CN101849384A - Method for controlling load balance of network system, client, server and network system - Google Patents
Method for controlling load balance of network system, client, server and network system Download PDFInfo
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- CN101849384A CN101849384A CN200780101436.8A CN200780101436A CN101849384A CN 101849384 A CN101849384 A CN 101849384A CN 200780101436 A CN200780101436 A CN 200780101436A CN 101849384 A CN101849384 A CN 101849384A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1004—Server selection for load balancing
- H04L67/1008—Server selection for load balancing based on parameters of servers, e.g. available memory or workload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1004—Server selection for load balancing
- H04L67/1023—Server selection for load balancing based on a hash applied to IP addresses or costs
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
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Abstract
A method for controlling load balance in a network system, a client, a server, and a network system is provided. The method for controlling load balance in a network system that comprises a client cluster and a server cluster comprises the steps of: detecting a load condition of at least one server of the server cluster to determine a corresponding load level; transmitting a multicast message including the load level to the client cluster by multicast at the server; and determining a server to which a service request is to be sent at a client of the client cluster based on the multicast message. The load balance can therefore be performed at a client without dedicated load balance equipment, thus decreasing the risk of single point invalidation and simplifying the framework of the network system.
Description
Technical field
The present invention relates to the network communications technology, more specifically, relate to a kind of method and client computer, server and network system that is used for the Control Network system load balancing.
Background technology
Along with development of internet technology, number of users sharply increases, and comes to provide the task of enormous quantity and service to satisfy user's demand to a large amount of client computer by using server cluster.And adopt load-balancing technique between computer network, can will handle and communication activity is assigned to server in the server cluster equably, thereby the bandwidth of expansion servers, its throughput that increases, improve speed of response of server, improve server and other efficiency of resource, for the user provides better visit quality.
Fig. 1 is the theory diagram of existing SiteServer LBS.As shown in Figure 1, existing SiteServer LBS comprises the client computer cluster of being made up of a plurality of client computer 100,101 etc. 10, such as the load-balancing device 40 of load equalizer and the server cluster of being made up of a plurality of servers 200,201 etc. 20, load-balancing device 40 is connected with server cluster 20.The service request that client computer 100 from client computer cluster 10 sends is by delivering to load-balancing device 40 such as the Local Area Network of for example Ethernet and WLAN or Virtual Local Area Network and such as the network 30 of the wide area network of for example internet, load-balancing device 40 is according to specific allocation algorithm, for example polling method, WRR method, minimum linking number method, the fastest linking number method and address Hash method etc. are selected server from server cluster 20; Load-balancing device 40 sends to client computer with the IP address and the port information of selected server 201, thereby server 201 is set up the service request that is connected to come processing client with client computer 100.
But when service request quantity is brought up to a certain degree, on single load-balancing device, just bottleneck effect may occur, and the specialized apparatus balancing equipment makes the framework of existing network system become complicated, cause network operation to need higher cost.
Summary of the invention
Therefore, the invention provides a kind of method, client computer, server and network system that is used for the Control Network system load balancing, to solve bottleneck effect and the simplied system structure that exists in the prior art at the problems referred to above.
According to an aspect of the present invention, a kind of method that is used for the Control Network system load balancing is provided, this system comprises client computer cluster and server cluster, and described method comprises: its load condition detects to determine its grade of load at least one the server place in described server cluster; To comprise that by multicast the multicast message of the grade of load sends to described client computer cluster; And select server to send service request according to the client computer place of described multicast message in described client computer cluster.
According to a further aspect in the invention, a kind of client computer is provided, be configured to from a plurality of server receiving multicast messages, described client computer comprises: choice device, be used for selecting server to send service request according to described multicast message, wherein said multicast message comprises corresponding server load class information.
According to a further aspect in the invention, provide a kind of server, be configured to send multicast message to the multicast group of client computer cluster, described server comprises: checkout gear is used to detect the load condition of described server to determine its grade of load; And multicast apparatus, the multicast message that is used for comprising the grade of load sends to described client computer cluster.
According to a further aspect in the invention, provide a kind of network system, comprised above-mentioned server and above-mentioned client computer.
According to a further aspect in the invention, a kind of computer program is provided, comprise computer executable instructions, when carrying out described instruction on computer equipment, this instruction causes described equipment to be configured to carry out according to any method in the claim 1 to 11.
