CN108111623A - A kind of communication means and device based on content distributing network CDN - Google Patents

Abstract

Embodiments of the present invention provide a communication method and device based on a content distribution network CDN. There are multiple nodes in the content distribution network, and some nodes form a cluster. The method includes: receiving an access request in the current node; Allocate the target node for processing the access request; send an operation instruction to the target node through a preset connection to operate on the access request and obtain an operation result; receive the returned information from the target node through the connection The result of the above operation; return the access result according to the result of the operation. By forming a small-scale cluster of some nodes in the content distribution network, the communication connection between nodes in the cluster is realized, and there is no need to use multicast for communication, which greatly improves the flexibility of communication.

Description

A communication method and device based on content distribution network CDN

technical field

The present invention relates to the technical field of communication, in particular to a CDN-based communication method and a CDN-based communication device.

Background technique

CDN (Content Delivery Network, content distribution network) is often used in websites to transmit data. CDN adds a new network structure to the existing network and deploys multiple nodes for caching data so that users Data can be transmitted to or obtained from nearby nodes to provide corresponding services.

At present, multicast is used between each node of the CDN to broadcast data packets to realize communication within the cluster, and the communication flexibility is low.

Contents of the invention

In view of the above problems, the present invention is proposed to provide a CDN-based communication method and a corresponding CDN-based communication device that overcome the above problems or at least partially solve the above problems.

According to one aspect of the present invention, a communication method based on a content distribution network CDN is provided. There are multiple nodes in the content distribution network, and some nodes form a cluster, including:

Receive an access request in the current node;

Allocating a target node for processing the access request in the cluster;

sending an operation instruction to the target node through a preset connection to operate on the access request and obtain an operation result;

receiving the operation result returned by the target node through the connection;

The access result is returned according to the operation result.

Optionally, also include:

Find a preset configuration file, the configuration file records the node identifier of the node in the cluster;

Load the node ID into memory.

Optionally, also include:

In the current node, a connection is established with the node corresponding to the node identifier through the transmission control protocol TCP.

Optionally, also include:

sending heartbeat information to other nodes in the cluster through the connection in the current node;

Determine the status of other nodes in the cluster through the heartbeat information;

When the state is online, keep the node identifiers of other nodes in the cluster in the memory;

When the state is offline, delete the node identifiers of other nodes in the cluster in the memory.

Optionally, also include:

When adding a new node in the cluster, add the node identifier of the new node in the configuration file;

When deleting an original node in the cluster, delete the node identifier of the original node in the configuration file.

Optionally, the allocating the target node for processing the access request in the cluster includes:

Extracting an access address from the access request;

determining the online nodes in the cluster;

A target node is assigned from among the online nodes according to the access address.

Optionally, the determining online nodes in the cluster includes:

Look up the node ID in memory;

It is determined that the node corresponding to the node identifier is an online node.

Optionally, the allocating the target node from the online nodes according to the access address includes:

Count the number of online nodes in the cluster;

calculating a hash value for the access address, and taking the remainder of the quantity;

The node corresponding to the remainder is determined as the target node.

Optionally, the content distribution network CDN includes a central node, a parent layer node, and an edge node;

The central node communicates with the source website;

The parent layer nodes communicate with each other, communicate with the central node or the source website, and communicate with the edge node;

The edge node is used to communicate with the client;

Wherein, some of the parent layer nodes form a cluster, and/or, some of the edge nodes form a cluster.

According to another aspect of the present invention, a communication device based on a content distribution network CDN is provided. There are multiple nodes in the content distribution network, and some nodes form a cluster, including:

An access request receiving module, configured to receive an access request in the current node;

a target node allocation module, configured to allocate a target node for processing the access request in the cluster;

An operation instruction sending module, configured to send an operation instruction to the target node through a preset connection, so as to operate the access request and obtain an operation result;

An operation result receiving module, configured to receive the operation result returned by the target node through the connection;

An access result returning module, configured to return an access result according to the operation result.

Optionally, also include:

The configuration file search module is used to search for a preset configuration file, and the configuration file records the node identifier of the node in the cluster;

The node identification loading module is configured to load the node identification into memory.

Optionally, also include:

A connection establishment module, configured to establish a connection with the node corresponding to the node identifier through the transmission control protocol TCP in the current node.

Optionally, also include:

A heartbeat information sending module, configured to send heartbeat information to other nodes in the cluster through the connection in the current node;

A status determination module, configured to determine the status of other nodes in the cluster through the heartbeat information;

A node identification keeping module, configured to keep the node identifications of other nodes in the cluster in the memory when the status is online;

The node identifier deletion module is configured to delete the node identifiers of other nodes in the cluster in the memory when the status is offline.

