CN110213349A - A kind of HTTP dispatching method and device - Google Patents
A kind of HTTP dispatching method and device Download PDFInfo
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- CN110213349A CN110213349A CN201910413021.9A CN201910413021A CN110213349A CN 110213349 A CN110213349 A CN 110213349A CN 201910413021 A CN201910413021 A CN 201910413021A CN 110213349 A CN110213349 A CN 110213349A
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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
- H04L67/01—Protocols
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
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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
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
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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
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
- H04L67/63—Routing a service request depending on the request content or context
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- Computer Networks & Wireless Communication (AREA)
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- Computer And Data Communications (AREA)
Abstract
The invention discloses a kind of HTTP dispatching method and devices, wherein the described method includes: determining the first mapping relations of resource with the Edge Server that can hit the resource；After receiving the request of the acquisition resource of client transmission, the corresponding object edge server of the resource is determined based on first mapping relations；The IP address of the object edge server is sent to the client.The present invention can greatly save bandwidth shared by Hui Yuan, and improve the speed of response.
Description
Technical field
The present invention relates to CDN technical field, in particular to a kind of HTTP dispatching method and device.
Background technique
Streaming media video industry with Internet technology, terminal technology fast development and rise, generally by CDN
(Content Delivery Network, content distributing network) provides acceleration service for it.When client requests access to Streaming Media
When resource, if not caching the streaming media resource in Edge Server, source station is needed back to obtain content.Usual CDN system is adopted
With DNS (Domain Name System, domain name system) scheduling mode, DNS scheduling uses polling mode, can ask derivation for various
To different Edge Servers, it if requesting access to unexpected winner video, will lead to multiple Hui Yuan, increase bandwidth in-fighting cost.
Summary of the invention
In order to solve problems in the prior art, the embodiment of the invention provides a kind of HTTP dispatching method and devices.It is described
Technical solution is as follows:
In a first aspect, providing a kind of HTTP dispatching method, which comprises
Determine the first mapping relations of resource with the Edge Server that can hit the resource；
After receiving the request of the acquisition resource of client transmission, institute is determined based on first mapping relations
State the corresponding object edge server of resource；
The IP address of the object edge server is sent to the client.
Optionally, the determining resource and the step of the first mapping relations of the Edge Server that can hit the resource,
Include:
The caching resource record in each Edge Server is acquired, and determines that resource takes with the edge for being cached with the resource
Second mapping relations of business device；
The machine performance data of each Edge Server is obtained, and can be used for accelerating based on machine performance data determination
Edge Server；
First mapping relations are determined based on second mapping relations and the Edge Server that can be used for accelerating.
Optionally, the machine performance data includes fault condition and/or bandwidth usage.
Optionally, the method also includes:
After the request for receiving the acquisition HTTP interface that the client is sent, HTTP is distributed for the client and is connect
Mouthful；
The request for the acquisition resource that the client is sent is received by the HTTP interface distributed；
Correspondingly, the step of IP address for sending the object edge server to the client, includes:
The IP address of the object edge server is sent to the client by the HTTP interface that is distributed.
Optionally, described after receiving the request of the acquisition resource of client transmission, it is reflected based on described first
The relationship of penetrating determines the step of resource corresponding object edge server, comprising:
It, can based on the first mapping relations determination after receiving the request of the acquisition resource of client transmission
Hit the Edge Server of the resource；
Determine total Real time request number that the resource is directed in whole Edge Server；
Object edge server is determined from the Edge Server that can hit the resource based on total Real time request number.
Optionally, described to determine target from the Edge Server that hit the resource based on total Real time request number
The step of Edge Server, comprising:
If total Real time request number is less than threshold value, through hash algorithm from the data of first mapping relations
Retrieval obtains the object edge server, is otherwise retrieved and is obtained from the data of first mapping relations by polling mode
The object edge server.
