KR20000017857A - Web contents delivery system and delivery method - Google Patents

Abstract

PURPOSE: A web contents transmission system and transmission control method are provided to eliminate the bottle neck state in web server and network in the transmission of web contents on world wide web(www). CONSTITUTION: The web contents transmission system serving web documents stored in web server to each of the clients comprises a client(102), a client domain name server(104), an intelligent domain name server(106), web cache clusters(110/1, 110/2) and a web server(112). The client domain name server(104) determines the intelligent DNS(106) in charger of the domain name interpretation for specific web server. The intelligent DNS(106) selects the nearest web cache cluster to the service request client among a plurality of web cache clusters installed at each network. The client(102) and the web cache clusters(110/1, 110/2), and the web cache clusters and the web server(112) are mutually connected through internet network(108).

Description

Web content delivery system and delivery control method {WEB CONTENTS DELIVERY SYSTEM AND DELIVERY METHOD}

The present invention relates to a technique for controlling the delivery of web content on the World Wide Web, and more particularly, to a web content suitable for eliminating bottlenecks in web servers and networks when delivering web content on the World Wide Web. A transmission system and a transmission control method thereof.

In recent years, the exponential growth in the number of users on the Internet has resulted in immense loads on the traffic paths (network lines) between Internet servers, especially web servers and clients, and these overloads cause server bottlenecks and network bottlenecks. It is acting as a major factor that significantly reduces the quality of service to clients.

In a typical conventional client-server system, as shown in FIG. 3 as an example, a number of clients 302 connect to a web server 306 via an internet network 304 to provide desired information (ie, data data). It has a form of service. In these systems, a web server installed on the network handles the services for all clients directly.

That is, when the client 302 requests a web document from the web server 306 together with a uniform resource locator (URL) (transmission of an information request packet), the web server 306 sends the web document specified by the URL to its own database. After constructing the information packet from the service and then configured to service the information packet configured through the Internet network 304 to the client 302.

However, the manner in which the web server 306 handles all client requests has a problem that the quality of service is considerably reduced due to the bottleneck in the web server and the network due to the rapid increase of Internet users. Therefore, in order to eliminate the bottleneck, we can consider using a high-performance server or a cluster of multiple servers and leasing a high-bandwidth network. However, these methods require high installation and management costs. Rather, the limited bandwidth of a single network circuit is inherently limited in eliminating bottlenecks in the network.

Therefore, as one of the methods for solving the bottleneck as described above, methods for supporting a high speed web service by minimizing the bottleneck using a web cache have been proposed and used.

4 is a schematic diagram of a web content delivery system using a conventional web cache, and includes a client 402, a web server 404, and a web server 408.

Referring to FIG. 4, when the client 402 requests a web document with a URL, the web cache 404 intercepts and searches whether the web document designated by the URL is in its database, and the search result itself. If there is a requested web document in the database, the web cache 404 retrieves it and sends it to the client 402.

Unlike the above, if it is determined that the requested web document is not in the database of the web cache 404 or is not the latest document, the web cache 404 sends the web document to the web server 408 via the Internet network 406. To receive the request, and transmit the received web document to the client 402.

On the other hand, it is very important for a web server to provide a high quality service to all clients evenly in performing Internet networking. However, the conventional method using a web cache does not provide excellent service to all clients. In other words, only a client with a web cache receives a relatively good service, but a client without a web cache has a relatively low quality service.

Thus, the conventional method of using the web cache is a very passive method in which the web cache should be expected to be installed in the network of all clients from the point of view of the web server operator.

In addition, conventional methods using a web cache do not provide a high cache hit ratio because the web cache must store documents of all web servers. That is, from the point of view of the web server operator, all web documents cannot use the functions of the web cache because the documents of their web server may be removed from the web cache by the documents of other web servers. Cache hit ratios in such systems are known to be around 40-50%.

Accordingly, the present invention is to solve the above-mentioned problems of the prior art, the web server and network through the method of locally distributing a plurality of web cache cluster, and connecting the client to the adjacent web cache cluster using intelligent DNS. It is an object of the present invention to provide a web content delivery system and a transmission control method capable of providing a high speed web document service by eliminating the bottleneck in the network.

In accordance with the present invention, a web content delivery system for providing a plurality of clients with a web document stored in a web server is provided. The domain name resolution query for a specific web server comes from any client. A customer DNS configured to search a mapping table to determine an intelligent DNS that is in charge of domain name resolution of the specific web server, and to transfer access information about the determined intelligent DNS to the service request client; When the domain name resolution query of the specific web server comes from the service request client, a web cache cluster closest to the service request client is selected from a plurality of web cache clusters installed in each network, and the IP address of the selected web cache cluster is selected. Intelligent DNS for delivering to the service request client; And a plurality of web cache clusters configured to transmit an information packet to the service request client by constructing an information packet from the service request client when the service request for the web document comes from the service request client.

