CN102624565A - Method for processing single-point failure in application layer multicast system - Google Patents
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Abstract
The invention provides a method for processing a single-point failure in an application layer multicast system. The method comprises the following step of: in the application layer multicast system, automatically selecting a next edge server in a sequencing result as a relay edge server if a relay scheduling server acquires a single-point failure of a relay edge server in an edge server group, and the like. According to the method for processing the single-point failure in the application layer multicast system, provided by the embodiment of the invention, the application layer multicast system is ensured to be applied in bearing high-definition, real-time and large-scale video living broadcast service, simultaneously, service interruption caused by a single-point failure of equipment in a system EPS (Emergency Power Supply) group is avoided, service delay brought by the single-point failure is reduced, and service quality is improved.
Description
Technical field
The present invention relates to the application layer multicast technology, relate in particular to the processing method of Single Point of Faliure in a kind of application layer multicast system, belong to communication technical field.
Background technology
Stream media technology is a kind of with the stream transmission mode technology of multi-medium data such as audio plays, video on the internet, and this technology makes the user can watch program while downloading, and does not watch after need whole file not having be downloaded again.The develop rapidly of the network bandwidth is that the Streaming Media application provides solid network foundation, and wherein, net cast is one of emphasis of Streaming Media application.Carry the professional system of net cast at present on the Internet and mainly contain client/server (Client/Serves; Abbreviate as: C/S) pattern, content distributing network (Content Delivery Network; Abbreviate as: CDN) pattern and peer-to-peer network (Peer to Peer; Abbreviate as: P2P) pattern.But above-mentioned network all is not suitable for carrying high definition, real-time, extensive net cast business.For carrying high definition, real-time, extensive net cast business, a kind of application layer multicast technology appears in prior art.Application layer multicast is through duplicating in application layer and data cached bag, rather than duplicate packet is avoided the deployment issue of network layer multicast (being the IP multicast) on router.Node in the application layer multicast net is the multicast member main frame, the route of stream medium data, duplicate, function such as forwarding all accomplished by the multicast member main frame, an overlay network is set up and safeguarded to the multicast member main frame based on self-organized algorithm.Application layer multicast has been inherited the communication efficiency of multicast pattern, has overcome the shortcoming that IP layer multicast is difficult in the Internet, carry out.
The application layer multicast technology relatively is fit to carry high definition, real-time, extensive net cast is professional; EPS based among the Edge Server crowd (EPS server zone) in the technological network system of being set up of application layer multicast is a visual plant; If Single Point of Faliure occurring, it will cause the professional interruption of total system; Even if system can automatically recover but also will bring the defective of traffic delay, therefore should reduce and the harmful effect that the tables of equipment point failure is caused occurs.The method that solves the tables of equipment point failure in the prior art comprises the mode that adopts distributed treatment, for example P2P DHT; Also comprise the hot machine backup mode that generally adopts.But owing to all have instability in above-mentioned two kinds of processing modes and postpone defectives such as big; Therefore how to avoid in the network system of utilizing the application layer multicast technology to be set up, causing professional interruption because of the tables of equipment point failure; And how to reduce traffic delay that brings because of Single Point of Faliure in the network system etc., progressively become the industry problem demanding prompt solution.
Summary of the invention
To the problems of the prior art, the present invention provides the processing method of Single Point of Faliure in a kind of application layer multicast system, does not interrupt with business behind the tables of equipment point failure in the guarantee network system, reduces to postpone.
The processing method of Single Point of Faliure in the application layer multicast system provided by the invention; Be applicable to following application layer multicast system; This application layer multicast system comprises core sub and edge subnet, and said core sub comprises interconnective content management server and group scheduling server; Said edge subnet comprises at least one Edge Server crowd, and said content management server is connected with said Edge Server crowd respectively with said group scheduling server; Each said Edge Server crowd comprises relaying dispatch server and at least one Edge Server; Said relaying dispatch server is connected with each said Edge Server; Be used for all said Edge Servers of said Edge Server crowd being sorted according to the Grade numbers and the load characteristic of each said Edge Server; Ranking results is offered each said Edge Server, and select the one edge server zone as the relaying Edge Server in order according to said ranking results; Said relaying Edge Server is used to receive the data that said content management server issues, and according to said ranking results said data is sent to said Edge Servers all among the said Edge Server crowd successively;
Described processing method comprises: if said relaying dispatch server is known the said relaying Edge Server Single Point of Faliure among the said Edge Server crowd, the Edge Server of then selecting next cis-position in the said ranking results automatically is as said relaying Edge Server; And the rest may be inferred.
