CN101005369A - Distritive content sending net and distributive content sending and up transfering method - Google Patents

Distritive content sending net and distributive content sending and up transfering method Download PDF

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Publication number
CN101005369A
CN101005369A CN 200610005378 CN200610005378A CN101005369A CN 101005369 A CN101005369 A CN 101005369A CN 200610005378 CN200610005378 CN 200610005378 CN 200610005378 A CN200610005378 A CN 200610005378A CN 101005369 A CN101005369 A CN 101005369A
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China
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es
file
user
step
server
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CN 200610005378
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Chinese (zh)
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杨春波
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深圳市瑞福特信息技术有限公司
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Publication of CN101005369A publication Critical patent/CN101005369A/en

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Abstract

The distributed content dispensation network (CDN) includes periphery server and management center. Each periphery server is a part of data storage. Union set of data of all periphery servers constitutes stored content of CDN. Periphery server also can provide data service. The management center includes at least a dispatch server in charging for directing user's request to optimal periphery server. The method includes steps: based on position of terminal user, and distribution condition of ES, RBS selects the ES nearest to user logically; terminal user puts forward play back request to the ES; if the requested file is in the ES, then the ES provides service for the user directly; if the ES does not have the file, then, the ES queries RBS which ES has the file, the ES introduces stream from that ES by using proxy mode, and forwards the file to the user. Features are: simple structure, low cost, and providing service nearby for SP/CP.

Description

A kind of distributed content distribution networks and distributed content distribution and the method for uploading

Technical field

The invention relates to a kind of content distributing network technology, particularly relates to a kind of content delivery network that has merged distributed storage and distributed distribution.

Background technology

Along with increasing rapidly with the user of Internet user constantly strengthens the demand that improves internet QoS, traditional provides end (ICP by internet content, Internet Content Provider) directly provide information service mode to be faced with serious challenge, the ICP application site generally is to set up physical site in one or a few place, orients towards the whole country and even the Global Internet user provides information service.Problems such as the self structure characteristics of the Internet and network bandwidth bottleneck make and postpone length when people visit Global Site that efficient is low.In order to solve the problems of the technologies described above, just adopted content distribution techniques, promptly by in existing Internet, increasing the network C DN (Content Delivery Network----content delivery network) of an application layer, with the content release of website near user's network " edge ", make the user can obtain required content nearby, solve Internet network congestion situation, improve the response speed of user capture.

Be illustrated in figure 1 as present a kind of CDN networking structure, its main building block has the GSLB device, central server (CS-Central Server) and Edge Server equipment such as (ES-Edge Server), its network architecture mainly can be divided into the center and peripheral two large divisions.Core is generally by the GSLB device, and equipment such as central server are formed, and the marginal portion generally is made up of numerous Edge Servers, as the edge device part that visit information is provided to the user.The information of ICP website is published on each Edge Server in advance by central server, and each user is dispatched by the GSLB device the access request of ICP website.From the networking structure of CDN shown in Figure 1 as can be seen, though the Edge Server of CDN is distributed in the edge of network, still concentrate on network center as the GSLB device of scheduler.In above-mentioned CDN network configuration, general user capture scheduling flow may further comprise the steps as shown in Figure 2:

Step 100, the user clicks the content in this website by browser access World Wide Web (WEB) website.

Step 101, the browse request local domain name server of user terminal (DNS, Domain Name Server) is resolved the domain name of this website.

Step 102, local dns is to the mandate DNS of this website request analysis.

Step 103, the mandate DNS notice local dns of this website, the mandate DNS of the subdomain name of this website domain name is the GSLB device, and returns the IP address of GSLB device.

Step 104, local dns sends analysis request to the GSLB device.

Step 105, the mandate DNS notice local dns of this website, the mandate DNS of the subdomain name of this website domain name is the GSLB device, and returns the IP address of GSLB device.

Step 106, local dns sends analysis request to the GSLB device.

Step 107, GSLB device generally are in the repeating query mode based on certain preset strategy, select the ES an of the best, and return the IP address of this ES to local dns.

Step 108, local dns are returned the IP address of above-mentioned ES to the browser of above-mentioned user terminal.

Step 109, the user visits above-mentioned ES according to the IP address of returning, and sends request to it.