Optionally, also include:

A configuration file adding module, configured to add a node identifier of the new node in the configuration file when adding a new node in the cluster;

The configuration file deletion module is configured to delete the node identifier of the original node in the configuration file when the original node is deleted in the cluster.

Optionally, the target node assignment module includes:

An access address extraction submodule, configured to extract an access address from the access request;

An online node determining submodule, configured to determine online nodes in the cluster;

The online node allocation submodule is configured to allocate a target node from the online nodes according to the access address.

Optionally, the online node determination submodule includes:

A memory search unit, configured to search for a node identifier in memory;

The node identifier determining unit is configured to determine that the node corresponding to the node identifier is an online node.

Optionally, the online node allocation submodule includes:

A quantity statistics unit, used to count the number of online nodes in the cluster;

a hash remainder unit, configured to calculate a hash value for the access address, and take a remainder for the quantity;

A target node determining unit, configured to determine the node corresponding to the remainder as the target node.

Optionally, the content distribution network CDN includes a central node, a parent layer node, and an edge node;

The central node communicates with the source website;

The parent layer nodes communicate with each other, communicate with the central node or the source website, and communicate with the edge node;

The edge node is used to communicate with the client;

Wherein, some of the parent layer nodes form a cluster, and/or, some of the edge nodes form a cluster.

In the embodiment of the present invention, the content distribution network has a plurality of nodes, and some nodes form a cluster, and the current node of the cluster receives the access request, assigns the target node for processing the access request in the cluster, and sends the target node to the target node through the preset connection. Send operation instructions to operate the access request and obtain the operation result, receive the operation result returned by the target node through the connection, and return the access result according to the operation result, and realize the cluster by forming a small-scale cluster of some nodes in the content distribution network The communication connection between internal nodes does not need to use multicast to communicate, which greatly improves the flexibility of communication.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the specific embodiments of the present invention are enumerated below.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same reference numerals are used to designate the same parts. In the attached picture:

FIG. 1 shows a schematic flow chart of the steps of an embodiment of a communication method based on a content distribution network CDN according to an embodiment of the present invention;

Fig. 2 shows a schematic structural diagram of a content distribution network CDN according to an embodiment of the present invention;

FIG. 3 shows a schematic flow chart of the steps of another embodiment of a communication method based on a content distribution network CDN according to an embodiment of the present invention; and

Fig. 4 shows a schematic block diagram of a communication device embodiment based on a CDN according to an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

Referring to FIG. 1 , it shows a schematic flowchart of the steps of an embodiment of a communication method based on a content distribution network CDN according to an embodiment of the present invention, which may specifically include the following steps:

Step 101, receiving an access request in the current node.

In the content distribution network CDN, there are usually multiple nodes for transmitting and caching data (such as live streams, cached data, etc.), and the data of the client and the source website (such as live streams, cached data, etc.) ), it can be pushed to other nodes, and when the user accesses data (such as live streaming, cached data, etc.), the user's request is routed or directed to the node closest to the user's access network or with the best access effect through scheduling. The node provides users with data (such as live streaming, cached data, etc.); compared with directly accessing the source website, this method shortens the network distance between the user and the data (such as live streaming, cached data, etc.), thereby achieving acceleration Effect.

It should be noted that, in different CDNs, the topological structures may be different.

In one embodiment, the multiple nodes of the CDN include a central node, a parent node, and an edge node.

In some cases, the central node is a resource super-convergence node, which can communicate with the source website and gather a large number of resources of the source website. These resources are generally less-changing resources, such as videos, pictures, and so on.

In some cases, the central node only saves file information, such as URL (Uniform Resource Locator, Uniform Resource Locator), size, etc., and does not directly cache the file. Other nodes in the content distribution network CDN obtain the pending The file information of the cached file is reported to the central node after the file is cached, and the central node counts the files cached by other nodes.

It should be noted that the central node can be deployed in some content distribution network CDN, that is, this part of the content distribution network CDN is a three-layer structure of central node-parent layer node-edge node, in some content distribution network CDN may not The deployment center node, that is, the part of the content distribution network CDN is a two-layer structure of parent layer node-edge node, which is not limited in the embodiment of the present invention.

The parent layer node is the sub-convergence node of resources. On the one hand, because in the content distribution network CDN, each node generally uses proprietary communication cables such as two-way optical fiber for communication, the communication quality between the central node and the parent layer node It has a high degree of guarantee. In the case of obtaining less-changing resources and poor communication quality of external source websites, it can communicate with the central node and obtain resources from the central node. On the other hand, when obtaining new resources and performing data In the case of operations (such as payment), etc., it is possible to communicate with the source website and obtain resources from the source website.

Furthermore, parent layer nodes can communicate with each other to form a transmission path between parent layer nodes and edge nodes, that is, a path composed of intermediate transmission nodes and communication cables from one node to another node.

