KR100375121B1 - Web contents transmission method - Google Patents

Abstract

The present invention eliminates bottlenecks in web servers and networks by distributing a plurality of web cache clusters locally and connecting clients to adjacent web cache clusters using intelligent DNS or redirector, The present invention relates to a technique for distributing a plurality of web cache clusters to a network and storing documents of the web server in a web cache cluster located at a closer distance from the client , A web client service is provided to a requesting client from a proximity web cache cluster connected by an intelligent DNS or a redirector when an arbitrary client requests a web document service, thereby eliminating bottlenecks in the web server and the network, On It is possible to provide a high-speed web document service to each client.

Description

{WEB CONTENTS TRANSMISSION METHOD}

The present invention relates to a technique for controlling web content transmission on the World Wide Web (WWW), and more particularly, to a technique for controlling web content transmission on the World Wide Web And a control method.

In recent years, as the number of users on the Internet has increased exponentially, there has been an enormous load on the traffic path (network line) between the Internet server, especially the Web server and the client. Such overloading causes server bottlenecks and network bottlenecks Which is a major factor in significantly lowering the quality of service for clients.

5, a plurality of clients 502 access the web server 506 via the Internet 504 and transmit desired information (i.e., data data) to the web server 506. [ Service. In such a system, a web server installed on the network directly handles services for all clients.

That is, when the client 502 requests a web document to the web server 506 (transmission of an information request packet) together with a URL (Uniform Resource Locator), the web server 506 transmits the web document specified by the URL to its database And forms an information packet, and then services the information packet configured on the Internet 504 to the client 502. [

However, the way in which the web server 506 processes all the clients' requests has a problem that the service quality is significantly reduced due to a bottleneck in the web server and the network due to the rapid increase of the internet users. Therefore, in order to eliminate the bottleneck, it is possible to consider a high-performance server, a cluster with a plurality of servers, and a leased network of a high-bandwidth network. However, this method requires high installation cost and management cost However, due to the limited bandwidth of a single network line, the bottleneck in the network can not be solved fundamentally.

Accordingly, as one of the measures to overcome the bottleneck phenomenon described above, methods for supporting a high-speed web service by minimizing a bottleneck phenomenon using a web cache have been proposed and used.

FIG. 6 is a block diagram of a web content transmission system using a conventional web cache, which includes a client 602, a web cache 604, and a web server 608.

Referring to FIG. 6, when the client 602 requests a web document together with a URL, the web cache 604 intercepts the web document to search whether the web document specified by the URL exists in its database, If there is a requested web document in the database, the web cache 604 fetches it and sends it to the client 602.

If it is determined that the requested web document does not exist or is not the latest document in the database of the web cache 604, the web cache 604 transmits the corresponding web document to the web server 608 via the Internet 606 And transmits the received web document to the client 602.

Meanwhile, in performing Internet networking, it is very important that a web server provides a high quality service evenly to all clients. However, the conventional method using a web cache can not provide excellent service to all clients. That is, only a client installed with a web cache receives a comparatively excellent service, and a client without a web cache installed can only receive a relatively low quality service.

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

Also, the conventional method of using the web cache does not provide a high cache hit ratio because the web cache must store documents of all the web servers. That is, from the viewpoint of the web server operator, since the document of the web server of the user can be removed from the web cache by the document of the other web server, not all the web documents can utilize the function of the web cache. The cache hit ratio in such a system is generally known to be about 40 to 50%.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems occurring in the prior art, and it is an object of the present invention to provide a method and system for locally distributing a plurality of web cache clusters and connecting clients to adjacent web cache clusters using an intelligent DNS or a redirector And a web content transmission control method capable of providing a high-speed web document service by eliminating bottlenecks in a web server and a network.