The processing method of Single Point of Faliure in the application layer multicast system provided by the invention; When guaranteeing that application layer multicast system is suitable for carrying high definition, real-time, extensive net cast business; Ensure and do not cause service disconnection because of tables of equipment point failure in the EPS group of system; And reduce Single Point of Faliure and the traffic delay that brings, improve quality of service.
Description of drawings
Fig. 1 is the structural representation of application layer multicast system one embodiment of the present invention;
Fig. 2 is the structural representation of another embodiment of application layer multicast system of the present invention;
Fig. 3 is the flow chart of processing method one embodiment of the present invention.
Embodiment
The embodiment of the invention is for carrying high definition, real-time, extensive net cast business; A kind of network system of utilizing the application layer multicast technology to be set up is provided; And provide a kind of guarantee not because of the tables of equipment point failure causes service disconnection, and the processing method that reduces the traffic delay that brings because of Single Point of Faliure in the network system based on this network system.Below introduce the network system of utilizing the application layer multicast technology to be set up at present.
Fig. 1 is the structural representation of application layer multicast system one embodiment of the present invention; Fig. 2 is the structural representation of another embodiment of application layer multicast system of the present invention; What Fig. 2 represented is the composition sketch map of (also can be called EPS group) of Edge Server crowd among Fig. 1; As depicted in figs. 1 and 2, the system that present embodiment provides comprises: core sub 10, edge subnet 20 and access subnet 30.Wherein, core sub 10 comprises: content management server (CMS) 101, group scheduling server 102 and streaming server 103, and content management server 101 is connected with group scheduling server 102, and streaming server 103 is connected with content management server 101; Edge subnet 20 comprises at least one Edge Server crowd 201 (among the figure be example with 3).
Wherein, group scheduling server 102 is connected with each Edge Server crowd 201, is used for according to each Edge Server crowd's 201 load characteristic edge server zone 201 being dispatched, and scheduling result is offered content management server 101.Content management server 101 is connected with each Edge Server crowd 201, is used for to each Edge Server crowd 201 streaming media resource being provided according to scheduling result.Streaming server 103 is used for video information is edited, and generates streaming media resource, and offers content management server 101.
Insert subnet 30 and comprise at least one user 302.User 302 can be connected with Edge Server crowd 201, and promptly directly the relaying Edge Server 202 in Edge Server crowd 201 sends the data flow request.
Usually, in application layer multicast system, can arrange a plurality of Edge Server crowds, and a plurality of Edge Server crowds are arranged into different geographical respectively, so that the user inserts and obtain streaming media resource.On content management server 101, store the corresponding streaming media resource of a large amount of various video traffics, the professional corresponding streaming media resource of different video is different.Because the coverage of different edges server zone 201 and access number of users are different, the load characteristic of promptly different edges server zone 201 is different.Group scheduling server 102 confirms to distribute to each Edge Server crowd's 201 streaming media resource according to each Edge Server crowd's 201 load characteristic, promptly Streaming Media is dispatched, so that the Edge Server crowd's 201 of the whole network load balancing.The allocation result that content management server 101 is confirmed according to group scheduling server 102 provides the streaming media resource that adapts with it to each Edge Server crowd 201.For example: the Edge Server crowd 201 stronger for load capacity will be assigned with more streaming media resource; And will be assigned with less streaming media resource for the more weak Edge Server crowd 201 of load capacity; In addition, group scheduling server 102 can also confirm to distribute to each Edge Server crowd's 201 video traffic kind.
After Edge Server crowd 201 receptions and the stored stream media resource, just can receive the request of user's data stream, provide and the corresponding stream medium data of data flow request to the user.Wherein, for net cast was professional, Edge Server crowd 201 mainly was temporary streaming media resource; Rather than long-time storage, for example a bit of time memory after live end stores up this streaming media resource, after this short time finishes; Streaming media resource is abandoned, with conserve storage.In addition, the application layer multicast system of present embodiment also can be used for carrying other video traffics, VOD service for example, and then as far as VOD service, Edge Server crowd 201 is the stored stream media resource for a long time, so that the user carries out program request at any time.