It is optionally, described after receiving the request of the acquisition resource of client transmission, further includes:
If searching the first mapping relations corresponding less than the resource, an edge of table service is distributed by hash algorithm
Device is as object edge server.
Second aspect, provides a kind of HTTP dispatching device, and described device includes:
Preprocessing module, for determining the first mapping relations of resource with the Edge Server that can hit the resource；
Receiving module, the request of the acquisition resource for receiving client transmission；
Scheduler module, for being based on described first after receiving the request of the acquisition resource of client transmission
Mapping relations determine the corresponding object edge server of the resource；
Sending module, for sending the IP address of the object edge server to the client.
Preferably, the preprocessing module, is specifically used for:
The caching resource record in each Edge Server is acquired, and determines that resource takes with the edge for being cached with the resource
Second mapping relations of business device；
The machine performance data of each Edge Server is obtained, and can be used for accelerating based on machine performance data determination
Edge Server；
First mapping relations are determined based on second mapping relations and the Edge Server that can be used for accelerating.
Preferably, the machine performance data includes fault condition and/or bandwidth usage.
Preferably, described device further includes distribution module, and distribution module is used for:
After the request for receiving the acquisition HTTP interface that the client is sent, HTTP is distributed for the client and is connect
Mouthful；
Correspondingly, the receiving module, specifically for receiving what the client was sent by distributed HTTP interface
Obtain the request of the resource；And
The sending module 304, specifically for sending the target to the client by distributed HTTP interface
The IP address of Edge Server.
Preferably, the scheduler module, is specifically used for:
It, can based on the first mapping relations determination after receiving the request of the acquisition resource of client transmission
Hit the Edge Server of the resource；
Determine total Real time request number that the resource is directed in whole Edge Server；
Object edge server is determined from the Edge Server that can hit the resource based on total Real time request number.
Preferably, the scheduler module, is specifically used for:
If total Real time request number is less than threshold value, through hash algorithm from the data of first mapping relations
Retrieval obtains the object edge server, is otherwise retrieved and is obtained from the data of first mapping relations by polling mode
The object edge server.
Preferably, the scheduler module, is also used to:
If searching the first mapping relations corresponding less than the resource, an edge of table service is distributed by hash algorithm
Device is as object edge server
The third aspect, provides a kind of computer equipment, and the computer equipment includes processor and memory, described to deposit
Be stored at least one instruction, at least a Duan Chengxu, code set or instruction set in reservoir, at least one instruction, it is described extremely
A few Duan Chengxu, the code set or instruction set are loaded as the processor and are executed to realize described in above-mentioned first aspect
HTTP dispatching method.
The embodiment of the present invention first carries out pre-allocation process to the caching resource record in each Edge Server, obtains resource
With the mapping relations for the Edge Server that can hit the resource, receive client transmission acquisition resource request after,
It can directly be matched to the Edge Server that can hit the resource from mapping table, can reduce the time-consuming that scheduling calculates, and
Bandwidth shared by Hui Yuan can be greatlyd save, and improves the speed of response.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of network frame schematic diagram provided in an embodiment of the present invention；
Fig. 2 is a kind of flow chart of HTTP dispatching method provided in an embodiment of the present invention；
Fig. 3 is a kind of structural block diagram of HTTP dispatching device provided in an embodiment of the present invention；
Fig. 4 is a kind of structural block diagram of computer equipment provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
The embodiment of the invention provides a kind of HTTP dispatching method, this method can be applied to network frame shown in FIG. 1
In.The network frame includes client, dispatch server and Edge Server.Wherein, Edge Server is used for cache resources,
Such as streaming media resource, and responded after the access request for receiving client transmission.Dispatch server is according to fixation
Period acquires the record of the caching resource in each Edge Server, and is recorded based on the caching resource, determines resource and can order
Described in resource Edge Server mapping relations.Dispatch server is in the acquisition resource for receiving client transmission
After request, the corresponding object edge server of the resource is determined based on the mapping relations, and send target side to the client
The IP address of edge server.To make client to the object edge server request resource, completes CDN and accelerate.
