CN102904828A - Load balancing method and device - Google Patents
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- CN102904828A CN102904828A CN2012104183017A CN201210418301A CN102904828A CN 102904828 A CN102904828 A CN 102904828A CN 2012104183017 A CN2012104183017 A CN 2012104183017A CN 201210418301 A CN201210418301 A CN 201210418301A CN 102904828 A CN102904828 A CN 102904828A
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Abstract
The invention provides a load balancing method and a load balancing device. The method comprises the following steps of: A, determining whether a message belongs to the head message of new session or not, if so, turning to C, otherwise, turning to B; B, dispatching the message according to a corresponding relation between session characteristics in a dispatching record chart and outlet links or dispatching the new session according to session dispatching rules; and C, judging whether the head message of the new session belongs to preset user application or not according to preset application identification rules, if not, turning to the B, otherwise, judging whether the new session is new application head session or not; if so, dispatching the new session according to application dispatching rules, otherwise, determining an outlet link according to user application identifications in the dispatching record chart. By dispatching on a level higher than the session, a plurality of session of specific user application (such as Peer to Peer) preferably concerned by an administrator can be dispatched to a high-quality link, so that user experience is ensured.
Description
Technical field
The present invention relates to network technology, relate in particular to a kind of balancing link load device and management server.
Background technology
The balancing link load technology is a kind of network flow management technology that is based upon on the multilink network configuration.So-called multilink refers in order to ensure unbroken access to the Internet, be generally the website and prepare a plurality of Internet access link, and these links usually belongs to different operator (ISP).
Multi-link load balance is investigated the network traffics on the different links, the factors such as length of communication quality and access path, and the employed link of turnover flow that access is produced is dispatched and is selected.Can expand to greatest extent and utilize the bandwidth of link like this, and guarantee that as far as possible the user accesses the experience of the Internet.And when a certain link occurs fault interrupted, can be automatically with the assignment of traffic of access to other still on the link that works, avoided the Single Point of Faliure on the ISP link.
Existing multi-link load balance function mainly is when surpassing max-thresholds for flow in the link, to adopt Stochastic Equilibrium algorithm or weighting scheduling algorithm, with unnecessary assignment of traffic to the less high-quality link of other bandwidth pressure.And application link health examination technology breaks down or health status when bad at the link of current access, handovers the connection on the good link of other chain environments.Current this equalization scheme is based on every stream that newly connects (also can be understood as session), during scheduling current whole piece stream is dispatched on other the high-quality link, ensure like this smooth and easy of network connection and utilize fully link bandwidth, improve link utilization.
Existing this balancing link load strategy is based on stream that certain bar sets up, more and more can not meet the demands when processing large traffic service balanced.Especially now the large traffic service of public network may need to watch online HD video programme televised live such as the user.During such user uses, the user may set up simultaneously a large amount of stream and realize data transfer, present load-balancing technique is a kind of method of salary distribution at random substantially, in the multilink situation not simultaneously, may be fitted on a plurality of flow points of same application on the relatively poor link of same network condition, be difficult to guarantee user's experience and transmission speed.
Summary of the invention
In view of this, the invention provides a kind of load balancing apparatus, be applied on the load-balancing device of user network outlet, wherein this load-balancing device comprises one or more outbounds; This device comprises: the Dialog processing unit, and conversation dispatching unit and application schedules unit, wherein:
The Dialog processing unit is used for extracting the session characteristics of this service message when service message enters load-balancing device, and determines according to the dispatching record table whether this service message belongs to the literary composition of reporting for the first time of new session; If it is turn the application schedules cell processing, otherwise change of team words scheduling unit is processed;
The conversation dispatching unit, be used for according to the session characteristics of dispatching record table and the corresponding relation of outbound the service message in the session that has existed being dispatched, perhaps be used for the corresponding relation that the default conversation dispatching rule of basis is dispatched to corresponding outbound with new session and upgrades dispatching record table session characteristics and outbound;
The application schedules unit, whether the literary composition of reporting for the first time of declaring this new session according to default application identification rule for identification belongs to default user's application, if otherwise the processing of change of team words scheduling unit, if further judge according to default dispatching record table whether according to this new session be the first session that newly-built user uses; If, then according to the application schedules rule this new session is dispatched on the corresponding outbound, and upgrade the corresponding relation of user's application identities in the dispatching record table and this new session and outbound, if otherwise determine corresponding outbound according to dispatching record table user application identities, and this new session is dispatched on the outbound corresponding with this user's application identities, and upgrade the corresponding relation of session characteristics and outbound in the dispatching record table.