According to another aspect of the present invention, there is provided a web content transmission control method for serving a web document stored in a web server to a plurality of clients, wherein a domain name resolution query for a specific web server from any client is performed. And, searching for a mapping table to determine an intelligent DNS that is in charge of domain name resolution of the specific web server, and delivering the access information for the determined intelligent DNS to the service request client; Querying domain name resolution of the specific web server to access the determined intelligent DNS; In response to the domain name resolution query, selecting a web cache cluster closest to a corresponding client requesting a service among a plurality of web cache clusters installed in each network; Delivering the IP address of the selected web cache cluster to the corresponding client; Requesting a service of a web document to the selected web cache cluster using the IP address; And in response to the web document service request, servicing the web document to the corresponding client.

1 is a schematic diagram of a web content delivery system according to a preferred embodiment of the present invention;

2 is a flowchart showing a process of controlling the transmission of web content according to the present invention;

3 is a system diagram showing a connection between a typical client and a web server;

Figure 4 is a schematic diagram of a web content delivery system using a conventional web cache.

<Description of the code | symbol about the principal part of drawing>

102: Client 104: Customer DNS

106: Intelligent DNS 108: Internet Network

110/1, 110/2: Web Cache Cluster 112: Web Servers

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the core technical aspect of the present invention is to distribute a plurality of web cache clusters locally in a network, to store documents of a web server in a web cache cluster located closer to the client, and any client may By requesting a document service, a web cache cluster in close proximity to which intelligent DNS connects to serve the web document to the requesting client. This technical means eliminates bottlenecks in the web server and the network. The bar can be easily achieved.

1 is a schematic diagram of a web content delivery system according to a preferred embodiment of the present invention. The client 102, the customer DNS 104, the intelligent DNS 106, the web cache clusters 110/1, 110/2, and the web are shown in FIG. A server 112, and the client 102, the web cache clusters 110/1, 110/2, and the web cache clusters 110/1, 110/2, and the web server 112 are the Internet network 108. Are interconnected through.

Referring to FIG. 1, a customer DNS (Domain Name Server) 104 resolves a URL when a resolution query for a domain name (eg, an IP address request of www.server.com) comes from the client 102 with the URL. After searching the mapping table, the intelligent DNS that provides the service for the IP address requested by the client is determined, and a response message for inducing a connection to the intelligent DNS determined by the service is generated and delivered to the client 102. do. To this end, an NS record is stored in the mapping table in the customer DNS 104 to direct access to the intelligent DNS corresponding to each domain name.

Next, the intelligent DNS 106 receives a resolution query for the domain name from the client 102, e.g., a request for an IP address of www.server.com, and the rule or network predefined by the administrator. The web cache cluster determined to be closest to the client 102 requesting the service is considered in consideration of the current traffic situation, and the IP address of the determined web cache cluster (eg, 110/1) is transmitted to the client 102. To pass.

Also, the web cache cluster (eg, 110/1) connects to the web server 112 via the internet network 108 and stores the web documents of the web server 112, from the client 102. When a service request for a web document comes (ie, an information request packet is received), the document is found and sent to the service request client 102. Such a web cache cluster is composed of a plurality of web cache servers, so that each client requesting a service can provide a high quality service with high speed, high response time, and high availability.

That is, the web cache cluster 110/1 searches whether the web document designated by the URL is stored in its database. As a result of the search, the web document requested for the service from the client 102 is stored in its database. If so, the stored web document is retrieved, an information packet is constructed, and then transmitted to the client 102 who requested the service through the Internet network 108.

On the other hand, if there is no requested web document in the database of the search result web cache cluster 110/1 or it is not the latest document, the web cache cluster 110/1, the web server 112 through the Internet network 108 The web document is requested and received from the client, the web document is stored (or updated) in the database thereof, and then transmitted to the service request client 102.

In FIG. 1, the web cache cluster 110/1 and the web cache cluster 110/2 are clusters installed in different networks. In this embodiment, only two web cache clusters are illustrated.

Finally, when there is a request for information (i.e., a web document request) from any web cache cluster, the web server 112 retrieves the document and provides it to the requesting web cache cluster. Is a web server operating company, for example, portal sites, e-commerce sites, search sites, and online newspaper sites.

That is, the web content delivery system according to the present invention installs a plurality of web cache clusters in a network, and when an arbitrary client requests a web document service, intelligent DNS may be applied according to predefined rules or traffic conditions of the current network. By allowing the web cache cluster to choose and connect to provide web documents to clients who request services, it can reliably eliminate bottlenecks on web servers and networks, providing high-speed web document services to each client. can do.

Next, a process of controlling the transmission of web content according to a predefined rule or a current network traffic situation in the web content delivery system of the present invention having the above-described configuration will be described.

2 is a flowchart illustrating a process of controlling the transmission of web content according to the present invention.

