CN104320410A - All-service CDN system based on HTTP and working method thereof - Google Patents
All-service CDN system based on HTTP and working method thereof Download PDFInfo
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- CN104320410A CN104320410A CN201410629161.7A CN201410629161A CN104320410A CN 104320410 A CN104320410 A CN 104320410A CN 201410629161 A CN201410629161 A CN 201410629161A CN 104320410 A CN104320410 A CN 104320410A
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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
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/45—Network directories; Name-to-address mapping
- H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
- H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
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Abstract
The invention discloses an all-service CDN system based on the HTTP and a working method of the all-service CDN system based on the HTTP. The all-service CDN system based on the HTTP and the working method of the all-service CDN system based on the HTTP solve the problems that a traditional CDN supports only one service, has only one scheduling policy and can hardly meet the demands for mass digital media services. The system is mainly composed of a stream media processing module, a center node, an edge acceleration caching node and an intelligent DNS module. The stream media processing module can process various media streams and unify the media streams into stream media section files which can be issued on the CDN based on the HTTP. The center node supports active issuing and passive pulling down of the CDN system. The storage efficiency and the hit rate of a server cluster are improved through the unique caching function, based on P2P, of the edge acceleration caching node. The intelligent DNS module carries out global dispatching on the basis of a node load condition and a link state, so that the purposes of shortening delay for a user when the user has access to a CDN node, lowering the data flow of backbone networks, and guaranteeing the high availability and the high stability of the CDN are achieved.
Description
Technical field
The present invention relates to applications of computer network technology, specifically a kind of full-service CDN system based on HTTP and method of work thereof.
Background technology
The full name of CDN is Content Delivery Network, i.e. content distributing network.Its objective is by increasing one deck intelligent virtual network in existing Internet, the content of website is published to the network " edge " closest to user, make user can obtain required content nearby, solve Internet network congestion condition, improve the response speed of user's access websites, make originally unordered, poor efficiency, insecure broadband IP network is transformed into efficiently, reliable intelligent network, solve technically because the network bandwidth is little comprehensively, user's visit capacity is large, the unequal problem caused of network point distribution, solve the essential measure that the response speed of user's access websites is slow.
Current web realizes by figure, audio/video information set in one, and user only just need can obtain the information wanted by web browser.Nowadays the network application based on HTTP has accounted for more than 80 percent of network traffics, so based on the CDN(Content Delivery Network of HTTP, content distributing network) acceleration service solves the network optimization, the topmost business of content efficient distribution.
But also there are following defects in traditional C DN solution:
(1) based on single business, technical system is closed.A set of CDN system can only carry out single acceleration to a certain business.(as: webpage accelerates CDN, video accelerates CDN, file transfer accelerates CDN etc.);
(2) scheduling and routing policy single, distribute efficiency not high.Be difficult to realize optimizing distribution according to the real-time dynamic conditioning strategy of bearer network state.Transmission algorithm is not optimized in distribution procedure, causes the efficiency of transmission in distribution procedure lower.
(3) be difficult to support mass digital media business demand.Existing CDN system does not have a set of good memory technology and Media Stream treatment technology to accelerate to support video.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of full-service CDN system based on HTTP and method of work thereof, system solves the problem that traditional C DN supporting business is single, scheduling strategy is single and is difficult to support the problem of mass digital media business demand.
A kind of full-service CDN system based on HTTP of the present invention, comprises Streaming Media processing module, Centroid, edge acceleration cache node, intelligent DNS module, wherein:
Streaming Media processing module, this module is deployed in CDN system foremost, for receiving and various types of video source in process source station, the unified Streaming Media be treated as based on HTTP transmission, and cut into slices;
Centroid: connect Streaming Media processing module, source station and each edge and accelerate cache node, is responsible for the storage of content, management and the whole network distribution, and processes the content injected source station;
Edge accelerates cache node: i.e. buffer service module, disposes near user by region, the content of distribute from Centroid for buffer memory or oneself active content drop-down to source station, and provides service to user; The temperature of the accessed resource of edge caching nodes record, so as from source station drop-down cache resources, judge the survival period of content voluntarily simultaneously, with minimum accessed for foundation at most recently, delete resource, vacate spatial cache;
Intelligent DNS module: intelligent DNS carries out active and standby deployment, the access request of user is resolved an edge that distance users is nearest, service ability is best by intelligent DNS and is accelerated cache node and user is asked be redirected to this edge to accelerate cache node, and finally provides service by this edge acceleration cache node.