According to another aspect of the present invention, there is provided a web content transmission control method for providing a web document stored in a web server to a plurality of clients, the method comprising the steps of: Determining a redirector and transmitting access information for the determined redirector to the service requesting client; Requesting the specific web document to the determined redirector; In response to the specific web document request, a redirector requesting service selection information from a plurality of web cache clusters installed in each network; Selecting a proximity web cache cluster closest to a corresponding client requesting service among the plurality of web cache clusters based on service selection information received from each web cache cluster; Transmitting a URL of the selected proximity web cache cluster to the corresponding client; And receiving a web document service from the proximity web cache cluster using the URL.

1 is a block diagram of a web content transmission system according to an embodiment of the present invention;

2 is a flow chart illustrating a process of controlling transmission of web content according to an embodiment of the present invention;

3 is a flow diagram of a web content transmission system according to another embodiment of the present invention,

FIG. 4 is a flow chart illustrating a process of controlling transmission of web content according to another embodiment of the present invention;

5 is a system diagram showing a connection between a conventional client and a web server,

6 is a flow diagram of a web content transmission system using a conventional web cache.

Description of the Related Art

102, 302: client 104, 304: customer DNS

106: Intelligent DNS 108, 308: Internet

110/1, 110/2, 310/1 - 310/4: Web Cache Cluster

112, 312 Web server 306 Redirector

These and other objects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

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

The present invention provides a method and apparatus for locally distributing a plurality of web cache clusters to a network and storing documents of the web server in a web cache cluster located at a closer distance from the client, The proximity of the web cache cluster to which the intelligent DNS or redirector connects when requesting the service provides the web client to the requesting client. By eliminating the bottleneck in the web server and the network through this technical means, Can easily be achieved.

FIG. 1 is a block diagram of a web content transmission system according to an embodiment of the present invention. Referring to FIG. 1, a client 102, a customer DNS 104, an intelligent DNS 106, a web cache cluster 110/1, 110/2, Server 112 and the client 102 and the web cache clusters 110/1 and 110/2 and the web cache clusters 110/1 and 110/2 and the web server 112 include the Internet 108 Lt; / RTI >

Referring to FIG. 1, a customer DNS (Domain Name Server) 104 interprets a URL when an interpretation query for a domain name (for example, an IP address request of www.server.com) is received from the client 102 And determines the intelligent DNS providing the service for the IP address requested by the client by searching the mapping table according to the analysis result, generates a response message for guiding the connection to the determined intelligent DNS, and transmits the response message to the client 102 do. To this end, the mapping table in the customer DNS 104 stores an NS record for guiding the access to the intelligent DNS corresponding to each domain name.

Next, when the intelligent DNS 106 receives a request for an interpretation of the domain name from the client 102, for example, an IP address of www.server.com, A web cache cluster determined to be closest to the client 102 that has requested the service is determined in consideration of the current traffic situation and the IP address of the determined web cache cluster (for example, 110/1) is sent to the client 102 .

Web cache clusters (e.g., 110/1) also connect to the Web server 112 via the Internet 108 and store Web documents of the Web server 112, When a service request for a document comes (that is, an information request packet is received), the document is found and transmitted to the service request client 102. Such a Web cache cluster can be constituted by a plurality of Web cache servers, thereby providing high-speed processing, high-speed response time, and high-quality services with high availability to each client requesting the service.

That is, the web cache cluster 110/1 searches whether the web document designated by the URL is stored in its own database. If there is a web document in which the service is requested from the client 102 in the database of the search result Fetches the stored web document to form an information packet, and transmits the information packet to the client 102 requesting the service through the Internet 108. [

On the other hand, if the requested web document does not exist or is not the latest document in the database of the search result web cache cluster 110/1, the web cache cluster 110/1 sends the request to the web server 112 via the Internet 108 (Or updates) the received web document to its own database, and then transmits the stored web document to the service request client 102. [

On the other hand, unlike the passive caching method described above in which each web cache cluster caches the content accessed by the first client in the web cache cluster in the specific web document information of the web server, Content can be cached.