It is a kind of flow chart of HTTP dispatching method provided in an embodiment of the present invention referring to Fig. 2, this method is applied to scheduling
Server, namely executed by dispatch server, this method specifically includes following steps.
Step 201, the first mapping relations of resource with the Edge Server that can hit the resource are determined.
In an implementation, dispatch server first determines first mapping of the resource with the Edge Server that can hit the resource
Relationship, to carry out the pre-allocation process for accelerating service to resource.The detailed process of pre-allocation process include: dispatch server by
The record of the caching resource in each Edge Server is acquired according to the fixed cycle, specifically, each side in the same area can be acquired
Caching resource record in edge server, and the edge for determining resource and being cached with the resource is recorded based on the caching resource
Second mapping relations of server, while the machine performance data of each Edge Server is obtained, and be based on the machine performance
Data determine the Edge Server that can be used for accelerating, and are then based on second mapping relations and the edge that can be used for accelerating
Server determines first mapping relations.
Machine performance data includes fault condition and/or bandwidth usage.In CDN system, there are monitoring system with
And bandwidth acquires center, is respectively used to monitor the fault condition and bandwidth usage of each Edge Server.Monitoring system and
Bandwidth acquisition center periodically sends the fault condition and bandwidth usage of each Edge Server to dispatch server respectively, adjusts
Spend server according to the fault condition and bandwidth usage of each Edge Server, exclude faulty Edge Server and
The higher Edge Server of bandwidth utilization rate, so that it is determined that going out the Edge Server that can be used for accelerating.Then second can be reflected
The Edge Server penetrated in relationship the Edge Server for being cached with the resource and can be used for accelerating makees intersection processing, obtains first
The Edge Server of the resource can be hit in mapping relations.For example, the Edge Server for being cached with the resource include IP1,
IP2 and IP3, the Edge Server that can be used for accelerating include IP1, IP2 and IP4, then obtain the edge clothes that can hit the resource
Business device is IP1 and IP2.Utilize the first mapping relations obtained by pre-allocation process, it is ensured that respond to the side of client
Edge server is also capable of providing the service of high quality while can hit.
Step 202, it after receiving the request of the acquisition resource of client transmission, is closed based on first mapping
System determines the corresponding object edge server of the resource.
Client first sends to dispatch server before sending the request for obtaining resource and obtains HTTP (HyperText
Transfer Protocol, hypertext transfer protocol) interface request.Dispatch server is receiving the client transmission
Acquisition HTTP interface request after, for the client distribute HTTP interface.Client passes through distributed HTTP interface
The request for obtaining resource is sent, dispatch server passes through distributed HTTP interface again and receives the acquisition institute that the client is sent
State the request of resource.
In CDN system, the request of client can also be jumped by DNS scheduling by 302 and be directed to control centre.
And in embodiments of the present invention, client is communicated with dispatch server by HTTP interface, and the request of client is without logical
It crosses DNS scheduling and 302 jumps and can directly reach control centre, improve the speed of response, and for multimedia resource
Request, the first screen first packet time can be reduced.
Dispatch server solves the request after receiving the request of the acquisition resource of client transmission
Analysis, request in resource URL (Uniform Resource Locator, uniform resource locator), based on described first
Mapping relations determination can hit the Edge Server of the resource, then determine in whole Edge Servers for the resource
Total Real time request number is asked in whole Edge Servers for the total of the resource in real time specifically, can determine in the same area
It asks several, then object edge server is determined from the Edge Server that can hit the resource based on the Real time request number.
Dispatch server can be acquired periodically from Edge Server each in the same area for the resource
Real time request number, then sum up the total Real time request number being calculated for the resource.