Above-mentioned Centroid is stored by Content Management, content, contents distribution 3 functional modules form,
Content managing module is responsible for increasing content, delete, upgrade and the hot value of statistical content;
Content storage module determines the location mode of content, improves the response efficiency accelerating platform;
Contents distribution module carry out content proactive customizations distribution and Hot Contents passive drop-down.
In addition, present invention also offers the method for work of the full-service CDN system based on HTTP, it comprises the following steps:
1) before stream media information is issued, form unified flv file after carrying out encoding and decoding by Streaming Media processing module, afterwards flv file cut into slices and generate multiple little flv file and m3u8 index file;
2) Centroid obtains the little flv file after process and m3u8 index file from Streaming Media processing module, and is distributed to each edge acceleration cache node based on http protocol;
3) temperature of the accessed resource of edge caching nodes record, when hot value reaches the threshold value of setting, triggers resource pulls function, directly pull from source station can buffer memory web page element and be distributed to edge and accelerate cache node, ensure that the close of user's access within the scope of the instant row of node content and coverage; Edge caching nodes judges the survival period of content voluntarily simultaneously, with minimum accessed for foundation at most recently, delete resource, vacates spatial cache;
4) when there being user access request, the CDN territory of intelligent DNS by judging belonging to IP address, the nearest cache node of selected distance user sends to user as final service node, allows the object of user's Gains resources nearby to reach.
Beneficial effect of the present invention:
1, a set of CDN system is only needed just can to accelerate based on streaming media, webpage, the file transfer while of http protocol.
2, the Streaming Media processing module of system front end is positioned at, various types of Media Stream can be processed, unified for carrying out based on HTTP the Streaming Media section file distributed on CDN, section file is more conducive to distribution, and can support that client carries out streaming broadcasting based on http protocol.
3, intelligent DNS module can carry out overall scheduling based on node load state and Link State, reduces delay, the reduction backbone network data traffic that user accesses CDN node, ensure the object of CDN High Availabitity high stability to reach.
Accompanying drawing explanation
Fig. 1: based on the full-service CDN System's composition figure of HTTP,
Fig. 2: Streaming Media processing module workflow diagram,
Fig. 3: CDN system distributed resources figure,
Fig. 4: CDN subsystem pull-down resource map,
Fig. 5: CDN system initiatively deletes resource map,
Fig. 6: CDN system is passive deletion resource map as required,
Fig. 7: intelligent DNS workflow diagram.
Embodiment
CDN service system of the present invention accelerates cache node, intelligent DNS module composition primarily of Streaming Media processing module, Centroid, edge, sees shown in Fig. 1 dotted line frame.
(1) Streaming Media processing module
Different from general CDN system, in the present invention, traditional CDN system is carried out functions expanding, with the addition of Streaming Media processing module, see Fig. 2.This module is deployed in CDN system foremost, and adding Streaming Media processing module object is processed by various types of Media Stream, unified for carrying out based on HTTP the Streaming Media section file distributed on CDN.Like this, a set of Streaming Media CDN system just need not be developed separately, also can compatible polytype Media Stream.When traditional CDN carries out media file distribution, can provide service by after a whole media file disposable buffer memory to node, after the present invention forms unified flv file after carrying out encoding and decoding by Streaming Media processing module before distribution, it is cut into slices, section file is more conducive to distribution, and can support that client carries out streaming broadcasting based on http protocol.