In other words, the web cache cluster receives a definition and update rule for what content to be cached from each content provider (i.e., a web server), and an active caching method of caching content defined according to the definition and rules in advance in the corresponding web cache cluster To a certain client through a mirroring method of caching the web cache cluster in such a manner as to provide contents to an arbitrary client or to copy part or whole contents of the web server in advance according to a schedule rule received from a contents provider (web server) In the case of the mirroring method, the content of the web cache cluster is updated only when the content provider requests the content.

Accordingly, in the present invention, the passive caching method, the active caching method, or the mirroring method described above can be appropriately selected and used according to the necessity or use, and in some cases, the caching method may be changed according to the content of each content It can also be used as a composite caching method.

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 by way of example.

Finally, when there is an information request (i.e., a web document request) from any web cache cluster, the web server 112 fetches the corresponding document and provides the information to the requested web cache cluster or, according to a predetermined rule and update rule A customer of the web server 112 may be a portal server, an e-commerce site, a search site, an online newspaper, etc., as a web server operating company, for example. Site are the main customers.

That is, the web content transmission system according to the present invention distributes a plurality of web cache clusters locally in a network, and when an arbitrary client requests a web document service, a predetermined rule or an intelligent Since the Web cache cluster selected by the DNS and connected thereto provides the Web document (content) to the client requesting the service, it is possible to reliably eliminate the bottleneck in the web server and the network, Web document service can be provided.

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

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

Referring to FIG. 2, when the client 102 queries the customer DNS 104 for a domain name interpretation (step 202), the customer DNS 104 interprets the domain name, searches the mapping table The client determines an intelligent DNS (e.g., 106) that provides a service for the requested IP address and generates and sends a response message to the client 102 to induce a connection to the determined intelligent DNS (step 204 ). At this time, the mapping table in the customer DNS 104 stores an NS record for guiding the access to the intelligent DNS corresponding to each IP address.

Next, when a response message is received 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 domain 102 should inquire about the interpretation of the domain name, And inquires the intelligent DNS 106 about the interpretation of the domain name of the web server to which it wants to connect (step 206).

Next, in the intelligent DNS 106, when receiving the domain name analysis query from the client 102, the intelligent DNS 106 refers to the rule defined beforehand by the administrator or the current traffic situation of the network, After determining the web cache cluster to be determined, for example, the web cache cluster 110/1, the determined IP address of the 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 using the IP address specified by the intelligent DNS 106 to request the service of the web document (content) it needs (step 210) .

Next, in the web cache cluster 110/1, if the web document requested by the client 102 is stored in its own database or stored (step 212) (I.e., cache heating), the requested web document is fetched to form an information packet (step 214), and then the Internet And transmits the information packet to the corresponding client 102 through the network 108 (step 220).

If it is determined in step 212 that the requested web document is not stored in its own database or is not the latest document, the web cache cluster 110 / And transmits the information request packet to the server 112 via the web server 112 (step 216).

Accordingly, the web server 112 transmits the requested web document to the web cache cluster 110/1. In the web cache cluster 110/1, the web server 112 transmits the web document received from the web server 112 to its own database (Step 218) and transmits the service to the requesting client 102 (step 220).

Meanwhile, in the above-described embodiment, contents are provided to an arbitrary client through a passive method of caching the contents accessed by the first client in the web cache cluster in the specific web document information of the web server. However, But is not necessarily limited thereto.

In other words, in the method according to the present embodiment, each web cache cluster receives definition and update rules for what contents to cache from each content provider (i.e., web server), and pre- A server for providing a content to an arbitrary client requesting a content service through an active caching method cached from the server, or a mirroring unit for caching a part or all of contents of a web server in advance according to a schedule rule received from a content provider (a web server) To provide content to any client requesting the content service. At this time, in the case of the mirroring method, the contents of the web cache cluster are updated only when there is a request from the contents provider.

Accordingly, in the method according to the present embodiment, a passive caching method, an active caching method, or a mirroring method can be appropriately selected and used according to need or usage, and in some cases, a caching method It can also be used as a different caching method.

