WO2023115592A1

WO2023115592A1 - Back-to-source method and apparatus of cdn node server

Info

Publication number: WO2023115592A1
Application number: PCT/CN2021/141411
Authority: WO
Inventors: 孙涛
Original assignee: 江苏云工场信息技术有限公司
Priority date: 2021-12-21
Filing date: 2021-12-25
Publication date: 2023-06-29
Also published as: CN114338686A

Abstract

A back-to-source method of a CDN node server, comprising: obtaining a data request of a user terminal according to a connection relationship between a second-level CDN node server and the user terminal, and searching for corresponding request data according to the data request and sending the request data to the user terminal (S101); if the data request is not responded, the second-level CDN node server sending the data request to a first-level CDN node server to search for the request data and send same to the user terminal (S102); and if the data request is not responded, the first-level CDN node server sending the data request to a source server to search for the request data and send same to the user terminal (S103). The request data is provided by means of the multi-level CDN node servers, so that the number of times that the data returns back to a source node server is greatly reduced, the load of the source node server is reduced, and the stability of data obtaining is improved.

Description

A method and device for returning to the source of a CDN node server

technical field

The present application relates to a data access method, in particular to a CDN node server back-to-source method. The present application also relates to a method and device for back-to-source of a CDN node server.

Background technique

The basic idea of CDN (Content Distribution Network) is to avoid bottlenecks and links on the Internet that may affect the speed and stability of data transmission as much as possible, so as to make content transmission faster and more stable. Its main setting method is to form a layer of intelligent virtual network based on the existing Internet by placing node servers all over the network. Comprehensive information such as distance and response time will redirect the user's request to the service node closest to the user. Its purpose is to enable users to obtain the required content nearby, solve the congestion situation of the Internet network, and improve the response speed of users' access to websites.

In the existing technology, the conventional CDN back-to-origin strategy is that when a user visits a certain URL, if the resolved CDN node does not cache the content of the response, or the cache has expired, it will go back to the origin site Acquisition, this method of returning to the source will cause a lot of load pressure on the source site, which will affect the stability and speed of data acquisition.

Contents of the invention

In order to solve the problem of excessive load on the origin site caused by conventional back-to-source methods, this application provides a back-to-source method for CDN node servers. The present application also relates to a method and device for back-to-source of a CDN node server.

This application provides a back-to-source method for a CDN node server, including:

Obtain the data request of the client according to the connection relationship between the secondary CDN node server and the client, and search for corresponding request data according to the data request and send it to the client;

If the data request does not respond, the secondary CDN node server sends the data request to the primary CDN node server to search for the requested data and send it to the client;

If the data request is not responded, the primary CDN node server sends the data request to the source server to search for the requested data and send it to the client.

Optionally, before the data request is sent to the source server, it also includes:

The first-level node server sends the data request to an adjacent first-level CDN node server to search for the requested data and send it to the client.

Optionally, the obtaining the data request of the client according to the connection relationship between the secondary CDN node server and the client includes:

Obtaining location information of multiple secondary CDN node servers, judging distance information between the secondary CDN node server and the client according to the location information, and determining the secondary CDN node server according to the distance information.

Optionally, the non-response to the data request includes: the data is not stored, the data is invalid or the data is wrong.

Optionally, the secondary CDN node server and the primary CDN node server record load information in real time, and when the load information exceeds a preset threshold, forward the data request to an adjacent CDN node server at the same level.

The present application also provides a back-to-source device for a CDN node server, including:

The back-to-source module is used to obtain the data request of the client according to the connection relationship between the secondary CDN node server and the client, and search for corresponding request data according to the data request and send it to the client;

The first forwarding module is configured to send the data request to the first-level CDN node server by the secondary CDN node server if the data request is not responded to, and send the request data to the client;

The second forwarding module is used to send the data request to the source server if the data request is not responded to by the first-level CDN node server to search for the request data and send it to the client.

Optionally, the second forwarding module further includes:

The parallel forwarding unit is used for the first-level node server to send the data request to an adjacent first-level CDN node server to search for the requested data and send it to the client.

Optionally, also include:

A location query module, configured to acquire location information of multiple secondary CDN node servers, judge distance information between the secondary CDN node server and the client according to the location information, and determine the secondary CDN according to the distance information node server.