Each Edge Server crowd 201 as shown in Figure 2 comprises: relaying dispatch server (RSS) 202 and at least one Edge Server (EPS) 203.Wherein, relaying dispatch server 202 is connected with each Edge Server 203, is used for Edge Server 203 is managed.Concrete, each Edge Server 203 is configured a Grade numbers, and on relaying dispatch server 202, also stores the Grade numbers of each Edge Server 203.This grade numbering is used to distinguish different Edge Server 203 on the one hand, is convenient to 202 pairs of Edge Servers 203 of relaying dispatch server on the other hand and manages.Wherein, each Edge Server 203 also can be reported its load characteristic to relaying dispatch server 202.Relaying dispatch server 202 sorts to all Edge Servers 203 according to the Grade numbers and the load characteristic of each Edge Server 203, and this ranking results (for example being combined into the multicast group chained list in order according to grade) is offered each Edge Server 203.In addition, relaying dispatch server 202 also can carry out processing such as data sync, load balancing to each Edge Server 203 according to the information such as load characteristic of each Edge Server 203 that gathers.Group scheduling server 102 specifically with each Edge Server crowd 201 in relaying dispatch server 202 be connected; Be used for obtaining the load characteristic of each Edge Server 203, and this Edge Server crowd 201 dispatched according to the load characteristic of each Edge Server 203 from relaying dispatch server 202.
Wherein, Content management server 101 specifically with each Edge Server crowd 201 in the relaying Edge Server be connected; Be used for streaming media resource being offered the relaying Edge Server, streaming media resource is offered each Edge Server 203 among the Edge Server crowd through the relaying Edge Server according to scheduling result.Wherein, the relaying Edge Server is the Edge Server that is in first cis-position in the ranking results.Concrete, group scheduling server 102 can be known the information of relaying Edge Server and can announce to content management server 101 through relaying dispatch server 202; Wherein, Because the relaying Edge Server is dynamic change; So understanding according to the variation of relaying Edge Server, content management server 101 dynamically connects with the relaying Edge Server; Then, content management server 101 sends to the relaying Edge Server among each Edge Server crowd 201 with streaming media resource, is distributed in the server zone 201 on the edge of by the relaying Edge Server.This content management server 101 is set up with the relaying Edge Server and dynamically is connected the interface quantity that can practice thrift content management server 101 with the mode that streaming media resource is provided to Edge Server crowd 201, is a kind of preferred implementation.Only show the signal that content management server is connected with relaying Edge Server in the one edge server zone among Fig. 2; But in fact content management server be with this Edge Server crowd in each Edge Server all be connected, specifically can realize through switch or router.
Wherein, in each Edge Server crowd 201, specifically receive the request of user's data stream, and the stream medium data corresponding with the data flow request is provided to the user by Edge Server 203.
Further; In the present embodiment; The load characteristic of Edge Server 203 changes among each Edge Server crowd 201; Therefore, relaying dispatch server 202 can be reported the information of coming up according to Edge Server 203 each Edge Server 203 is carried out dynamic order, and ranking results is offered each Edge Server 203.Wherein, the Edge Server 203 that in ranking results, is in first cis-position is the relaying Edge Server.This relaying Edge Server is responsible for received content management server 101 and is sent to the streaming media resource among its place Edge Server crowd 201, and the streaming media resource that receives is distributed to other Edge Servers 203 among its place Edge Server crowd 201.
Wherein, Relaying edge service implement body at first is distributed to streaming media resource according to ranking results and is in deputy Edge Server 203 in the ranking results; Be transmitted to and be in tertiary Edge Server 203 in the ranking results by being in deputy Edge Server 203 in the ranking results then; Transmit successively, till all Edge Servers 203 all receive streaming media resource in this Edge Server crowd 201.
Based on above-mentioned, the application layer multicast system that present embodiment provides provides service to the user, and promptly request provides the process of stream medium data specific as follows to the user according to user's data stream:
The user selects at a distance of nearest Edge Server crowd 201; And send connection requests to the Edge Server crowd's 201 who selects relaying dispatch server 202; In the present embodiment promptly, relaying dispatch server 202 also has the connection request that receives the user, the function that connects with the user.It is not that the user directly is connected with the relaying dispatch server that described relaying dispatch server has the ability that receives user's request, but the user can for example radius or aaa server etc. send to the relaying dispatch server with connection request through other servers.Particularly; The user can send connection request to the relaying dispatch server among its Edge Server crowd 201 that ask or nearest 202; Distribute the Edge Server 203 of access by this relaying dispatch server 202 for the user, simultaneously the information such as load in this Edge Server crowd 201 are reported to the whole network dispatch server (being the group scheduling server 102 in the core net) so that the overall scheduling of the group scheduling server of the whole network.
