CN100534070C - Method and system for implementing application server load balancing - Google Patents
Method and system for implementing application server load balancing Download PDFInfo
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- CN100534070C CN100534070C CNB2007101461490A CN200710146149A CN100534070C CN 100534070 C CN100534070 C CN 100534070C CN B2007101461490 A CNB2007101461490 A CN B2007101461490A CN 200710146149 A CN200710146149 A CN 200710146149A CN 100534070 C CN100534070 C CN 100534070C
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Abstract
The invention discloses a method to realize application server, comprising the following steps: a domain name analyzing server receives a request with application server cluster domain name sent by a user, and assigns an application server with an IP address mark to the user from the pre-stored application server IP address list corresponding to the domain name; the application server assigned to the user locates an application server for the user according to the current load information of each application server in the application server cluster stored in a meta-data base server, and feedbacks the application server information to the user. The located server stores the file data uploaded by the user in the storage device at the network side during the communication with the user. The invention can realize direct P2P data transmission, balance distribution operations, and make full use of every application server resource in the application server cluster.
Description
Technical field
The present invention relates to the Network storage technology field, relate in particular to a kind of method and system that realize application server load balancing.
Background technology
Network disk (WebDisk) business is mainly used in file and uploads, downloads, and for better expandability, high availability are provided, the application server in the WebDisk system is disposed in the mode of trooping usually, to realize the load balancing of application server.But all there are some problems in more existing load technologies when handling the WebDisk business.
As Linux virtual server (LVS, Linux Virtual Server) IP virtual server (IPVS) software in, its three kinds of load-balancing techniques that adopt all can't solve fully uploads when downloading the loading problem of load balance scheduler (Load Balance Box).The LVS project provides a LVS framework of realizing Scalable Network Services, and as shown in Figure 1, in this LVS framework, load balance scheduler is responsible for job scheduling, makes the rear end real server load after the scheduling reach balanced; Real server is used under the scheduling of load balance scheduler, and request message that the reception user sends and feedback response message are finished the download of uploading of data to the user.In this LVS framework, the three kinds of method operation principles and the defective of IP load balancing are as follows:
1.Virtual?Server?via?Network?Address?Translation(VS/NAT)
By network address translation, the destination address of the request message that load balance scheduler rewriting user sends according to default dispatching algorithm, is tasked the request message branch real server of rear end; When the response message of real server passed through load balance scheduler, the source address of message was rewritten, and returns to the client again, finishes whole load dispatch process.
The shortcoming of this mode is no matter to upload or download, and data all must be through load balance scheduler, and it is a hotspot device in the system obviously, uploading in the download system of the such big data quantity of WebDisk, is easy to become performance bottleneck.
2.Virtual?Server?via?IP?Tunneling(VS/TUN)
When adopting the NAT technology, because the response message of request message that the user sends and real server feedback all must carry out address rewrite through load balance scheduler, when the user asks to get more and more, the disposal ability of load balance scheduler will become bottleneck like this.In order to address this problem, load balance scheduler is forwarded to real server to request message by IP tunnel (IP Tunneling), and real server directly returns to the user with response message, and load balance scheduler only needs processing request message like this.Because ordinary circumstance lower network service response is big more many than request message, so after adopting the VS/TUN technology, the maximum throughput of cluster system can improve 10 times.
The shortcoming of this mode is, though walked around load balance scheduler during data download, when uploading data, data still must be through load balance scheduler, and it still is a hotspot device in the system when uploading data, so still there is bottleneck problem.
3.Virtual?Server?via?Direct?Routing(VS/DR)
The VS/DR mode sends to real server by the MAC Address of the request message rewriting the user and send with request message, and real server directly returns to the user with the response message of feedback.The same with above-mentioned VS/TUN mode, the VS/DR technology can greatly improve the retractility of cluster system.This method does not have the expense of IP tunnel, and the real server in trooping do not have to support the requirement of IP tunneling protocol yet, but requires load balance scheduler and real server all to have a network interface card to be connected on the same physics network segment.
This mode is compared with IP Tunneling, though reduced the expense of IP tunnel, but still do not have to solve the bottleneck problem of hotspot device when uploading data.
Summary of the invention
The invention provides a kind of method and system that realize application server load balancing, in order to solve prior art in data upload or when downloading, load balance scheduler becomes the problem of transfer of data bottleneck easily.
The invention provides a kind of system that realizes application server load balancing, comprising:
The application server cluster that includes at least one application server;
The metadata database server stores the current load information of each application server in the described application server cluster;
Domain name resolution server, store the corresponding relation of described application server cluster domain name and this middle application server IP address of trooping, being used for when the user visits this application server cluster based on described application server cluster domain name, is the user distributes an IP address designation in application server cluster application server according to the described corresponding relation of storing;
Be assigned to user's application server in the application server cluster, according to the current load information of storing in the described metadata database server of each application server, for the user locatees an application server, and this Application Server information is fed back to the user;
Memory device is used for storing the user and the described application server that is positioned communicates the file data that process is uploaded.
The invention provides a kind of method that realizes application server load balancing, comprise step:
Domain name resolution server receives the request that carries application server cluster domain name that the user sends, and
Storage in advance with this domain name corresponding application server IP address list in distribute the application server of an IP address designation to give this user;
Be assigned to user's application server,,, and this Application Server information fed back to the user for this user locatees an application server according to the current load information of each application server in the application server cluster of storing in the metadata database server;
Described located server is communicating in the process with described user, and the document data saving that the user is uploaded is in the memory device of network side.
The present invention eliminates the bottleneck problem of this hotspot device of load balance scheduler, realizes direct, point-to-point transfer of data; Simultaneously can be according to the loading condition of each application server in the application server cluster, balanced distribution operation has made full use of the application server resource of each in the application server cluster.