Favourable modification is in addition limited by dependent claims.
Description of drawings
In conjunction with the accompanying drawings, purpose of the present invention, characteristics and advantage will be apparent from following detailed description to embodiments of the invention, wherein:
Fig. 1 is the theory diagram of existing load balancing network system;
Fig. 2 shows the theory diagram of load balancing network system according to an embodiment of the invention;
Fig. 3 shows the flow chart of Control Network system load balancing method according to an embodiment of the invention;
Fig. 4 shows the schematic diagram of channel map according to an embodiment of the invention;
Fig. 5 shows the flow chart of the load-balancing method of server according to other embodiments of the present invention;
Fig. 6 shows the flow chart of the load-balancing method of client computer according to other embodiments of the present invention;
Fig. 7 shows the renewal load server table to be selected of client computer according to other embodiments of the present invention or the flow chart of channel map;
Fig. 8 shows the theory diagram of server according to other embodiments of the present invention; And
Fig. 9 shows the theory diagram of client computer according to other embodiments of the present invention.
Embodiment
Below, embodiments of the present invention is described in detail in conjunction with the accompanying drawings.
According to embodiments of the invention, when a large amount of service requests occurring, can use new processing to come the load balancing of Control Network system, basic thought is: utilize multicasting technology that the client computer of load condition in the client computer cluster of at least one server in the server cluster carried out multicast, select server in the server cluster at the client computer place by specific selection algorithm, thus the risk of having disperseed single node.
Fig. 2 shows the theory diagram of the load balancing network system of embodiments of the invention.As shown in Figure 2, SiteServer LBS comprises the client computer cluster of being made up of a plurality of client computer 100,101 and 102 etc. 10, and the server cluster of being made up of a plurality of servers 200,201 and 202 etc. 20.Client computer cluster 10 is a multicast group, and multicast ip address can be Add1, and server cluster 20 is another multicast group, and multicast ip address can be Add2.Network 30 can be Ethernet, can certainly support the local area network (LAN) or the wide area network of multicast for other.Client computer 100 in the client computer cluster 10 sends to according to special algorithm service request selected such as the server in the server cluster 20 of server 201 by the network 30 such as Ethernet.
Fig. 3 is the balanced flow chart of the control load of the embodiment of the invention.As shown in Figure 3, at step S301, server 201 detects the load condition of oneself, for example according to the value of CPU, memory and bandwidth, and the tolerable response time of system wait and be planned to the different grades of load, such as light level, intermediate, senior, extremely senior, congested or fault.Type for All hosts (the comprising client-server) grade of load is known, but each server have its oneself about determining the standard of the grade of load.For example, the CPU/ memory usage of server 200 definition 95% is " extremely senior "; Thereby server 201 is shared and is used for other service and defines 50% CPU/ memory usage and be " extremely senior "; Thereby server 202 has relatively poor performance and defines 80% CPU/ memory usage and be " extremely senior ".
After this at step S302, server 201 will comprise that the multicast message of its grade of load sends in client computer cluster 10 multicast group that IP multicast address is Add1, in an embodiment of the present invention, client computer does not need to know the particular characteristic of server, only needs to learn from the multicast message from server the grade of load of this server.Certainly, can also comprise the particular community of this server in the multicast message, perhaps the time of timer.For specific application, can customize the information of specific server, for example timer time, server property, the grade of load and load criteria for classification etc., thus make load balancing have flexibility.More specifically, the attribute that client computer can be by the respective server that obtains from multicast message and the server that will not have this attribute when keeping load server table to be selected exclude.For example, server 200 can control codec G.726 but other server can not, so this attribute will be presented in multicast message.Can be to the additional initial labels of server property, this is used by client computer.If initial labels remains unchanged, client computer can suppose that server property is constant so, thereby client computer can be ignored server property and handles and save the CPU time.For example, false code is as follows:
<Server>
<IP>135.252.134.99</IP>
<Load>1</Load>//Moderate?Load
<Name>ws01</Name>
<Attribute?Tag=“abc343532”>
<codec>g.726,g.711</codec>
…
</Attribute>
</server>
At last, at step S303, the client computer 100 in the client computer cluster 10 receives multicast message, when new service request occurring in request queue, selects suitable servers to send service request.Can wait according to traditional polling method, WRR method, minimum linking number method, the fastest linking number method and address Hash method and select server.Certainly can also keep a load server table to be selected at the client computer place, as shown in table 1, this tabulation can comprise next and this server mappings in the grade of load, attribute or the IP address of server correspondence to be selected.