Therefore, in the present invention, since a plurality of web cache clusters are distributed and installed locally, most of the requests are handled by a nearby web cache cluster, and each web cache cluster only caches web documents of customers (i.e., clients) May have a cache hit ratio close to 100%.

In the present invention, since each web cache cluster is connected to different network lines, the service bandwidth can be increased by increasing the number of web cache clusters, and the intelligent DNS assigns the fastest web cache cluster The delay time occurring in the network line can be minimized, and a high quality service can be provided.

3 is a block diagram of a web content transmission system according to another embodiment of the present invention. The client 302 includes a client DNS 304, at least one redirector 306, a plurality of web cache clusters 310 / 4 and the web server 312. The client 302 and the web cache clusters 310/1 to 310/4 and the web cache clusters 310/1 to 310/4 and the web server 312 include the Internet Lt; RTI ID = 0.0 > 308 < / RTI >

Referring to FIG. 3, the web content transmission system according to the present embodiment adopts the redirector 306 instead of the intelligent DNS 106 employed in the transmission system of the embodiment described above. And the configuration and functions of the remaining constituent members except for this difference are substantially the same as or substantially similar to those in the above-described embodiment.

Although only one redirector 306 is shown in FIG. 3, the redirectors 306 are not necessarily limited to one, and a plurality of redirectors 306 may be installed according to the number of web cache clusters considering the network size. In this case, the mapping table in the customer DNS 304 stores an NS record for guiding the connection to the redirector corresponding to each domain name.

Therefore, in order to improve the understanding through the simplification of description and to avoid unnecessary redundant description, in this embodiment, the service provided by the redirector 306 (i.e., the URL information service of the web cache cluster closest to the client requesting the content service) I will explain only the characteristic parts that are central.

First, when the client 302 queries the interpretation of the domain name together with the URL (for example, an IP address request of www.server.com), the customer DNS 304 interprets the received URL, The mapping table is searched to determine a redirector (e.g., 306 in FIG. 3) that provides a service for the URL requested by the client 302, and a response message to induce a connection to the determined redirector 306 And delivers it to the client 302.

Then, when a web document request comes from the client 302, the redirector 306 searches the mapping table according to a predefined rule by the administrator, and searches each of the web cache clusters 310/1 - 310/4 registered therein. (I.e., the distance between the web cache cluster and the client 302) and the current traffic state information of the network, and in response to this request, requests each web cache cluster 310/1 - 310 / (E.g., 310/4 in FIG. 3) closest to the client 302 that has requested the service, by referring to the distance information received from the mobile terminal 300 and the current traffic status information of the network, (For example, 310/4) to the corresponding client 302.

Accordingly, the client 302 requesting the content service can access the web cache cluster 310/4 using the URL received from the redirector 306, thereby receiving the necessary content.

As with the web cache clusters in the above-described embodiment, each of the web cache clusters employed in the web content transmission system according to the present embodiment may be a passive method, an active method, a mirroring method, or a hybrid method The content can be cached from the corresponding web server.

Accordingly, the web content transmission system according to the present embodiment can reliably eliminate the bottleneck phenomenon in the web server and the network as in the above-described embodiment, and can provide a high-speed web document service to each client .

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

FIG. 4 is a flowchart illustrating a process of controlling transmission of web content according to another embodiment of the present invention.

4, when the client 102 queries the customer DNS 304 for a domain name interpretation (step 402), the customer DNS 304 interprets the domain name, searches the mapping table The client determines a redirector (e.g., 306) that provides a service for the requested URL and generates a response message to direct the connection to the determined redirector 306 and passes it to the client 302 ). At this time, the mapping table in the customer DNS 304 stores an NS record for guiding the connection to the redirector corresponding to each IP address.

Next, when a response message is received from the customer DNS 304, the client 302 analyzes the response message and queries the corresponding redirector 306 for the URL of the web server to which the client 302 wants to connect (step 406).