Description of drawings
Fig. 1 is a Linux Virtual Server framework in the prior art;
Fig. 2 is WebDisk system global structure figure in the embodiment of the invention;
Fig. 3 is a WebDisk load balancing business process map in the embodiment of the invention.
Embodiment
Describe the present invention in detail below in conjunction with Figure of description.
As shown in Figure 2, the WebDisk system of the present invention's proposition comprises: application server cluster 201, domain name resolution server 202, metadata database server 203 and memory device 204.
Described application server cluster is big, a virtual server, form by many application servers, the user visits this by same domain name and troops, like this concerning the user, the quantity of application server is transparent, be that the user only feels that a virtual big server exists, and do not know specifically to have how many platform application servers.
Each application server is reported own current load condition according to certain strategy (as time interval strategy, load variations strategy etc.) in the application server cluster 201, and load state information is recorded in the metadata database server 203 of system.For example the load as if application server changes, and has surpassed certain load variations threshold values, just can report and upgrade the load state information of oneself; No matter whether the load of application server change took place, application server all will be reported the once load condition of oneself in the official hour interval; If surpass official hour at interval, application server is not reported the load condition of oneself yet, and the state that this application server will be looked by system is unavailable, just can be again to its distribution operation as the server of load balance scheduler.
The WebDisk system load balancing operation flow that the present invention proposes comprises the steps: as shown in Figure 3
Step 1, user initiate a request, carry the domain name of the application server cluster of user capture in the described request;
The domain name that step 2, domain name resolution server (DNS) provide according to the user, the mode of (RoundRobin) of crying with wheel is distributed an application server IP for it;
In this step, in DNS, store application server cluster domain name, and this of this domain name correspondence troop in each application server IP tabulation (be at least an application server IP, mostly be most all application server IP), these application servers that are registered will serve as load balance scheduler, be responsible for job scheduling; DNS with wheel mode the user side request is navigated on the application server of an IP address designation in the IP tabulation.For example, application server cluster domain name is webdisk.com.cn, and the application server IP address list during this domain name correspondence is trooped is IP1, IP2 and IP3, and these three application servers will serve as load balance scheduler; DNS with wheel mode user request is navigated to IP1, on the application server of an IP address designation among IP2 and the IP3.Every station server in trooping is an application server, can be again load balance scheduler.
Step 3, set up communicating to connect of user side and the above-mentioned application server that navigates to;
Step 4.1-4.2, this application server that navigates to obtain the load condition table of each up-to-date application server from metadata database, find out the lightest application server of present load;
Step 5, this application server that navigates to feed back to user side with the lightest Application Server information of load that finds;
Step 6, user side are repositioned onto operation on the lightest application server of this load, carry out transfer of data, and the document data saving that the user is uploaded is in the memory device 204 of network side.
Dotted line is a control information flow among Fig. 3, and this part information data amount is very little comparatively speaking; Solid line is an actual traffic data stream, just is meant in the WebDisk business and uploads the downloaded files data that data volume is very big.
Owing to eliminated the bottleneck problem of this hotspot device of load balance scheduler, direct, point-to-point transfer of data that the present invention has realized; While is according to the loading condition of each application server in the application server cluster, balanced distribution operation has made full use of each the application server resource in trooping, and has therefore simplified the WebDisk system, improve the data upload download efficiency, helped the realization of load balancing.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (8)
1, a kind of system that realizes application server load balancing is characterized in that, comprising:
The application server cluster that includes at least one application server;
The metadata database server stores the current load information of each application server in the described application server cluster;
Domain name resolution server, store the corresponding relation of described application server cluster domain name and this middle application server IP address of trooping, being used for when the user visits this application server cluster based on described application server cluster domain name, is the user distributes an IP address designation in application server cluster application server according to the described corresponding relation of storing;
Be assigned to user's application server in the application server cluster, according to the current load information of storing in the described metadata database server of each application server, for the user locatees an application server, and this Application Server information is fed back to the user;
Memory device is used for storing the user and the described application server that is positioned communicates the file data that process is uploaded.
2, the system as claimed in claim 1 is characterized in that, reports the metadata database server by the load information that self is current of each application server in the described application server cluster and stores.
3, system as claimed in claim 2 is characterized in that, described each application server regularly reports the metadata database server with the load information of self; Or
Each when the load information of self changes, self load information is reported the metadata database server.
4, the system as claimed in claim 1 is characterized in that, the domain name resolution server distributes an IP address designation in the wheel mode of crying in application server cluster application server is given the user.
5, the system as claimed in claim 1, it is characterized in that, the described application server that is assigned to the user is according to the current load information of storing in the metadata database server of each application server, for the user locatees the lightest application server of present load.
6, a kind of method that realizes application server load balancing is characterized in that, comprises step:
Domain name resolution server receives the request that carries application server cluster domain name that the user sends, and
Storage in advance with this domain name corresponding application server IP address list in distribute the application server of an IP address designation to give this user;
Be assigned to user's application server,,, and this Application Server information fed back to the user for this user locatees an application server according to the current load information of each application server in the application server cluster of storing in the metadata database server;
Described located server is communicating in the process with described user, and the document data saving that the user is uploaded is in the memory device of network side.
7, method as claimed in claim 6 is characterized in that, the described application server load information current according to each application server that is assigned to the user is for the user locatees the lightest application server of present load.
8, method as claimed in claim 6 is characterized in that, the domain name resolution server is mode with wheel, storage in advance with this domain name corresponding application server IP address list in distribute the application server of an IP address designation to this user.
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