The present invention also provides a kind of load-balancing method, is applied on the load-balancing device of user network outlet, and wherein this load-balancing device comprises one or more outbounds; The method may further comprise the steps:
Steps A, when service message enters load-balancing device, extract the session characteristics of this service message, and determine according to the dispatching record table whether this service message belongs to the literary composition of reporting for the first time of new session; If it is step C processes, and processes otherwise turn step B;
Step B, according to the corresponding relation of the session characteristics in the dispatching record table and outbound the service message in the session that has existed is dispatched, perhaps according to default conversation dispatching rule new session is dispatched to corresponding outbound and upgrades the corresponding relation of session characteristics and outbound in the dispatching record table;
Whether the literary composition of reporting for the first time that step C, the default application identification rule of basis are declared this new session belongs to default user's application, if process otherwise turn step B, if further judge according to default dispatching record table whether according to this new session be the first session that newly-built user uses; If, then according to the application schedules rule this new session is dispatched on the corresponding outbound, and upgrade the corresponding relation of user's application identities in the dispatching record table and this new session and outbound, if otherwise determine corresponding outbound according to user's application identities in the dispatching record table, and this new session is dispatched on the outbound corresponding with this user's application identities, and upgrade the corresponding relation of session characteristics and outbound in the dispatching record table.
From the open communication model, the present invention dispatches by aspect higher more than session, and a plurality of continuous dispatching under same user can being used are to same outbound.When the keeper wishes to give priority to user's application-specific, such as P2P is when using, and the keeper can remove a plurality of conversation dispatchings that a user uses by the scheduling mode of application layer of the present invention to the high-quality link, guaranteed the experience that the user uses P2P to use.
Description of drawings
Fig. 1 is the networking schematic diagram of load balancing in a kind of prior art.
Fig. 2 is the building-block of logic of load balancing apparatus in one embodiment of the present invention.
Embodiment
The user may need to use the such technology of P2P to obtain programme content in watching the live process of HD video, can significantly alleviate like this processing pressure of source server.A large amount of P2P flow limiting technologies is arranged in the prior art, mainly is in order to prevent based on the download of the P2P impact on the normal web page access of other users.Yet in some application scenarios, P2P may become the higher application of priority level; Such as use P2P to watch live such application of video frequency program.Cancel simply the experience that can not guarantee the user to the flow restriction of P2P this moment; The user experiences and traditional QoS mechanism also can't obtain preferably.
The present invention sets about improving the experience of user in the P2P application from the load-balancing device (LB) of network egress.Be embodied as example with computer program, the invention provides a kind of load balancing apparatus, it is applied on the LB, and wherein this LB comprises many outbounds, and this device comprises Dialog processing unit, conversation dispatching unit, application schedules unit and business configuration unit.This device is carried out following steps when LB moves:
Step 101, the application identification that business configuration unit reception user issues is regular, conversation dispatching is regular, application schedules is regular and switch command;
Step 102 when the switch command of receiving when the business configuration unit is open command, enables described application schedules unit; When the switch command of receiving is out code, close described application schedules unit;
Step 103, when service message entered LB from the LB internal network, the Dialog processing unit extracted the session characteristics of this message, and determined according to the dispatching record table whether this service message belongs to new session; If it is turn step 104, otherwise turn step 105;
Step 104, the conversation dispatching unit is dispatched to corresponding outbound with the corresponding relation of outbound with this service message according to session characteristics in the dispatching record table;
Step 105, the identification of application schedules unit judges according to default application identification feature whether the literary composition of reporting for the first time of this new session belongs to default user and use, if turn step 106, otherwise turns step 109;
Step 106, application schedules unit further according to the application identification rule judgment according to the whether newly-built user first session of using of this new session, if so, turn step 107, otherwise turn step 108;
Step 107, the application schedules unit is dispatched this new session on the corresponding outbound according to the application schedules rule, and upgrades the dispatching record table, wherein further comprises the corresponding relation of user's application identities and outbound in the dispatching record table;
Step 108, corresponding outbound is determined according to user's application identities in the application schedules unit, and this new session is dispatched on the outbound corresponding with this user's application identities, and upgrades the corresponding relation of session characteristics and outbound in the dispatching record table;
Step 109 is dispatched to new session on the corresponding outbound according to default conversation dispatching rule, and upgrades the dispatching record table.