(2) Centroid
Centroid is responsible for the storage of content, management and the whole network distribution, and the content that contents processing provider (i.e. source station) injects, be made up of Content Management, content storage, contents distribution 3 functional modules.Content managing module is responsible for increasing content, delete, upgrade and the hot value of statistical content.Content storage module determines the location mode of content, improves the response efficiency accelerating platform.Contents distribution module carry out content proactive customizations distribution and Hot Contents passive drop-down.
Content distribution policy is divided into customized push and focus to pull two kinds of modes.Customized push is completed by Centroid, can carry out in time/regularly single/multiple content is pushed to the whole network/specified node, see Fig. 3.
Focus pulls and is completed by each edge acceleration cache node, edge accelerates cache node and obtains content temperature by content managing module, when hot value reaches the threshold value of setting, triggers resource pulls function, content is directly pulled from source station, ensure that the close of user's access within the scope of the instant row of node content and coverage, see Fig. 4.
Content is removed strategy and is divided into initiatively removing and passive removing.Employing is initiatively removed function and the content of having distributed immediately is deleted, and ensures the reasonability that in net, content exists, sees Fig. 5.
Due to limited storage space, certain strategy is adopted automatically to carry out content removing so need to call passive removing function when reaching the cache residual space threshold value of setting by cache node, with ensure the high resource of new access temperature can successful buffer memory to node, see Fig. 6.
(3) edge accelerates cache node
Edge accelerates cache node and is used for content that buffer memory distribute from Centroid or oneself active content drop-down to source station, and provides service to user; Memory node possesses the storage capacity of magnanimity and the concurrent access ability of height, ensures the high reliability storing content.
Supported the tissue of cluster storage inside node by distributed file system technology, by eliminating centrostigma autgmentability bottleneck based on P2P peer-to-peer architecture, supporting the height expansion of whole content network and stretching flexibly
Adopt the high reliability of many copies, snapshot and data check technique guarantee data
Metadata Clustering is adopted to carry out classifying rationally and dynamic load leveling to the storage of magnanimity metadata
By content addressed technology, duplicate contents is filtered, by eliminating many parts of redundancies of same content source in operation layer dynamic code stream adaptation
Effectively space utilisation is promoted by eliminating data redundancy
(4) intelligent DNS module
Traditional CDN dispatching patcher realizes user's request to be redirected to the optimal node thought in advance by static configuration dns resolution, the shortcoming done like this be not consider this node dynamic load situation, arrive the link circuit condition of this node and the health status of buffer memory device.If in the dns resolution result that configured in advance is good, certain buffer memory device cisco unity malfunction, so has certain customers and is affected.Intelligent DNS is by opening access log function, and the IP address of collection user access, sees Fig. 7, and measuring system needs access log to resolve, and take out time and the User IP of user's access, then measurement user and edge accelerate the route distance of cache node.Meanwhile, the automatic Edge detected of measuring system accelerates cache node survival condition, and intelligent DNS can be made to accelerate according to edge the result that cache node survival condition determines the request of user domain name analysis.Intelligent DNS can be made like this can to carry out overall scheduling based on node load state and Link State, reduce to reach delay, the reduction backbone network data traffic that user accesses CDN node, ensure the object of CDN High Availabitity high stability.
Be that Nan Rui school, video education website carries out accelerating as example with the present invention.Before use the present invention, Nan Rui does not carry out in school any website and accelerates process, if adopt CDN technology ripe at present to accelerate, purchase two is so needed to overlap CDN system, a set of is the webpage CDN system accelerated web page element on website specially, a set of Streaming Media CDN system being the video be specifically designed in website and carrying out accelerating, and need source station to process to adapt to Streaming Media CDN system to video.In order to not carry out any transformation to source station, final Nan Rui school have employed the full-service CDN system based on HTTP of the present invention.The source station in Nan Rui school is positioned at Beijing, and we choose Beijing, node is accelerated as buffer memory in Shanghai, Tianjin.
First Streaming Media processing module is disposed in Beijing, receive the Media Stream being transferred to CDN from Nan Rui school, what Streaming Media processing module was real-time carries out encoding and decoding process to these streams transmitted, after synthesizing unified flv file, the section unit called in Streaming Media processing module is cut into slices to flv file and is generated multiple little flv file and m3u8 index file.