Dispatch server determines target based on total Real time request number from the Edge Server that can hit the resource
The detailed process of Edge Server are as follows: if total Real time request number is less than threshold value, pass through Hash (hash) algorithm from institute
It states retrieval in the data of the first mapping relations and obtains the object edge server, otherwise reflected by polling mode from described first
It penetrates retrieval in the data of relationship and obtains the object edge server.If total Real time request number is less than threshold value, illustrate
The resource is unexpected winner resource, can select an edge clothes from the Edge Server that can hit the resource by hash algorithm
Device be engaged in as object edge server.If total Real time request number is greater than or equal to the threshold value, illustrate the resource for heat
Door resource, can select an Edge Server as mesh by polling mode from the Edge Server that can hit the resource
Edge Server is marked, to prevent from all for excessive request being directed to same edge of table server, access is caused to overload.Such as it can order
Described in the Edge Server of resource include IP1, IP2 and IP3, if selected by polling mode, for first
Request requests second, then then using the Edge Server of IP1 as object edge server by the Edge Server of IP2
As object edge server, third is requested, then using the Edge Server of IP3 as object edge server.
If dispatch server searches the first mapping relations corresponding less than the resource, an edge of table server is distributed
As object edge server.Specifically, illustrating to be not present if searching the first mapping relations corresponding less than the resource
The Edge Server of the resource can be hit, an edge of table can be selected from the Edge Server in the same area by hash algorithm
Edge server selects an edge of table server to make as object edge server, or from the Edge Server that can be used for accelerating
For object edge server.It is this to guarantee that resource is buffered in together as far as possible by way of hash algorithm allocations of edge server
In one edge of table server, cause Hui Yuan without excessively spreading.
Step 203, Xiang Suoshu client sends the IP address of the object edge server.
Preferably, dispatch server sends the target side to the client by the HTTP interface distributed for client
The IP address of edge server.
After client receives the IP address of object edge server, the money is requested to the object edge server
Source, object edge server are responded upon receiving the request.
It should be noted that above-mentioned HTTP dispatching method can be executed by individual server, it can also be by server
Group executes.When by server group to execute, different servers can execute the part process in HTTP dispatching method, example
Such as, data acquisition server, for acquiring the Real time request number of the record of the caching resource in Edge Server and resource；Decision
Server for obtaining the machine performance data of Edge Server, and determines according to the machine performance data and can be used for acceleration
Edge Server.
The embodiment of the present invention first carries out pre-allocation process to the caching resource record in each Edge Server, obtains resource
With the mapping relations for the Edge Server that can hit the resource, receive client transmission acquisition resource request after,
It can directly be matched to the Edge Server that can hit the resource from mapping table, can reduce the time-consuming that scheduling calculates, and
Bandwidth shared by Hui Yuan can be greatlyd save, and improves the speed of response.
It is a kind of structural block diagram of HTTP dispatching device provided in an embodiment of the present invention referring to Fig. 3, described device is configured at
It in dispatch server, or is dispatch server itself, described device includes:
Preprocessing module 301, for determining the first mapping relations of resource with the Edge Server that can hit the resource；
Receiving module 302, the request of the acquisition resource for receiving client transmission；
Scheduler module 303, for after receiving the request of the acquisition resource of client transmission, based on described the
One mapping relations determine the corresponding object edge server of the resource；
Sending module 304, for sending the IP address of the object edge server to the client.
Preferably, the preprocessing module 301, is specifically used for:
The caching resource record in each Edge Server is acquired, and determines that resource takes with the edge for being cached with the resource
Second mapping relations of business device；
The machine performance data of each Edge Server is obtained, and can be used for accelerating based on machine performance data determination
Edge Server；
First mapping relations are determined based on second mapping relations and the Edge Server that can be used for accelerating.
Preferably, the machine performance data includes fault condition and/or bandwidth usage.
Preferably, described device further includes distribution module, and distribution module is used for:
After the request for receiving the acquisition HTTP interface that the client is sent, HTTP is distributed for the client and is connect
Mouthful；
Correspondingly, the receiving module 302, sends specifically for receiving the client by distributed HTTP interface
The acquisition resource request；And
The sending module 304, specifically for sending the target to the client by distributed HTTP interface
The IP address of Edge Server.