Step 110, if the required content of this user not on this ES, then ES obtains the required content of user from central server, execution in step 109 again; Otherwise, direct execution in step 110.

Step 111, this ES provides its required content according to above-mentioned user's request.

Though adopt the CDN of such scheme to a certain degree improving user's visit quality, it is difficult to carry out large-scale CDN networking; In addition, owing to adopt the unified scheduling mode of concentrating, thus how wide no matter coverage has, all concentrate in together as the GSLB device of scheduler, cause the load of scheduler heavy, low-response, require also very high to the concurrent load capacity of scheduler.

In order to solve the defective that exists among the above-mentioned CDN, application number is that 03156104.6 Chinese patent has disclosed a kind of layered contents distribution networks structure, and content distributing layer and service layer that it comprises the content release layer, comprise at least one grade of distribution sublayer form; Described content release layer comprises at least one ICP operating side and at least one ICP, and every grade of distribution sublayer of described content distributing layer is by at least one media manager (MM), a central server (CS); Described edge service floor is made up of at least one edge service district; The content release layer required content distributed by with its one-level that directly links to each other distribution sublayer in distribution node be distributed to the edge service layer step by step downwards.Adopt such framework, because it has adopted the content distribution management of hierarchical layered formula, so can set up the network of various scales, the networking mode of CDN is more flexible, has realized the region equilibrium of business load simultaneously.But because each edge service layer all still is to come memory contents by central server (CS), its cost is higher; In addition, when the distribution of SP (service provider)/CP (content supplier) disperses or more for a long time, it is bigger to upload pressure,, can not also provide service nearby to SP/CP because each SP/CP will upload the data to CS.

Summary of the invention

The objective of the invention is to the technological deficiency that exists among the above-mentioned CDN, provide a kind of framework simple, cost is low, fully takes into account terminal use's dispersiveness and the dispersiveness of SP/CP, can satisfy can both provide service nearby to terminal use and SP/CP, has the CDN scheme of high QoS.

Technical scheme of the present invention is to realize like this, a kind of distributed content distribution networks, comprise some Edge Servers and administrative center, it is characterized in that: described each Edge Server is the part of storage, and the data union of all Edge Servers constitutes the memory contents of complete content delivery network; Described Edge Server also can provide data, services; At least comprise dispatch server in the described administrative center, be used for user's request is directed to the best edge server; Also draw together meaningful distribution management server, be used for management document to distribute, and the file consolidation index is provided; NM server is used for collecting the state of each fringe node, and loading condition provides the foundation of scheduling for dispatch server.

A kind of method of distributed content distribution networks distributing contents comprises the steps:

Step 301, the terminal use at first sends to RBS with the analysis request of DNS;

Step 302, RBS will select in logic from the nearest ES of user according to terminal use's position and the distribution situation of ES, be receiveed the response back by DNS in the address of ES and give the user;

Step 303, the terminal use will propose playing request to this ES;

Step 304, if requested file is arranged on the ES then directly provide service to the user, if there is not this file on this ES, then ES will inquire this file is arranged on which ES to RBS, upward stream is drawn to get off from that ES with agency's mode then, be transmitted to the user then;

Step 305, ES can download to this locality with this file when acting on behalf of frequency or number of times and reaching certain threshold values, have the user to ask this program to this ES after so, then can directly provide service.

A kind of distributed content distribution networks is uploaded the method for content, comprises the steps:

Step 401, at first SP proposes upload request to CDMS;

Step 402, the file that CDMS will upload is registered, and state is made as registered;

Step 403, CDMS inquires that to RBS which ES is best suited for that this SP uploads, the foundation that RBS calculates is the position of SP, the position of upload file size and ES, the size of memory space compares, find out the ES of optimum;

Step 404, CDMS returns to SP with the address of this ES, and SP will connect this ES, carry out file and upload;

Step 405, upload end after, ES will report to CDMS, CDMS is new record more, and the state of record is updated to and exists.CDMS will safeguard the distribution situation of file storage in the whole C DN network, and unified file index is provided;

Step 406, CDMS is according to redundant demand, and the distribution situation of user's request, as certain area more this file of user's program request is arranged, then CDMS does not have the suitable ES of this document to send instruction to one, orders its ES from existing this file to download this file.This process is exactly the adjustment that storage distributes.

