times, determining that this content is hot content, Centroid can ask this content to source station
And cache to local, terminal also can be needed the data accessed to send to Area Node by Centroid, and Area Node can be by user
Needing the content accessed to send further to fringe node, Centroid, Area Node, fringe node can user again
When request accesses this content, provide the user business service, it is not necessary to again carry out the process of Hui Yuan, improve access speed.
It should be noted that above-mentioned steps 401 to 403, being congested in current network conditions, GSLB system determines Hui Yuanfang
Formula is that terminal performs when going back to source.
What the embodiment of the present invention provided returns the method that source accesses, and GSLB system determines a kind of time source mode, when returning source mode
Centered by node when going back to source, Centroid directly arrives source station and carries out Hui Yuan, provides the user business service, be end when returning source mode
When holding go back to source, terminal directly arrives source station and carries out Hui Yuan, provides the user business service, it is seen then which kind of no matter uses return source mode,
Centroid all without returning, to terminal, the data that terminal needs to access step by step via Area Node and fringe node, shortens back
In the cycle of source response, improve back the speed of source response.
Corresponding to the method flow shown in Fig. 1, in order to promote back the speed of source response, embodiments provide one
The system that the source of returning accesses, as it is shown in figure 5, this system includes: GSLB system 501, Centroid 502.
GSLB system 501, for sending content query requests to Centroid 502, content query requests is in instruction
Heart node 502 inquires about self whether to store the data that terminal needs to access.
Centroid 502, for receiving the content query requests that GSLB system 501 sends；Inquire about whether self stores end
End needs the data accessed.
GSLB system 501, is additionally operable to receive the content search result that Centroid 502 sends；When content search result is
When not inquiring, determining back source mode, return source mode and include that Centroid returns source and terminal Hui Yuan, Centroid Hui Yuan is straight
Connecing and carried out Hui Yuan by Centroid 502 to source station, terminal Hui Yuan is for directly to be carried out Hui Yuan by terminal to source station.
Centroid 502, is additionally operable to send content search result to GSLB system 501.
In an alternative embodiment of the invention, as shown in Figure 6, this system also includes: local dns server 503, terminal 504,
Source station 505.
Local dns server 503, for forwarding domain name mapping to ask to GSLB system 501.
GSLB system 501, is additionally operable to receive the domain name mapping request that local dns server 503 forwards；According to domain name mapping
Request generates content query requests；Determine current network load situation；When current network load situation is congested, determine Hui Yuan
Mode is terminal Hui Yuan；When current network load situation is non-congested, determine back node Hui Yuan centered by the mode of source；Work as Hui Yuan
When centered by mode, node goes back to source, being responded to terminal 504 sending domain name analysis by local dns server 503, domain name mapping rings
The IP address of Centroid 502 is carried in Ying.
Local dns server 503, is additionally operable to receive the domain name mapping response that GSLB system 501 sends；To 504 turns of terminal
Send out domain name mapping response.
Terminal 504, is additionally operable to receive the domain name mapping response that local dns server 503 forwards；According to Centroid 502
IP address send content access request to Centroid 502, content access request for requesting terminal 504 need access number
According to.
Centroid 502, is additionally operable to receive the content access request that terminal 504 sends；According to content access request to source
Stand 505 send back source request, return source request for requesting terminal 504 need access data.
Source station 505, is additionally operable to receive source of the returning request that Centroid 502 sends；Send back source to Centroid 502 to ring
Should, returning carried terminal 504 in the response of source needs the data accessed.
Centroid 502, is additionally operable to be received back to source response；Access to content response is sent to terminal 504 according to the source of returning response,
In access to content response, carried terminal 504 needs the data accessed.
Terminal 504, is additionally operable to receive access to content response.
GSLB system 501, be additionally operable to when return source mode be terminal go back to source time, by local dns server to 504, terminal
Send domain name mapping to respond, domain name mapping response is carried the IP address of source station 505.
Local dns server 503, is additionally operable to receive the domain name mapping response that GSLB system 501 sends；To 504 turns of terminal
Send out domain name mapping response.