Then, in response to the URL query from the client 302, the redirector 306 searches the mapping table according to a rule defined in advance and sends the mapping table to each web cache cluster 310/1 - 310/4 I.e., the distance information between the web cache cluster and the client 302 and the current traffic state information of the network (step 408).

In response to this, the web cache clusters 310/1 - 310/4 collect distance information of the client 392 and the current traffic state information of the network and transmit them to the redirector 306 through the Internet 308 (Step 410).

Next, the redirector refers to the distance information received from each of the web cache clusters 310/1 - 310/4 and the current traffic status information of the network, and searches the web cache cluster closest to the client 302 requesting the service , 310/4 of FIG. 3) and then passes the URL of the determined web cache cluster (e.g., 310/4) to the client 302 (step 412).

Accordingly, the client 302 connects to the web cache cluster 310/4 using the URL designated by the redirector 306, and requests the service of the web document (content) needed by the client 302 (step 414).

Next, in the Web cache cluster 310/4, if the Web document requested by the client 302 is stored in its own database or stored (step 416), it is checked if it is the latest data If it is determined that the web document requested by the search result service is stored as the latest data in its database (i.e., cache heating), the requested web document is fetched to form an information packet (step 418) 308 to the corresponding client 302 (step 424).

If it is determined in step 416 that the web document requesting the service is not stored in its own database or is not the latest document, the web cache cluster 310 / The web server 312 accesses the web server 312 to request a web document for which a service is requested, that is, transmits an information request packet to the web server 312 (step 420).

Accordingly, the web server 312 transmits the requested web document to the web cache cluster 310/4. In the web cache cluster 310/4, the web server 312 transmits the web document received from the web server 312 to its database (Step 422) and sends the service to the requesting client 302 (step 424).

Meanwhile, in the above-described embodiment, contents are provided to an arbitrary client through a passive method of caching the contents accessed by the first client in the web cache cluster in the specific web document information of the web server. However, But is not necessarily limited thereto.

That is, in the method according to the present embodiment, as in the above-described embodiments, each web cache cluster is configured to cache content from the corresponding web server through a passive method, an active method, a mirroring method, .

Accordingly, the web content transmission system according to the present embodiment can reliably eliminate the bottleneck phenomenon in the web server and the network as in the above-described embodiment, and can provide a high-speed web document service to each client .

As described above, according to the present invention, a plurality of web cache clusters are installed at the end of a network, and when an arbitrary client requests a web document service, an intelligent DNS or a redirector It is possible to reliably eliminate the bottleneck in the web server and the network by selecting the closest distance web cache cluster and enabling the client to receive the web document service from the selected proximity distance web cache cluster, Speed web document service to each client on the web.

Claims (20)

delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete A web content transmission control method for providing a plurality of clients with a web document stored in a web server, When a domain name resolution query for a specific web document comes from an arbitrary client, the customer DNS searches the mapping table to determine a redirector responsible for URL interpretation of the web cache cluster, and transmits the access information for the determined redirector to the service request client ; Querying the determined redirector for domain name interpretation of the specific web server; Requesting service selection information to a plurality of web cache clusters installed in each network in response to the domain name interpretation query; Selecting a proximity web cache cluster closest to a corresponding client requesting service among the plurality of web cache clusters based on service selection information received from each web cache cluster; Transmitting a URL of the selected proximity web cache cluster to the corresponding client; And And receiving a web document service from the proximity web cache cluster using the URL. The web content transmission control method according to claim 17, wherein the service selection information is distance information between each web cache cluster and a service request client and current traffic situation information of the network. 19. The method of claim 17 or 18, wherein each of the web cache clusters includes: a passive method of caching content accessed by a first client to specific web document information; a predetermined content Wherein the contents are cached through a mirroring method of copying and caching a part or all of contents of a corresponding web server in advance according to an active caching method for pre-caching the contents or a rule received from the corresponding web server. The web content transmission control method according to claim 19, wherein each of the web cache clusters caches content in a mixing mode in which at least two of the passive method, the active method and the mirroring method are mixed.