Advantages of the present application relative to the prior art:

The present application provides a CDN node server back-to-source method, including: obtaining the data request of the client according to the connection relationship between the secondary CDN node server and the client, and searching for the corresponding request data according to the data request and sending it to the client; If the data request does not respond, the secondary CDN node server sends the data request to the primary CDN node server to search for the requested data and sends it to the client; if the data request does not respond, the primary CDN The node server sends the data request to the source server to search and send the requested data to the client. The request data is provided through multi-level CDN node servers, which greatly reduces the number of times data returns to the source node server, reduces the load on the source node server, and improves the stability of data acquisition.

Description of drawings

Fig. 1 is a flow chart of back-to-source of the CDN node server in this application.

FIG. 2 is a schematic diagram of parallel requests for CDN node server data in this application.

FIG. 3 is a schematic diagram of a back-to-source device of a CDN node server in this application.

Detailed ways

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar promotions without violating the connotation of the present application. Therefore, the present application is not limited by the specific implementation disclosed below.

Please refer to FIG. 1 , S101 obtains the data request of the client according to the connection relationship between the secondary CDN node server and the client, and searches for corresponding request data according to the data request and sends it to the client.

The CDN node servers described in this application are multi-level distributed, including source servers, and the original server is a general server, including data original storage is performed in the source server. The source server is connected to multiple first-level CDN servers, and the first-level servers are distributed in various regions. For example, the region can be a country or a province. The first-level CDN node servers are also connected to each other, and can perform communication and data transmission.

Each of the first-level CDN servers is connected to multiple second-level CDN servers, and the second-level CDN servers obtain request data from the source server through the first-level CDN servers, and send the request data to each client end.

In this application, each CDN server, including the first-level CDN server and the second-level CDN server, performs data transmission through a communication optical cable connection. Concretely, each described CDN server is a node, and it comprises CDN Cache equipment, then each node forms CDN node system, and described each node is managed by SLB (load balancing) equipment. Wherein, the CDN Cache device is the main functional device in the node.

In this application, the client connects and communicates with the secondary CDN node server. Specifically, the secondary CDN node server is the node with the optimal distance, which is used to reduce the transmission time of requested data and reduce the waiting time of users. Preferably, the present application obtains the location information of multiple secondary CDN node servers, judges the distance information between the secondary CDN node server and the client according to the location information, and determines the secondary CDN node server according to the distance information. node server.

Another embodiment is to judge the optimal secondary CDN node server for back-to-source according to the following formula, the formula is as follows:

P＝R*T*Tio*C*F/S

Wherein, the S is the geographical distance, R is the available disk space of the CDN server, T is the output bandwidth, Tio is the I/O bandwidth of the disk, C is the processing power of the CPU, and F is the free resource of the CDN node . The greater the P, the greater the selection weight.

The user pair sends a data request to the secondary CDN node server, and the secondary CDN node server obtains the data request of the client according to the connection relationship between the secondary CDN node server and the client, and searches for a corresponding request according to the data request Data is sent to the client.

Usually, if a user has requested the request data, the secondary CDN node server may increase the request data according to the data request. The secondary CDN node server queries and searches the request data from the cache, and when the request data is found, sends the request data to the client for display.

Please refer to FIG. 1, S102 If the data request is not responded, the secondary CDN node server sends the data request to the primary CDN node server to search for the requested data and send it to the client.

In this application, if the requested data has not been applied for by the client, the data will not exist in the secondary CDN server, or the requested data is invalid due to too long time, and the requested data cannot be provided At this time, the secondary CDN node server will not be able to respond to the data request of the client. Specifically, the non-response to the data request includes: the data is not stored, the data is invalid or the data is wrong. The client mentioned in this application refers to any client connected to the same secondary CDN server.

In a specific operation, the secondary node server will set a preset search time period, and if the data request has not been responded to within the preset time period, it will be determined that the secondary CDN server has not responded.

Next, the secondary CDN server sends the data request to a primary CDN server directly connected to the secondary CDN server, and the primary CDN server searches for the requested data and sends the requested data to the secondary CDN server. The above request data is sent to the client.

Please refer to FIG. 2, S201: When the primary CDN node server does not respond to the data request, send the data request to an adjacent primary CDN server.

If the first-level CDN server does not respond, it is determined that the first-level CDN node server cannot provide the requested data, so the search can be continued from the first-level node servers adjacent to the first-level CDN node server.

Please refer to FIG. 2 , the adjacent first-level CDN server sends the data request to the source server.

Please refer to FIG. 1, S103 If the data request is not responded, the primary CDN node server sends the data request to the source server to search for the requested data and send it to the client.