Relaying dispatch server 202 is confirmed as the Edge Server 203 that the user provides service according to user's connection request from least one Edge Server 203 of this Edge Server crowd 201, be designated as first Edge Server.Relaying dispatch server 202 can be according to the load characteristic of all Edge Servers 203 among the Edge Server crowd 201 of its place; Select the lighter Edge Server 203 of load as first Edge Server, and the address information of first Edge Server is returned to the user.
Then, the user sends the data flow request to first Edge Server, carries the relevant information of the video traffic that the user asks to play in this data flow request, for example video name etc.First Edge Server receives the request of user's data stream, to the user stream medium data corresponding with the data flow request is provided.
Wherein, For first Edge Server or for the Edge Server crowd 201 at its place; Possibly there be the stream medium data corresponding, also possibly do not have the stream medium data corresponding, therefore with the data flow request with the data flow request; When first Edge Server receives the data flow request, judge whether the stream medium data that exists the data flow request corresponding earlier; If judged result is for being that promptly it stores the stream medium data corresponding with the data flow request, then directly this stream medium data is sent to the user; If judged result is that then first Edge Server does not send request message to the relaying Edge Server, so that this stream medium data of relaying Edge Server request.After the relaying Edge Server received request message, to content management server or send request, content management server offered the relaying Edge Server with stream medium data.Afterwards, the relaying Edge Server offers other Edge Servers (comprising first Edge Server) with this stream medium data.This dynamic chain building mode combines the advantage of tree and circulus, promptly avoids the influence of Single Point of Faliure to dividing into groups, and can reach apparatus interconnection again and save network traffics.
When first Edge Server receives this stream medium data, this stream medium data is sent to the user.Wherein, The relaying Edge Server provides other Edge Servers 203 specifically can be according to ranking results this stream medium data; Stream medium data is sent to the Edge Server 203 that is in second cis-position in the ranking results; The Edge Server 203 that is in second cis-position in the ranking results is transmitted to the Edge Server 203 that is in the 3rd cis-position in the ranking results, transmits successively, so that stream medium data is sent to each Edge Server 203 among the Edge Server crowd 201 successively.
By above-mentioned visible; The application layer multicast system of present embodiment through the Edge Server crowd is set between content management server and user, is dispatched the edge server zone by the group scheduling server; And distribute streaming media resource for the Edge Server crowd according to scheduling result by content management server; So that the user obtains required stream medium data through inserting the Edge Server crowd, and when stream medium data does not exist, directly, content management server offers the user after obtaining and obtaining by the Edge Server crowd; Improved the real-time that the user obtains stream medium data; When having satisfied user's order video live broadcast service, the net cast business is beneficial to the professional development of net cast to the requirement of real-time.
The embodiment of the invention provides a kind of processing method of Single Point of Faliure based on above-mentioned application layer multicast system; This method comprises if relaying dispatch server 202 is known relaying Edge Server Single Point of Faliure among the Edge Server crowd 201 that for example load is transfinited or fault etc.; Then the relaying dispatch server 202 automatic EPS that select next cis-position (i.e. second cis-position) in the ranking results are as the relaying Edge Server, and promptly relaying dispatch server 202 is responsible for relaying distribution with the EPS that is positioned at second cis-position in the multicast group chained list as " inferior relaying EPS " temporarily; And the rest may be inferred.If time relaying full load or fault, then relaying dispatch server 202 will be selected the next EPS in the multicast group chained list automatically.After relaying dispatch server 202 is reselected the relaying Edge Server; Send a notification message to group scheduling server 102; And give content management server 101 by group scheduling server 102 notice, be responsible for sending media data flow by content management server 101 to the relaying Edge Server of reselecting.Wherein, The relaying dispatch server can be known the Edge Server fault in the following manner; Comprise specifically whether can detect Edge Server through the mode of heartbeat detection between relaying dispatch server and the Edge Server breaks down; If do not receive answer after receiving the information updating of Edge Server or the certain number of times of detection information that dispatch server initiatively sends in the certain hour, can think this Edge Server fault.