Step 407, under the continuous adjustment of CDMS, file will be distributed on each ES of CDN according to the most rational situation.

Adopt the solution of the present invention,, saved carrying cost because the data distributed store on each Edge Server, does not have traditional central server.Owing to during each SP upload file, can select ES to upload nearby, and not need to upload to central server CS, the quality that SP is served improves so that SP also can obtain service nearby in institute in addition.

Description of drawings

Fig. 1 is the CDN configuration diagram of prior art scheme

Fig. 2 is a user capture scheduling flow schematic diagram in the prior art scheme one

Fig. 3 is the CDN configuration diagram of one embodiment of the invention

Embodiment

For more well-known expression purpose of the present invention, technical scheme and advantage, the present invention is further described in more detail below in conjunction with drawings and the specific embodiments.

Distributed C DN of the present invention, to there be central server (CS), media data with distributed store on each fringe node (ES), the granularity that distributes is unit with the file, generally speaking, media file of some only all on each fringe node (ES) will be complete CDN content but all ES go up the union of file. at conceptive ES ES-CS each other.Saved the carrying cost of CDN, and made the SP of distribution also can obtain nearby service, improved quality the SP service.

Be illustrated in figure 3 as a preferred embodiment of the present invention, a kind of Distributed C DN, it comprises Edge Server 100 (ES) or RS and administrative center 200, wherein administrative center 200 comprises NM server 201 (NMS-Network Manager Server), distribution of content management server 202 (CDMS-ContentDistributing Manager Server), dispatch server 203 (RBS-Resource Balance Server) and access management system 204 (AMS-Access Manager System).The big young pathbreaker of the area that described CDN zone covers is changeable according to actual loading ability and network condition, can be a city, also can be a province, or even a country.Do not have traditional central server among the described CDN, all contents all are storing among each ES10 of unit distribution with the file, and the union of content will constitute the complete memory contents of CDN among all ES10.When terminal use's (not obtaining among the figure) asks, RBS will be according to user's position, the difference of ISP network of living in, the position of node, the load condition of node, the content situation in the node, and information (these information are dynamically updated in administrative center's database (DB) by NMS and CDMS) such as node ISP network of living in, utilize intelligent dispatching algorithm that user's request is redirected to only ES10, provide concrete data, services by ES10.The quantity of ES10 can dynamic expansion, dynamically adds or removes wherein any ES10 according to user distribution and customer volume.So adopt this structure, make the CDN networking more flexible.And because its all content all is that distributed store is in each ES, and do not need central server CS, so saved carrying cost greatly, and during owing to each SP upload file, can select ES to upload nearby, and do not need to upload to central server CS, so that SP also can obtain service nearby, improve quality to the SP service.

In this CDN, the distribution situation of file, promptly certain file by the CDMS unified management, adopts optimum redundant storage scheme (as the strange land redundancy, different I SP net redundancy etc.) to guarantee the reliability of storage in which ES.CDMS also can dynamically adjust the distribution of file according to the accessed situation of data, as the never accessed mistake of certain file on certain ES, just can be under the situation that redundancy guarantees with this file deletion, if there is not certain file on certain ES, but having or have than the multi-user, this ES region within the jurisdiction asks this document, CDMS will send instructions and make this ES from somewhere this document being got this locality. and CDMS also can make data have a copy at least in different ISP networks according to the difference of ES ISP of living in addition.

Based on CDN network configuration shown in Figure 3, general content distribution flow may further comprise the steps:

Step 301, the terminal use at first sends to RBS with the analysis request of DNS;

Step 302, RBS will select in logic from the nearest ES of user according to terminal use's position and the distribution situation of ES, be receiveed the response back by DNS in the address of ES and give the user;

Step 303, the terminal use will propose playing request to this ES;

Step 304, if requested file is arranged on the ES then directly provide service to the user, if there is not this file on this ES, then ES will inquire this file is arranged on which ES to RBS, upward stream is drawn to get off from that ES with agency's mode then, be transmitted to the user then;

Step 305, ES can download to this locality with this file when acting on behalf of frequency or number of times and reaching certain threshold values, have the user to ask this program to this ES after so, then can directly provide service.