Server number | The grade of load | The IP address | Server property |
??200 | Extremely high load | ??192.168.1.100 | ??ALL |
??201 | Underload | ??192.168.1.101 | ??IUA|M2UA|M3UA |
??202 | Medium load | ??192.168.1.102 | ??SIP |
??… | ??… | ??… | ??… |
Table 1 load server table to be selected
Interchangeable, this load server table to be selected also can be a channel map, as shown in Figure 4, each channel Mapping can receive the server in the server cluster of service request in channel map, its comprised from multicast message, obtain such as destination servers such as the grade of load, server property, IP addresses for information about.Client computer is selected server just to become and is selected corresponding channel in this case, and particularly, if select certain channel to send service request, then this request will send to the IP address of destination server.The grade of load and preferred server property lighter in channel selection procedure will have higher priority.
It will be apparent to those skilled in the art that in an embodiment of the present invention the one or more servers in the server cluster all can detect its grade of load and send multicast message, its operation principle is similar to the above.
Below how the server in the detailed description server cluster 20 is detected load condition.
Fig. 5 is the flow chart according to the load-balancing method of the server of the embodiment of the invention.As shown in Figure 5, server can periodically detect its load condition, also can be based on detecting its load condition or detect load condition in conjunction with both such as orders such as requests.At step S507, server checks whether timer time expires; When expiration then at step S508, detect load condition with definite grade of load according to its own standard; Next at step S509, will be to relevant informations such as its grade of load of client computer multicast that belongs to same multicast group and server propertys; At step S510, timer is resetted, so that the beginning next cycle.
With reference to Fig. 5, server also can be worked as and notified client computer when load condition changes.Step S501 begins this process; At step S502, server is waited for the service request from client computer; When arriving, service request begins to handle this request at step S503; Next detect load condition and determine the grade of load according to its load criteria at step S504 server; At step S505, whether server detects the present load grade and changes, if change (step S505: be), still continue to handle this service request at step S506, notify the All Clients that belongs to same multicast group but carry out multicast simultaneously, its new grade of load (step S509) of informing them; (step S505: not), then continue to handle service request at step S506, at step S511, this process finishes if the present load grade does not change.Server is taked first responsibility system in this processing request process, no matter promptly how this server load state changes, when client computer has sent service request, just on this server, handle, even other server load is lighter, before this server process is finished, can forward to yet and handle this service request on other server.Like this, service response can not shifted responsibility onto others between different server, has guaranteed carrying out smoothly of service request.
In this process, can introduce " industry "/" laziness " (eager upgrade/lazy downgrade) mechanism, promptly, load condition make load increase the weight of that (for example the grade of load is higher or congested etc. from gentlier becoming when changing, be also referred to as the load upgrading in this article) time, server in the server cluster 20 is this load upgrading message of multicast as far as possible rapidly, so that the overload status information of this server etc. can in time arrive client computer; Only (for example the grade of load of server is from higher middle rank or the light level etc. of becoming in that load reduction takes place, be also referred to as load degradation in this article) after a period of time at the server place of server cluster just this load degradation message of multicast notify client computer its load reduction, the recovery of any load grade all can stop the multicast of load degradation message in this period.Overflow by adopting this mechanism to stop, prevent the too fast variation under critical condition of server load state, thus the burden of reduction system and network.
Fig. 6 shows the flow chart of the load-balancing method of the client computer of additional embodiments according to the present invention.As shown in Figure 6, in step S602 inspection formation, there is new service request.
When new service request occurring, can select suitable servers or channel such as specific algorithms such as polling methods based on load server table to be selected or channel map basis in step S603 client computer, this principle can not repeat them here with reference to top part.
And load server table to be selected or channel map are regular updates or upgrade based on the variation of the parameter of relevant servers such as load condition.As shown in Figure 7, at step S701, the client computer in the client computer cluster is monitored multicast message in client computer multicast IP address; Receive this message and obtain the up-to-date information about the parameter of server such as load condition at step S702; Next at step S703 according to the parameter informations such as server load grade that received, upgrade load server table to be selected or channel map, for example increasing new server entry, the existing server entry of deletion or upgrade existing server entry, then is to insert new channel, delete existing channel or existing channel is carried out the renewal of information for channel map.