Dispose Centroid in Beijing, the file after Centroid obtains process from Streaming Media processing module, and be distributed to each acceleration cache node based on http protocol.In addition, Centroid directly obtain from source station all kinds of can the web page element of buffer memory, be distributed to acceleration cache node.
In Beijing, Tianjin, deployment edge, Shanghai accelerate cache node, for cache web pages element, can flv file after downloaded resources and Media Stream resume module and m3u8 index file.Edge caching nodes possesses the function of web server, can provide service directly to user.The temperature of the accessed resource of edge caching nodes record, so as from source station drop-down cache resources.Edge caching nodes judges the survival period of content voluntarily, with minimum accessed for foundation at most recently, delete resource, vacates spatial cache.
Respectively dispose an intelligent DNS in Beijing and Shanghai, Beijing intelligent DNS, as main DNS, carries out GSLB to power grid user.The nearest cache node of intelligent DNS selected distance user sends to user as final service node, allows the object of user's Gains resources nearby to reach.Shanghai intelligent DNS is as auxiliary DNS, and send keep-alive message every 10s to main DNS, the health status of the main DNS of real-time judge, the machine if main DNS delays, auxiliary DNS is the work of adapter GSLB immediately.
Embody rule approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention, should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvement, these improvement also should be considered as protection scope of the present invention.
Claims (3)
1., based on a full-service CDN system of HTTP, it is characterized in that comprising Streaming Media processing module, Centroid, edge acceleration cache node, intelligent DNS module, wherein:
Streaming Media processing module, this module is deployed in CDN system foremost, for receiving and various types of video source in process source station, the unified Streaming Media be treated as based on HTTP transmission, and cut into slices;
Centroid: connect Streaming Media processing module, source station and each edge and accelerate cache node, is responsible for the storage of content, management and the whole network distribution, and processes the content injected source station;
Edge accelerates cache node: i.e. buffer service module, disposes near user by region, the content of distribute from Centroid for buffer memory or oneself active content drop-down to source station, and provides service to user; The temperature of the accessed resource of edge caching nodes record, so as from source station drop-down cache resources, judge the survival period of content voluntarily simultaneously, with minimum accessed for foundation at most recently, delete resource, vacate spatial cache;
Intelligent DNS module: intelligent DNS carries out active and standby deployment, the access request of user is resolved an edge that distance users is nearest, service ability is best by intelligent DNS and is accelerated cache node and user is asked be redirected to this edge to accelerate cache node, and finally provides service by this edge acceleration cache node.
2. the full-service CDN system based on HTTP according to claim 1, is characterized in that, Centroid is stored by Content Management, content, contents distribution 3 functional modules form,
Content managing module is responsible for increasing content, delete, upgrade and the hot value of statistical content;
Content storage module determines the location mode of content, improves the response efficiency accelerating platform;
Contents distribution module carry out content proactive customizations distribution and Hot Contents passive drop-down.
3. described in claim 1 based on a method of work for the full-service CDN system of HTTP, it is characterized in that comprising the following steps:
1) before stream media information is issued, form unified flv file after carrying out encoding and decoding by Streaming Media processing module, afterwards flv file cut into slices and generate multiple little flv file and m3u8 index file;
2) Centroid obtains the little flv file after process and m3u8 index file from Streaming Media processing module, and is distributed to each edge acceleration cache node based on http protocol;
3) temperature of the accessed resource of edge caching nodes record, when hot value reaches the threshold value of setting, triggers resource pulls function, directly pull from source station can buffer memory web page element and be distributed to edge and accelerate cache node, ensure that the close of user's access within the scope of the instant row of node content and coverage; Edge caching nodes judges the survival period of content voluntarily simultaneously, with minimum accessed for foundation at most recently, delete resource, vacates spatial cache;
4) when there being user access request, user's request, by judging the CDN territory belonging to User IP, is redirected to nearest best edge cache node by intelligent DNS.
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