Referring to FIG. 2, when the client 102 queries the customer DNS 104 for domain name resolution (IP address request) (step 202), the customer DNS 104 resolves the domain name and retrieves the mapping table. The intelligent DNS (eg, 106) that provides the service for the IP address requested by the client is determined, and a response message for inducing a connection to the intelligent DNS determined by the service is generated and forwarded to the client 102 (step 204). ). At this time, in the mapping table in the customer DNS 104, NS records for inducing access to the intelligent DNS corresponding to each IP address are stored in advance.

Next, when the client 102 receives a response message from the customer DNS 104, the client 102 analyzes the response message to determine the intelligent DNS, for example, the intelligent DNS 106, to which the client should query the resolution of the domain name. The intelligent DNS 106 is queried for resolution of the domain name of the web server to which it is to connect (step 206).

Subsequently, when the intelligent DNS 106 receives the query for resolving the domain name from the client 102, the intelligent DNS 106 refers to the client 102 that requested the service by referring to a rule predefined by the administrator or the current traffic state of the network. After determining the determined web cache cluster, for example, determining the web cache cluster 110/1, the IP address of the determined web cache cluster 110/1 is transmitted to the client 102 (step 208).

Accordingly, the client 102 connects to the web cache cluster 110/1 by using the IP address designated by the intelligent DNS 106 and requests the service of the web document required by the client 102 (step 210).

Next, the web cache cluster 110/1 checks whether the client 102 requesting the service is stored in its database or if it is up-to-date (step 212). If it is determined that the web document requested for the service is stored as the latest data in its database (i.e., cache heating), then the requested web document is fetched to construct an information packet (step 214). The information packet is transmitted to the corresponding client 102 through the internet network 108 (step 220).

As a result of the search in step 212, if it is determined that the web document requesting the service is not stored in its database or is not the latest document, the web cache cluster 110/1 determines that the internet network 108 The server accesses the web server 112 through the web document requesting the service, that is, transmits an information request packet to the server 112 (step 216).

Therefore, the web server 112 transmits the requested web document to the web cache cluster 110/1, and the web cache cluster 110/1 transfers the web document received from the web server 112 to its database. After storing (step 218), it is sent to the client 102 who requested the service (step 220).

Therefore, in the present invention, the cache hit close to 100% because the web cache cluster is distributed locally, most requests are handled by the web cache cluster, and each web cache cluster caches only the web documents of the subscribed customers. Can have a ratio.

In addition, in the present invention, since each web cache cluster is connected to a different network line, it is possible to increase service bandwidth by increasing the number of web cache clusters, and intelligent DNS assigns the fastest web cache cluster to a client requesting a service. As a result, delay time occurring in the network line can be minimized, thereby providing high quality service.

As described above, according to the present invention, when multiple web cache clusters are installed in a network, intelligent DNS selects and connects according to a predefined rule or a current network traffic condition when an arbitrary client requests a web document service. By allowing web cache clusters in close proximity to serve web documents to requesting clients, bottlenecks in web servers and networks can be reliably eliminated, providing high-speed web document services to each client on the World Wide Web. have.

Claims (7)

In a web content delivery system for serving a web document stored in a web server to a plurality of clients, When a domain name resolution query for a specific web server is received from an arbitrary client, the mapping table is searched to determine an intelligent DNS that is in charge of domain name resolution of the specific web server, and the access information for the determined intelligent DNS is requested for the service. Customer DNS for delivering to clients; When the domain name resolution query of the specific web server comes from the service request client, a web cache cluster closest to the service request client is selected from a plurality of web cache clusters installed in each network, and the IP address of the selected web cache cluster is selected. Intelligent DNS for delivering to the service request client; And When the service request for the web document from the service request client comes, the web content delivery system consisting of the plurality of web cache cluster to form an information packet to the web request to the service request client. The system of claim 1, wherein the intelligent DNS selects the proximity web cache cluster according to a predefined rule. The web content delivery system of claim 1, wherein the intelligent DNS selects the proximity web cache cluster by referring to a traffic condition of a network. 4. The web content delivery system according to claim 1, 2 or 3, wherein each web cache cluster comprises a plurality of web cache servers. In the web content transmission control method for serving a web document stored in a web server to a plurality of clients, When a domain name resolution query for a specific web server is received from an arbitrary client, the mapping table is searched to determine an intelligent DNS that is in charge of domain name resolution of the specific web server, and the access information for the determined intelligent DNS is requested for the service. Delivering to the client; Querying domain name resolution of the specific web server to access the determined intelligent DNS; In response to the domain name resolution query, selecting a web cache cluster closest to a corresponding client requesting a service among a plurality of web cache clusters installed in each network; Delivering the IP address of the selected web cache cluster to the corresponding client; Requesting a service of a web document to the selected web cache cluster using the IP address; And And responding to the web document service request, servicing the web document to the corresponding client. 6. The method of claim 5, wherein the method selects the proximity web cache cluster according to a predefined rule. 6. The method of claim 5, wherein the method selects the proximity web cache cluster by referring to a traffic condition of a network.