Preferably, the scheduler module 303, is specifically used for:
It, can based on the first mapping relations determination after receiving the request of the acquisition resource of client transmission
Hit the Edge Server of the resource；
Determine total Real time request number that the resource is directed in whole Edge Server；
Object edge server is determined from the Edge Server that can hit the resource based on total Real time request number.
Preferably, the scheduler module 303, is specifically used for:
If total Real time request number is less than threshold value, through hash algorithm from the data of first mapping relations
Retrieval obtains the object edge server, is otherwise retrieved and is obtained from the data of first mapping relations by polling mode
The object edge server.
Preferably, the scheduler module 303, is also used to:
If searching the first mapping relations corresponding less than the resource, an edge of table service is distributed by hash algorithm
Device is as object edge server.
The embodiment of the present invention first carries out pre-allocation process to the caching resource record in each Edge Server, obtains resource
With the mapping relations for the Edge Server that can hit the resource, receive client transmission acquisition resource request after,
It can directly be matched to the Edge Server that can hit the resource from mapping table, can reduce the time-consuming that scheduling calculates, and
Bandwidth shared by Hui Yuan can be greatlyd save, and improves the speed of response.
It should be understood that HTTP dispatching device provided by the above embodiment is when carrying out HTTP scheduling, only with above-mentioned each
The division progress of functional module can according to need and for example, in practical application by above-mentioned function distribution by different function
Energy module is completed, i.e., the internal structure of device is divided into different functional modules, to complete whole described above or portion
Divide function.In addition, HTTP dispatching device provided by the above embodiment and HTTP dispatching method embodiment belong to same design, have
Body realizes that process is detailed in embodiment of the method, and which is not described herein again.
Fig. 4 is the structural block diagram of computer equipment provided in an embodiment of the present invention.The computer equipment 400 can because configuration or
Performance is different and generates bigger difference, may include one or more central processing units 422 (for example, one or one
A above processor) and memory 432, the storage medium 430 of one or more storage application programs 442 or data 444
(such as one or more mass memory units).Wherein, memory 432 and storage medium 430 can be it is of short duration storage or
Persistent storage.The program for being stored in storage medium 430 may include one or more modules (diagram does not mark), Mei Gemo
Block may include to the series of instructions operation in electronic equipment.Further, central processing unit 422 can be set to and deposit
Storage media 430 communicates, and the series of instructions operation in storage medium 430 is executed in computer equipment 400.
Computer equipment 400 can also include one or more power supplys 424, one or more are wired or wireless
Network interface 450, one or more input/output interfaces 458, one or more keyboards 454, and/or, one or
More than one operating system 441, such as Windows ServerTM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM
Etc..
Computer equipment 400 may include have memory and one perhaps more than one program one of them or
More than one program is stored in memory, and be configured to be executed by one or more than one processor it is one or
More than one program includes the instruction for carrying out above-mentioned log processing.
Those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can store in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of HTTP dispatching method, which is characterized in that the described method includes:
Determine the first mapping relations of resource with the Edge Server that can hit the resource；
After receiving the request of the acquisition resource of client transmission, the money is determined based on first mapping relations
The corresponding object edge server in source；
The IP address of the object edge server is sent to the client.
2. the method according to claim 1, wherein the determining resource takes with the edge that can hit the resource
The step of first mapping relations of business device, comprising:
The caching resource record in each Edge Server is acquired, and determines resource and the Edge Server for being cached with the resource
The second mapping relations；
The machine performance data of each Edge Server is obtained, and determines the side that can be used for accelerating based on the machine performance data
Edge server；
First mapping relations are determined based on second mapping relations and the Edge Server that can be used for accelerating.
3. according to the method described in claim 2, it is characterized in that, the machine performance data includes fault condition and/or band
Wide service condition.