Below provide more detailed enforcement to describe.Suppose that described user is applied as P2P and uses, when the user watches video frequency program (live online such as primary events) by the P2P client, its may be under this be used newly-built a plurality of TPC or UDP session carry out data transfer; These sessions all belong to identical user uses, and also can be understood as more senior session.
Please refer to table 1, after user's service message enters LB, the Dialog processing unit extracts first the session characteristics (such as tlv triple or the five-tuple of message) of service message, search the dispatching record table, if the dispatching record table can't hit, explanation is that this service message is the literary composition of reporting for the first time of new session, is the professional message of follow-up newspaper that has had session if hit bright.For the session that has existed, the conversation dispatching unit can be according to the corresponding relation of session characteristics and outbound in the dispatching record table, with the current business dispatching message to the outbound of correspondence.
| User's application identities | Session characteristics | The outbound sign |
| a | M | 1 |
| a | N | 1 |
| ...... | ...... | ...... |
| x | O | 1 |
| x | P | 3 |
| ...... | ...... | ...... |
| y | Q | 3 |
| y | R | 3 |
Table 1
In the prior art, for a new session, the conversation dispatching unit can be dispatched to (as step 109) on the outbound with session according to default conversation dispatching rule, so follow-up all service messages of this session all can continue to be scheduled on this outbound, until this conversation end.Just be equivalent to that switch command is out code in the step 102, the pent situation in application schedules unit is the same, and correspondingly step 105 has not just existed to step 108.That is to say that the present invention can be according to the compatible existing scheduling method of user's needs.
When the application schedules unit was enabled, for a new session, it need to change step 105 over to and process.At first judge that by the application identification rule this new session is the default application that the keeper is concerned about in step 105, dispatch according to conversational mode if not just jumping to 109.If it is need to continue.Can preset the identification that one or more application identification rules are used for P2P among the present invention.Identify such as the use side slogan: have some P2P clients can use the stiff end slogan, and most of user can't change this port numbers, therefore can go out according to port identification the flow of a lot of P2P; Consider that the port numbers that some P2P uses is dynamic, in another kind of mode, can also identify first the P2P protocol massages, therefrom obtain the port numbers of dynamic change, and then carry out the identification of service traffics based on port numbers.In addition, can also identify according to the P2P characteristics, such as the P2P client can be set up the TCP connection at short notice in a large number, find the client of setting up the P2P connection thereby carry out statistical analysis according to these characteristics, and then definite characteristic of correspondence, such as port numbers etc.In the mode prior art of P2P application identification a large amount of introductions are arranged, the present invention is not limited to specific RM.Need to prove: aforementioned applications recognition rule, conversation dispatching rule, application schedules is regular also can be the parameter that has write computer program in the development process, might not be that the keeper issues.
Really belong to user's application that the keeper is concerned about if identify new session, need to see that whether belonging to the user who has existed uses this moment, illustrating if it is that the user uses exists, new session should be dispatched to this user and use on the corresponding outbound, can guarantee that like this a user all sessions under using can be scheduled on the same outbound as much as possible.The bandwidth of outbound need to prove, owing to may reach the upper limit of scheduling.Please refer to the example of table 1, suppose that the newly-built session P that the user uses under the x should be dispatched on the link 1, but because the bandwidth of link 1 has reached the upper limit, need this moment to select other links to dispatch, such as the highest link of priority except link 1, such as link 3.
If new session is a first session that newly-built user uses, that is to say does not have corresponding user's application identities in the dispatching record table.Need to be dispatched to this new session on the corresponding outbound this moment according to default application schedules rule.The application schedules rule can have a lot of variations, is applied as example with P2P, such as the keeper can set the P2P application schedules to the highest link of current priority; Perhaps the keeper can specify P2P is used on fixed schedule to an outbound, can also be P2P is used random schedule to two links of appointment.After first session is scheduled for an outbound, being equivalent to this New Consumers application has been scheduled on this outbound, the subsequent session that this user uses can step 108 by continuous dispatching to this outbound, unless the bandwidth of this outbound reaches the predetermined upper limit.