At last, send service request in step S604 client computer to selected server.
Under same inventive concept, Fig. 8 shows the theory diagram of the server of Control Network system load balancing according to an embodiment of the invention.Below in conjunction with accompanying drawing, describe present embodiment in detail.
As shown in Figure 8, the server 200 of the control system load balancing in server cluster 20 comprises: checkout gear 820 is used to detect the load condition of described server to determine its grade of load; And multicast apparatus 821, the multicast message that is used for comprising the grade of load sends to described client computer cluster.
The checkout gear 820 of the server of the Control Network system load balancing of present embodiment and can be by such as very lagre scale integrated circuit (VLSIC) or gate array, realize such as the semiconductor of logic chip, transistor etc. or such as the hardware circuit of the programmable hardware device of field programmable gate array, programmable logic device etc. at multicast apparatus 821, also can use the software of carrying out by various types of processors to realize, also can realize by the combination of above-mentioned hardware circuit and software.The server of the Control Network system load balancing of present embodiment is realized the method in server place Control Network system load balancing of embodiment shown in Figure 5 in operation.
Fig. 9 is the theory diagram of client computer according to other embodiments of the present invention.As shown in Figure 9, the client computer 100 in the client computer cluster 10 of present embodiment comprises choice device 910, is used for selecting server to send service request according to multicast message.
The choice device 910 of client computer 100 can wait according to traditional polling method, WRR method, minimum linking number method, the fastest linking number method and address Hash method and select server.Choice device 910 can also be selected which server is service request sent to reference to load server table to be selected or channel map that holdout device 911 is provided.
Holdout device 911 can be kept the channel map that the election server correspondence is treated in a load server table to be selected or load according to the information such as relevant servers such as the grade of load, server propertys in the multicast message that receives.Holdout device can be configured to by this tabulation or channel map are upgraded in the following operation of load server table to be selected or channel map:
● increase and insert new server option (channel);
● delete existing server option (channel);
● upgrade existing server option (channel).
The choice device 910 of the client computer of the Control Network system load balancing of present embodiment and holdout device 911 can be by such as very lagre scale integrated circuit (VLSIC) or gate array, realize such as the semiconductor of logic chip, transistor etc. or such as the hardware circuit of the programmable hardware device of field programmable gate array, programmable logic device etc., also can use the software of carrying out by various types of processors to realize, also can realize by the combination of above-mentioned hardware circuit and software.The client computer of the Control Network system load balancing of present embodiment realizes the method in client computer place Control Network system load balancing of embodiment shown in Figure 6 in operation.
The method of Control Network system load balancing in an embodiment of the present invention can be realized that perhaps the software of being carried out by various types of processors is realized by the computer executable instructions that moves on computer equipment.
In an embodiment of the present invention, because each client computer of client computer cluster 10 can realize that the distribution services request is to selected server, reach the network system load balancing, do not need the third party to act on behalf of the distribution of the service of being responsible for, therefore simplified the structure of network system, the risk of having disperseed single point failure, and server just detects its load condition in this structure, be not used for realizing load balancing, thereby simplified its structure.
In addition, owing to adopt multicasting technology, in server cluster, increasing during running time or the deletion server becomes and is easy to.When server will be increased in the server cluster, only need to add the server multicast group, and send its information to client computer multicast group IP address.When server need stop, it can be suitable sent information to client computer multicast group IP address.When if server exception stops, the failure that client computer can be by periodic test set broadcast message or send service request and obtain its state to the failure of server by detecting.Accordingly, client computer can be upgraded load server table to be selected or channel map is deleted this server.
In the network system of embodiments of the invention,, can be easy to monitor whole system by transmiting a request to client computer or server multicast ip address to arrive each main frame in the territory.
Further, in the network system of embodiments of the invention, owing to the employing multicast and based on there not being third-party framework, can define special-purpose server property and help test particular server in server cluster, just can guide all flows to specific server and need not to close all the other servers, thereby simplify the maintenance and management of network system.