When the first-level CDN node server or the adjacent first-level CDN node server does not respond to the data request, it is determined that the first-level CDN node server or the adjacent first-level node server does not have the requested data cached, so it is necessary to Obtained from the source server, so the data request is sent to the source server to search for the requested data, and the requested data is sent to the client.

At this time, the first-level CDN node server and the second-level CDN node server cache the request data. When the requested data is requested again, it may be obtained from the secondary or primary CDN node server. Preferably, the second-level CDN node server and the first-level CDN node server also record load information in real time, and when the load information exceeds a preset threshold, forward the data request to an adjacent CDN node server at the same level.

After the secondary CDN node server obtains the requested data, it will determine the device type of the user terminal according to the user's data request, process the data according to the device type, and send it to the user terminal for display.

Preferably, the secondary CDN node server further includes a historical data storage device, and the historical data storage device stores historical data and a table corresponding to device types and historical data. After the secondary CDN node server obtains the data request, it first judges the type of client device included in the data request, and searches the history data from the device type and historical data correspondence table according to the device type to see if there is If there is no request data corresponding to the type of the client device requested by the client, it will be returned to the source, and if it is, the historical data will be sent to the client.

The present application also provides a back-to-source device for a CDN node server, including: a back-to-source module 301 , a first forwarding module 302 and a second forwarding module 303 .

Please refer to FIG. 3 , the back-to-source module 301 is used to obtain the data request of the client according to the connection relationship between the secondary CDN node server and the client, and search for corresponding request data according to the data request and send it to the client.

P＝R*T*Tio*C*F/S

Please refer to FIG. 3 , the first forwarding module 302 is configured to send the data request to the first-level CDN node server if the data request is not responded to by the second-level CDN node server. user terminal.

Please refer to FIG. 3 , the second forwarding module 303 is configured to, if the data request is not responded to, the first-level CDN node server sends the data request to the source server to search for the requested data and send it to the client.

Claims

A method for returning to the source of a CDN node server, characterized in that it includes:

Obtain the data request of the client according to the connection relationship between the secondary CDN node server and the client, and search for corresponding request data according to the data request and send it to the client;

If the data request does not respond, the secondary CDN node server sends the data request to the primary CDN node server to search for the requested data and send it to the client;

If the data request is not responded, the primary CDN node server sends the data request to the source server to search for the requested data and send it to the client.
The method for returning to the source of the CDN node server according to claim 1, further comprising: before the data request is sent to the source server:

The first-level node server sends the data request to an adjacent first-level CDN node server to search for the requested data and send it to the client.
The method for returning to the source of the CDN node server according to claim 1, wherein said obtaining the data request of the client according to the connection relationship between the secondary CDN node server and the client includes:

Obtaining location information of multiple secondary CDN node servers, judging distance information between the secondary CDN node server and the client according to the location information, and determining the secondary CDN node server according to the distance information.
The back-to-source method of the CDN node server according to claim 1, wherein the non-response to the data request includes: data not stored, data failure or data error.
According to the method for returning to the source of the CDN node server according to claim 1, it is characterized in that the second-level CDN node server and the first-level CDN node server record load information in real time, and when the load information exceeds a preset threshold, the The above data request is forwarded to the adjacent CDN node server at the same level.
A device for returning to the source of a CDN node server, characterized in that it includes:

The back-to-source module is used to obtain the data request of the client according to the connection relationship between the secondary CDN node server and the client, and search for corresponding request data according to the data request and send it to the client;

The first forwarding module is configured to send the data request to the first-level CDN node server by the secondary CDN node server if the data request is not responded to, and send the request data to the client;

The second forwarding module is configured to: if the data request is not responded to, the first-level CDN node server sends the data request to the source server to search for the requested data and send it to the client.
According to the back-to-source device of the CDN node server according to claim 6, wherein the second forwarding module further comprises:

The parallel forwarding unit is used for the first-level node server to send the data request to an adjacent first-level CDN node server to search for the requested data and send it to the client.
The back-to-source device of the CDN node server according to claim 6, further comprising:

A location query module, configured to acquire location information of multiple secondary CDN node servers, judge distance information between the secondary CDN node server and the client according to the location information, and determine the secondary CDN according to the distance information node server.
According to the back-to-source device of the CDN node server according to claim 6, wherein the non-response to the data request includes: data not stored, data failure or data error.
According to the back-to-source device of the CDN node server according to claim 6, it is characterized in that, the second-level CDN node server and the first-level CDN node server record load information in real time, and when the load information exceeds a preset threshold, the The above data request is forwarded to the adjacent CDN node server at the same level.