4. the method according to claim 1, wherein the method also includes:
After the request for receiving the acquisition HTTP interface that the client is sent, HTTP interface is distributed for the client；
The request for the acquisition resource that the client is sent is received by the HTTP interface distributed；
Correspondingly, the step of IP address for sending the object edge server to the client, includes::
The IP address of the object edge server is sent to the client by the HTTP interface that is distributed.
5. the method according to claim 1, wherein described in the acquisition resource for receiving client transmission
Request after, the step of determining the resource corresponding object edge server based on first mapping relations, comprising:
After receiving the request of the acquisition resource of client transmission, it can be hit based on the first mapping relations determination
The Edge Server of the resource；
Determine total Real time request number that the resource is directed in whole Edge Server；
Object edge server is determined from the Edge Server that can hit the resource based on total Real time request number.
6. according to the method described in claim 5, it is characterized in that, described described from that can hit based on total Real time request number
The step of object edge server is determined in the Edge Server of resource, comprising:
If total Real time request number is less than threshold value, retrieved from the data of first mapping relations by hash algorithm
The object edge server is obtained, is otherwise retrieved from the data of first mapping relations by polling mode described in obtaining
Object edge server.
7. the method according to claim 1, wherein described in the acquisition resource for receiving client transmission
Request after, further includes:
If searching the first mapping relations corresponding less than the resource, an edge of table server is distributed by hash algorithm and is made
For object edge server.
8. a kind of HTTP dispatching device, which is characterized in that described device includes:
Preprocessing module, for determining the first mapping relations of resource with the Edge Server that can hit the resource；
Receiving module, the request of the acquisition resource for receiving client transmission；
Scheduler module, for being mapped based on described first after receiving the request of the acquisition resource of client transmission
Relationship determines the corresponding object edge server of the resource；
Sending module, for sending the IP address of the object edge server to the client.
9. device according to claim 8, which is characterized in that the preprocessing module is specifically used for::
The caching resource record in each Edge Server is acquired, and determines resource and the Edge Server for being cached with the resource
The second mapping relations；
The machine performance data of each Edge Server is obtained, and determines the side that can be used for accelerating based on the machine performance data
Edge server；
First mapping relations are determined based on second mapping relations and the Edge Server that can be used for accelerating.
10. a kind of computer equipment, which is characterized in that the computer equipment includes processor and memory, the memory
In be stored at least one instruction, at least a Duan Chengxu, code set or instruction set, at least one instruction, described at least one
Duan Chengxu, the code set or instruction set are loaded by the processor and are executed to realize as described in claim 1 to 7 is any
HTTP dispatching method.
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| CN111614717A (en) * | 2020-04-10 | 2020-09-01 | 网宿科技股份有限公司 | File access scheduling method and central server |
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| CN114448960A (en) * | 2021-12-27 | 2022-05-06 | 天翼云科技有限公司 | Scheduling system, method, device, equipment and medium |
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| CN106131229A (en) * | 2016-09-20 | 2016-11-16 | 贵州白山云科技有限公司 | The processing method of CDN business, equipment and communication system |
| CN108075922A (en) * | 2016-11-14 | 2018-05-25 | 普天信息技术有限公司 | A kind of telecommunication network management system |
| CN107483614A (en) * | 2017-08-31 | 2017-12-15 | 京东方科技集团股份有限公司 | Content scheduling method and communication network based on CDN Yu P2P networks |
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| CN110830564B (en) * | 2019-10-30 | 2022-11-01 | 北京金山云网络技术有限公司 | CDN scheduling method, device, system and computer readable storage medium |
| CN111614717A (en) * | 2020-04-10 | 2020-09-01 | 网宿科技股份有限公司 | File access scheduling method and central server |
| CN111614736A (en) * | 2020-04-30 | 2020-09-01 | 北京金山云网络技术有限公司 | Network content resource scheduling method, domain name scheduling server and electronic equipment |
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