Though below in conjunction with specific embodiments method, client computer, server and the network system of Control Network system load balancing of the present invention are described in detail, but the present invention is not limited to this, and those of ordinary skills can understand and can carry out multiple conversion, substitutions and modifications and without departing from the spirit and scope of the present invention to the present invention; Protection scope of the present invention is limited by claims.
Claims (25)
1. method that is used for the Control Network system load balancing, described system comprises client computer cluster and server cluster, described method comprises:
Load condition is detected at least one server place in described server cluster, to determine the grade of load of described server;
To comprise that by multicast the multicast message of the described grade of load sends to described client computer cluster; And
Select server to send service request according to the client computer place of described multicast message in described client computer cluster.
2. according to the method for the described load balancing of claim 1, the wherein said grade of load comprises light level, intermediate, senior, extremely senior, congested or fault.
3. according to the method for claim 1 or 2 described load balancing, wherein said multicast message also comprises server property and/or the timer time that is used to broadcast.
4. according to the method for each the described load balancing in the claim 1 to 3, the step of wherein said detection load condition comprises at least one of them: the load condition that periodically detects the load condition of described server and detect described server according to service request.
5. according to the method for the described load balancing of claim 3, wherein said selection server comprises with the step that sends service request:
Select server according to the grade of load in the described multicast message and/or server property.
6. according to the method for the described load balancing of claim 1, wherein said method also comprises:
Keep load server table to be selected at the client computer place.
7. according to the method for the described load balancing of claim 6, wherein said selection server comprises with the step that sends service request:
Select server by described load server table to be selected.
8. according to the method for the described load balancing of claim 6, the wherein said step of keeping load server table to be selected comprises:
Upgrade described load server table to be selected at the client computer place according to the multicast message that is received.
9. the method for described load balancing according to Claim 8, the step of wherein said renewal load server table to be selected comprises:
Increase new server entry, the existing server entry of deletion or upgrade existing server entry.
10. according to the method for each described load balancing in the claim 6 to 9, wherein said load server table to be selected comprises channel map.
11. according to the method for each the described load balancing in the claim 6 to 9, the step of wherein said transmission multicast message comprises one of them at least: when load taking place increase the weight of, send described multicast message immediately and only just send described multicast message in the server place at described server cluster after a period of time at the generation load reduction at the server place of described server cluster.
12. a client computer is configured to from a plurality of server receiving multicast messages, described client computer comprises:
Choice device is used for selecting server to send service request according to described multicast message, and wherein said multicast message comprises corresponding server load class information.
13. client computer according to claim 12, wherein said multicast message are also carried server property and/or are used for the timer time of multicast.
14. client computer according to claim 12, wherein said client computer also comprises:
Holdout device is used to keep load server table to be selected.
15. client computer according to claim 14, wherein said choice device are configured to select server by described load server table to be selected.
16. client computer according to claim 14, wherein said holdout device are configured to upgrade described load server table to be selected according to the multicast message that is received.
17. client computer according to claim 16, wherein said holdout device are configured to by increasing new server entry, the existing server entry of deletion or upgrading existing server entry and upgrade load server table to be selected.
18. according to each described client computer in the claim 14 to 17, wherein said load server table to be selected comprises channel map.
19. a server is configured to send multicast message to the multicast group of client computer cluster, described server comprises:
Checkout gear is used to detect the load condition of described server to determine its grade of load; And
Multicast apparatus, the multicast message that is used for comprising the described grade of load sends to described client computer cluster.
20. server according to claim 19, the wherein said grade of load comprise light level, intermediate, senior, extremely senior, congested or fault.
21. according to claim 19 or 20 described servers, wherein said multicast message also comprises server property and is used for the timer time of multicast.
22. according to claim 19 or 20 described servers, wherein said checkout gear is configured to detect at least one of them: periodically and detect the load condition of described server according to service request.
23. according to claim 19 or 20 described servers, wherein said multicast apparatus is configured to carry out at least one of them: when taking place to send described multicast message when load increases the weight of immediately and only just send described multicast message after a period of time at the generation load reduction.
24. a network system comprises according to each described client computer in the claim 12 to 18 with according to each described server in the claim 19 to 23.
25. a computer program comprises computer executable instructions, when carrying out described instruction on computer equipment, this instruction causes described equipment to be configured to carry out according to any method in the claim 1 to 11.
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