Based on CDN network configuration shown in Figure 3, general content uploading flow process may further comprise the steps:

Step 401, at first SP proposes upload request to CDMS;

Step 402, the file that CDMS will upload is registered, and state is made as registered;

Step 403, CDMS inquires that to RBS which ES is best suited for that this SP uploads, the foundation that RBS calculates is the position of SP, the position of upload file size and ES, the size of memory space compares, find out the ES of optimum;

Step 404, CDMS returns to SP with the address of this ES, and SP will connect this ES, carry out file and upload;

Step 405, upload end after, ES will report to CDMS, CDMS is new record more, and the state of record is updated to and exists.CDMS will safeguard the distribution situation of file storage in the whole C DN network, and unified file index is provided;

Step 406, CDMS is according to redundant demand, and the distribution situation of user's request, as certain area more this file of user's program request is arranged, then CDMS does not have the suitable ES of this document to send instruction to one, orders its ES from existing this file to download this file.This process is exactly the adjustment that storage distributes.

Step 407, under the continuous adjustment of CDMS, file will be distributed on each ES of CDN according to the most rational situation.

Claims (10)

1, a kind of distributed content distribution networks, comprise some Edge Servers (100) and administrative center (200), it is characterized in that: described each Edge Server (100) is the part of storage, and the data union of all Edge Servers (100) constitutes the memory contents of complete content delivery network; At least comprise a dispatch server (203) in the described administrative center (200), be responsible for user's request is directed to best edge server (100).
2, a kind of distributed content distribution networks as claimed in claim 1 is characterized in that, described Edge Server (100) also can provide data, services.
3, a kind of distributed content distribution networks as claimed in claim 1 is characterized in that, described administrative center (200) also comprises distribution of content management server (202), is used for management document to distribute, and the file consolidation index is provided.
4, a kind of distributed content distribution networks as claimed in claim 3, it is characterized in that, described administrative center (200) also comprises NM server (201) and access management system (204), described NM server (201), be used for collecting the state of each fringe node, loading condition provides the foundation of scheduling for dispatch server.
5, a kind of distributed content distribution networks as claimed in claim 1 is characterized in that, described Edge Server (100) is shared data mutually to each other.
6, a kind of method of distributed content distribution networks distributing contents is characterized in that, comprises the steps: step 301, and the terminal use at first sends to RBS with the analysis request of DNS;
Step 302, RBS will select in logic from the nearest ES of user according to terminal use's position and the distribution situation of ES, be receiveed the response back by DNS in the address of ES and give the user;
Step 303, the terminal use will propose playing request to this ES;
Step 304, if requested file is arranged on the ES then directly provide service to the user, if there is not this file on this ES, then ES will inquire this file is arranged on which ES to RBS, upward stream is drawn to get off from that ES with agency's mode then, be transmitted to the user then.
7, the method for a kind of distributed content distribution networks distributing contents as claimed in claim 5, it is characterized in that, also comprise: ES is when acting on behalf of frequency or number of times and reaching certain threshold values, this file can be downloaded to this locality, there is the user to ask this program so, then can directly provides going up of service rapid to this ES.
8, a kind of distributed content distribution networks is uploaded the method for content, it is characterized in that, comprises the steps:
Step 401, SP proposes upload request to CDMS;
Step 402, the file that CDMS will upload is registered, and state is made as registered;
Step 403, CDMS inquires that to RBS which ES is best suited for that this SP uploads, what RBS calculated comply with
According to the position that is SP, the position of upload file size and ES, the size of memory space compares, and finds out optimum ES;
Step 404, CDMS returns to SP with the address of this ES, and SP will connect this ES, carry out file and upload.
9, upload the method for content as distributed content distribution networks as described in the claim 7, it is characterized in that, also comprise: step 405, after the SP upload file finishes, ES will report to CDMS, and CDMS is new record more, the state of record is updated to exist.CDMS will safeguard the distribution situation of file storage in the whole C DN network, and unified file index is provided.
10, upload the method for content as distributed content distribution networks as described in the claim 8, it is characterized in that, also comprise: step 406, CDMS is according to redundant demand, and the distribution situation of user's request, carry out the adjustment that file storage distributes, file is distributed on each Edge Server according to the most rational situation.
CN 200610005378 2006-01-19 2006-01-19 Distritive content sending net and distributive content sending and up transfering method CN101005369A (en)

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