Can comprise a backup relays dispatch server among each Edge Server crowd in the above-mentioned application layer multicast system, as the backup of relaying dispatch server.Accordingly, said method also comprises, if for example transfinite or fault etc. by load for relaying dispatch server Single Point of Faliure, then the another one relaying dispatch server by " heat is equipped with " is that the backup relays dispatch server replenishes.Further; If Single Point of Faliure also appears in the backup relays dispatch server; Then among this Edge Server crowd all EPS will with synchrodata last before the RSS fault (in each EPS equipment all journal the multicast group chained list in the group synthetic before the RSS fault) determined " relaying EPS ", " inferior relaying EPS " ... order be as the criterion, transmit the streaming media resource that content management server 101 issues successively.At this moment, because RSS fault so EPS only can provide the streaming media resource of self storing for the user who is linked on it.。
Fig. 3 is the flow chart of processing method one embodiment of the present invention, and as shown in Figure 3, this flow process comprises the steps:
Step 1, user insert to Edge Server crowd's relaying dispatch server request EPS;
Step 2, relaying dispatch server distribute the lighter EPS of load for the user, and the information such as load in this Edge Server crowd are reported the group scheduling server to the whole network;
Step 3, user successfully insert EPS, and initiate the media data flow request to this EPS (being connected with user's EPS in like Fig. 2);
After step 4, EPS received user request, it went up EPS (like the inferior relaying EPS among Fig. 2) the transmission data flow request of a cis-position in the multicast group chained list;
Step 5, if request time relaying EPS failure, it goes up EPS (like the relaying EPS among Fig. 2) initiation request of a cis-position again in the multicast group chained list by this EPS of the scheduling of the RSS in the group;
Step 6, if the EPS visit in the multicast group chained list all failure be the equal Single Point of Faliure of EPS of cis-position on all in the multicast group chained list; Then with this EPS (being the EPS that is connected with the user among Fig. 2) as relaying EPS, through the RSS in this Edge Server crowd to content management server (CMS) request media data flow;
Step 7, content management server (CMS) are to this EPS distributing media data stream;
Step 8, EPS watch the program success to user's distributing media data stream.
The processing method of Single Point of Faliure in the application layer multicast system that the embodiment of the invention provides; When guaranteeing that application layer multicast system is suitable for carrying high definition, real-time, extensive net cast business; Ensure and do not cause service disconnection because of tables of equipment point failure in the EPS group of system; And reduce Single Point of Faliure and the traffic delay that brings, improve quality of service.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each method embodiment can be accomplished through the relevant hardware of program command.Aforesaid program can be stored in the computer read/write memory medium.This program the step that comprises above-mentioned each method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
What should explain at last is: above each embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although the present invention has been carried out detailed explanation with reference to aforementioned each embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, perhaps to wherein part or all technical characteristic are equal to replacement; And these are revised or replacement, do not make the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (5)
1. the processing method of Single Point of Faliure in the application layer multicast system is characterized in that said application layer multicast system comprises core sub and edge subnet, and said core sub comprises interconnective content management server and group scheduling server; Said edge subnet comprises at least one Edge Server crowd, and said content management server is connected with said Edge Server crowd respectively with said group scheduling server; Each said Edge Server crowd comprises relaying dispatch server and at least one Edge Server; Said relaying dispatch server is connected with each said Edge Server; Be used for all said Edge Servers of said Edge Server crowd being sorted according to the Grade numbers and the load characteristic of each said Edge Server; Ranking results is offered each said Edge Server, and select the one edge server zone as the relaying Edge Server in order according to said ranking results; Said relaying Edge Server is used to receive the data that said content management server issues, and according to said ranking results said data is sent to said Edge Servers all among the said Edge Server crowd successively;
Said processing method is applicable to the above-mentioned said layer multi-cast system of using; The treating method comprises: if said relaying dispatch server is known the said relaying Edge Server Single Point of Faliure among the said Edge Server crowd, the Edge Server of then selecting next cis-position in the said ranking results automatically is as said relaying Edge Server; And the rest may be inferred.
2. processing method according to claim 1 is characterized in that, also comprises a backup relays dispatch server among the said Edge Server crowd; Accordingly, said processing method also comprises:
If said relaying dispatch server Single Point of Faliure then carries out work with said backup relays dispatch server as the relaying dispatch server automatically.
3. processing method according to claim 2 is characterized in that, said processing method also comprises:
If said backup relays dispatch server Single Point of Faliure, among the then said Edge Server crowd all said Edge Server according to the determined said relaying Edge Server of said ranking results as the relaying Edge Server.
4. according to claim 1 or 2 or 3 described processing methods, it is characterized in that said processing method also comprises:
After one edge server among the said Edge Server crowd receives the data flow request of user's transmission; The Edge Server of a last cis-position sends the data flow request in said ranking results; If know the Edge Server Single Point of Faliure of a said last cis-position, the transmission data flow request of then in said ranking results, going up the Edge Server of a cis-position again; And the rest may be inferred.
5. processing method according to claim 4 is characterized in that, said processing method also comprises:
Go up the equal Single Point of Faliure of Edge Server of cis-position if know in the said ranking results all, then through said relaying dispatch server to the request of said content management server transmission data flow.
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