Terminal 504, is additionally operable to receive the domain name mapping response that local dns server 503 forwards；IP according to source station 505
Address sends content access request to source station 505, and content access request needs the data accessed for requesting terminal 504.
Source station 505, is additionally operable to receive the content access request that terminal 504 sends；Send back source response to terminal 504, return
In the response of source, carried terminal 504 needs the data accessed.
Terminal 504, is additionally operable to be received back to source response.
What the embodiment of the present invention provided returns the system that source accesses, and GSLB system sends to Centroid and saves for Deictic Center
Whether some inquiry self stores terminal needs the content query requests of the data accessed, and the content receiving Centroid transmission is looked into
Asking result, when content search result is not for inquiring, GSLB system determines back source mode, and returning source mode is Centroid Hui Yuan
Or terminal Hui Yuan, Centroid Hui Yuan is for directly to be carried out Hui Yuan by Centroid to source station, and terminal Hui Yuan is directly by terminal
Hui Yuan is carried out to source station.With prior art, returning the speed relatively slow phase ratio of source response, in the embodiment of the present invention, GSLB system is true
Fixed one returns source mode, and when centered by time source mode, node goes back to source, Centroid directly arrives source station and carries out Hui Yuan, carries for user
For business service, when return source mode be terminal go back to source time, terminal directly arrive source station and carries out Hui Yuan, and source station provides the user business and takes
Business, it is seen then which kind of no matter uses return source mode, and Centroid is all without returning to terminal step by step via Area Node and fringe node
Return the data that terminal needs to access, shorten back the cycle of source response, improve back the speed of source response.
Through the above description of the embodiments, those skilled in the art is it can be understood that can borrow to the present invention
The mode helping software to add required common hardware realizes, naturally it is also possible to by hardware, but a lot of in the case of the former is more preferably
Embodiment.Based on such understanding, the portion that prior art is contributed by technical scheme the most in other words
Dividing and can embody with the form of software product, this computer software product is stored in the storage medium that can read, such as meter
The floppy disk of calculation machine, hard disk or CD etc., including some instructions with so that computer equipment (can be personal computer,
Server, or the network equipment etc.) perform the method described in each embodiment of the present invention.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art, in the technical scope that the invention discloses, can readily occur in change or replace, should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (10)
1. one kind is returned the method that source accesses, it is characterised in that described method is applied in content distributing network CDN, described method
Including:
GSLB GSLB system sends content query requests to Centroid, and described content query requests is used for indicating institute
State whether Centroid inquiry self stores the data that terminal needs to access；
Described GSLB system receives the content search result that described Centroid sends；
When described content search result is not for inquiring, described GSLB system determines back source mode, and described time source mode includes
Centroid returns source and terminal Hui Yuan, and described Centroid Hui Yuan is for directly to be carried out Hui Yuan by Centroid to source station, described
Terminal Hui Yuan is for directly to be carried out Hui Yuan by terminal to source station.
The method of the most according to claim 1 time source access, it is characterised in that send out to Centroid in described GSLB system
Before sending content query requests, described method also includes:
Described GSLB system receives the domain name mapping request that local domain name system dns server forwards；
Described GSLB system generates described content query requests according to domain name analysis request.
The method of the most according to claim 2 time source access, it is characterised in that described GSLB system determines back source mode bag
Include:
Described GSLB system determines current network load situation；
When described current network load situation is congested, described GSLB system determines that described source mode of returning is terminal Hui Yuan；
When described current network load situation is non-congested, centered by described GSLB system determines described time source mode, node returns
Source.
The method that the most according to claim 3 time source accesses, it is characterised in that described GSLB determine back source mode it
After, described method also includes:
When centered by described time source mode, node goes back to source, described GSLB system passes through local dns server to terminal sending domain
Name analysis responds, and carries the internet protocol address of described Centroid in domain name resolution response；
Terminal sends content access request according to the IP address of described Centroid to described Centroid, and described access to content please
Seek the data needing to access for requesting terminal；
Described Centroid sends back source request according to described content access request to described source station, and described time source request is for asking
Terminal is asked to need the data accessed；
Described source station sends back source response to described Centroid, and in described time source response, carried terminal needs the data accessed；
Described Centroid sends access to content response according to described time source response to described terminal, in the response of described access to content
Carried terminal needs the data accessed.