From the open communication model, the present invention dispatches by aspect higher more than session, and a plurality of continuous dispatching under same user can being used are to same outbound.When the keeper wishes to give priority to user's application-specific, such as P2P is when using, the keeper can remove a plurality of conversation dispatchings that a user uses by the scheduling mode of application layer of the present invention to the high-quality link, guaranteed the experience that the user uses P2P to use, when the user need to pass through the P2P watching video live broadcast, effect was very obvious.And the present invention can also support closing of application schedules, and after live past period of primary events, the keeper can close application schedules, turns back to traditional mode, other businesss of networking of protection user.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a load balancing apparatus is applied on the load-balancing device of user network outlet, and wherein this load-balancing device comprises one or more outbounds; This device comprises: the Dialog processing unit, and conversation dispatching unit and application schedules unit is characterized in that:
The Dialog processing unit is used for extracting the session characteristics of this service message when service message enters load-balancing device, and determines according to the dispatching record table whether this service message belongs to the literary composition of reporting for the first time of new session; If it is turn the application schedules cell processing, otherwise change of team words scheduling unit is processed;
The conversation dispatching unit, be used for according to the session characteristics of dispatching record table and the corresponding relation of outbound the service message in the session that has existed being dispatched, perhaps be used for the corresponding relation that the default conversation dispatching rule of basis is dispatched to corresponding outbound with new session and upgrades dispatching record table session characteristics and outbound;
The application schedules unit, whether the literary composition of reporting for the first time of declaring this new session according to default application identification rule for identification belongs to default user's application, if otherwise the processing of change of team words scheduling unit, if further judge according to default dispatching record table whether according to this new session be the first session that newly-built user uses; If, then according to the application schedules rule this new session is dispatched on the corresponding outbound, and upgrade the corresponding relation of user's application identities in the dispatching record table and this new session and outbound, if otherwise determine corresponding outbound according to dispatching record table user application identities, and this new session is dispatched on the outbound corresponding with this user's application identities, and upgrade the corresponding relation of session characteristics and outbound in the dispatching record table.
2. device as claimed in claim 1 is characterized in that, described user is applied as P2P and uses.
3. device as claimed in claim 1 is characterized in that, described application schedules rule comprises: session is dispatched to the highest outbound of priority.
4. device as claimed in claim 3 is characterized in that, the application schedules rule further comprises: prescribe a time limit when the outbound that is dispatched to has reached on the bandwidth, session is dispatched on the highest outbound of other outbound medium priorities.
5. device as claimed in claim 1, it is characterized in that, also comprise: the business configuration unit is used for the switch command that receiving management person issues, when the switch command of wherein receiving when the business configuration unit is open command, the described application schedules of business configuration cell enable unit; When the switch command of receiving was out code, described application schedules unit was closed in the business configuration unit.
6. a load-balancing method is applied on the load-balancing device of user network outlet, and wherein this load-balancing device comprises one or more outbounds; It is characterized in that the method may further comprise the steps:
Steps A, when service message enters load-balancing device, extract the session characteristics of this service message, and determine according to the dispatching record table whether this service message belongs to the literary composition of reporting for the first time of new session; If it is step C processes, and processes otherwise turn step B;
Step B, according to the corresponding relation of the session characteristics in the dispatching record table and outbound the service message in the session that has existed is dispatched, perhaps according to default conversation dispatching rule new session is dispatched to corresponding outbound and upgrades the corresponding relation of session characteristics and outbound in the dispatching record table;
Whether the literary composition of reporting for the first time that step C, the default application identification rule of basis are declared this new session belongs to default user's application, if process otherwise turn step B, if further judge according to default dispatching record table whether according to this new session be the first session that newly-built user uses; If, then according to the application schedules rule this new session is dispatched on the corresponding outbound, and upgrade the corresponding relation of user's application identities in the dispatching record table and this new session and outbound, if otherwise determine corresponding outbound according to user's application identities in the dispatching record table, and this new session is dispatched on the outbound corresponding with this user's application identities, and upgrade the corresponding relation of session characteristics and outbound in the dispatching record table.
7. method as claimed in claim 6 is characterized in that, described user is applied as P2P and uses.
8. method as claimed in claim 6 is characterized in that, described application schedules rule comprises: session is dispatched to the highest outbound of priority.
9. method as claimed in claim 8 is characterized in that, the application schedules rule further comprises: prescribe a time limit when the outbound that is dispatched to has reached on the bandwidth, session is dispatched on the highest outbound of other outbound medium priorities.
10. method as claimed in claim 6 is characterized in that, also comprises:
The switch command that step D, receiving management person issue, and when the switch command of receiving is open command, enable the processing of described step C; When the switch command of receiving is out code, close the processing of described step C.
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Address after: Binjiang District and Hangzhou city in Zhejiang Province Road 310051 No. 68 in the 6 storey building Patentee after: Hangzhou Dipu Polytron Technologies Inc Address before: Binjiang District and Hangzhou city in Zhejiang Province Road 310051 No. 68 in the 6 storey building Patentee before: Hangzhou Dipu Technology Co., Ltd. |