The method that the most according to claim 3 time source accesses, it is characterised in that described GSLB determine back source mode it
After, described method also includes:
When described time source mode be terminal go back to source time, described GSLB system sends domain name solution by local dns server to terminal
Analysis response, carries the IP address of described source station in domain name resolution response；
Terminal sends content access request according to the IP address of described source station to described source station, and described content access request is for asking
Terminal is asked to need the data accessed；
Described source station sends back source response to described terminal, and in described time source response, carried terminal needs the data accessed.
6. one kind is returned the system that source accesses, it is characterised in that described system includes:
GSLB system, for sending content query requests to Centroid, described content query requests is used for indicating described center
Whether querying node self stores the data that terminal needs to access；
Described Centroid, for receiving the content query requests that described GSLB system sends；Inquire about whether self stores terminal
Need the data accessed；
Described GSLB system, is additionally operable to receive the content search result that described Centroid sends；When described content search result
During for not inquiring, determine back that source mode, described time source mode include that Centroid returns source and terminal Hui Yuan, described centromere
Point Hui Yuan is for directly to be carried out Hui Yuan by Centroid to source station, and described terminal Hui Yuan is for directly to be carried out Hui Yuan by terminal to source station；
Described Centroid, is additionally operable to send content search result to described GSLB system.
The system of the most according to claim 6 time source access, it is characterised in that described system also includes: local dns service
Device；
Described local dns server, for described GSLB system forwards domain name analysis request；
Described GSLB system, is additionally operable to receive the domain name mapping request that described local dns server forwards；According to domain name solution
Analysis request generates described content query requests.
The system of the most according to claim 7 time source access, it is characterised in that
Described GSLB system, is additionally operable to determine current network load situation；When described current network load situation is congested, really
Fixed described source mode of returning is terminal Hui Yuan；When described current network load situation is non-congested, determine that described source mode of returning is
Centroid Hui Yuan.
The system of the most according to claim 8 time source access, it is characterised in that
Described GSLB system, when being additionally operable to that node goes back to source centered by described time source mode, by local dns server to terminal
Sending domain name analysis responds, and carries the IP address of described Centroid in domain name resolution response；
Described local dns server, is additionally operable to receive the domain name resolution response that described GSLB system sends；To described terminal
Forward domain name resolution response；
Described terminal, is additionally operable to receive the domain name resolution response that described local dns server forwards；According to described centromere
The IP address of point sends content access request to described Centroid, and described content access request needs for requesting terminal to access
Data；
Described Centroid, is additionally operable to receive the described content access request that described terminal sends；Please according to described access to content
Asking and send back source request to described source station, described time source request needs the data accessed for requesting terminal；
Described source station, is additionally operable to receive the described time source request that described Centroid sends；Source is sent back to described Centroid
Response, in described time source response, carried terminal needs the data accessed；
Described Centroid, is additionally operable to receive described source of going back to and responds；Send content according to described time source response to described terminal to visit
Asking response, in the response of described access to content, carried terminal needs the data accessed；
Described terminal, is additionally operable to receive the response of described access to content.
The system of the most according to claim 8 time source access, it is characterised in that
Described GSLB system, be additionally operable to when described time source mode be terminal go back to source time, sent to terminal by local dns server
Domain name mapping responds, and carries the IP address of described source station in domain name resolution response；
Described local dns server, is additionally operable to receive the domain name resolution response that described GSLB system sends；To described terminal
Forward domain name resolution response；
Described terminal, is additionally operable to receive the domain name resolution response that described local dns server forwards；According to described source station
IP address sends content access request to described source station, and described content access request needs the data accessed for requesting terminal；
Described source station, is additionally operable to receive the described content access request that described terminal sends；Source response is sent back to described terminal,
In described time source response, carried terminal needs the data accessed；
Described terminal, is additionally operable to receive described source of going back to and responds.
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