Specifically, there are many ways to select the transmission path, and at least one of the following ways can be selected according to actual needs:

1. Select a transmission path whose transmission performance meets the set requirements.

Transmission performance refers to the transmission capability of the transmission path of the transmission stream data. The transmission performance of the transmission path can be determined according to the distance between nodes, transmission speed, data loss rate, and congestion status. By regularly updating the transmission performance between every two nodes, According to the transmission performance of each transmission path between nodes, select the transmission path whose transmission performance meets the requirements or has the best transmission performance.

2. Select the transmission path with the least number of passing nodes.

Select the transmission path with the least number of nodes among multiple transmission paths, so that the transmission of data from one node to another node can be completed by occupying the least transmission resources.

3. Select a transmission path that has not been selected for a period of time.

If there is streaming data transmitted from one node to another node in history, then when there is new data to be transmitted between the two, one of the transmission paths that has not been selected for a period of time can be selected to avoid Always selecting the same transmission path causes the nodes on the transmission path to be overloaded.

Certainly, the above-mentioned selection method of the transmission path is only an example. When implementing the embodiment of the present invention, other selection methods of the transmission path may be set according to the actual situation, which is not limited in the embodiment of the present invention. In addition, in addition to the above method of selecting the transmission path, those skilled in the art may also use other methods of selecting the transmission path according to actual needs, which is not limited in this embodiment of the present invention.

In addition, the parent node is generally deployed with multiple operators' computer rooms, and the computer rooms are connected by proprietary communication cables such as dual-wire optical cables. Edge nodes are generally deployed in a certain operator's network The computer room of the parent layer node can communicate with the edge node.

Edge nodes have the ability to communicate with each other, but generally, they do not communicate directly.

Edge nodes can access clients, such as mobile phones, tablet computers, TVs, etc., to communicate with clients, such as obtaining live streams collected by them, or pushing live streams to the client.

In order for those skilled in the art to better understand the embodiment of the present invention, the content delivery network CDN in the embodiment of the present invention is described below through specific examples.

As shown in Figure 2, the parent layer nodes are A1, A2, A3, and A4, which can be deployed according to geographical locations. For example, A1 is deployed in Beijing, A2 is deployed in Shanghai, A3 is deployed in Guangzhou, A4 is deployed in Zhengzhou, and A1 can be deployed with A2 communicates, A2 can communicate with A3, A3 can communicate with A4, A4 can communicate with A1, and the circular communication between parent layer nodes can form a ring-shaped parent layer structure.

In addition, each parent layer node can be connected to one or more edge nodes, and edge nodes can also be deployed according to factors such as geographic location and operators. Generally, edge nodes do not directly communicate with each other, but are transferred through parent layer nodes. Parent node A1 is connected to edge nodes A11 and A12, parent node A2 is connected to edge nodes A21 and A22, parent node A3 is connected to edge nodes A31, A32 and A33, and parent node A4 is connected to edge nodes A41, A42 and A43.

The edge node accesses the client, such as the edge node A32 accesses the client B1, and is used to receive data (such as a live stream) from the client, or send data (such as a live stream) to the client.

In the embodiment of the present invention, some nodes can form a cluster, and the nodes in the cluster can connect and communicate with each other.

In the content distribution network CDN mentioned above, some parent layer nodes may form a cluster, and/or, some edge nodes may form a cluster.

In addition, if the current node is an edge node, it can receive an access request from a client, and if the current node is a parent node, it can receive an access request from an edge node.

Step 102, allocating a target node to process the access request in the cluster.

In a specific implementation, the current node may select one of the nodes in the same cluster as the target node for processing the access request according to certain allocation rules.

It should be noted that the target node may be the current node or other nodes except the current node, which is not limited in this embodiment of the present invention.

In one embodiment of the present invention, step 102 may include the following sub-steps:

Sub-step S11, extracting the access address from the access request.

In a specific implementation, the access address of the resource to be accessed may be extracted from the access request, such as a URL (Uniform Resource Locator, Uniform Resource Locator).

Sub-step S12, determining online nodes in the cluster.

Due to node failure, poor network communication quality, etc., for the current node, there may be some nodes that cannot be contacted. For this part of nodes, they can be called offline nodes. On the contrary, other contactable nodes can be called offline nodes. It is an online node.

In a specific implementation, the current node can maintain an online node in the memory, therefore, the node identifier, such as node ID, host name, etc., can be searched in the memory, and the node corresponding to the node identifier can be determined to be an online node.

Sub-step S13, assigning a target node from the online nodes according to the access address.

After filtering out the online nodes in the cluster, the access address can be assigned to one of the online nodes as the target node.

In an example, the number of online nodes in the cluster may be counted, a hash value is calculated for the access address, a remainder is taken from the number, and the node corresponding to the remainder is determined to be the target node.

In this example, a complete access address (such as URL) is hashed key=HASH($URL)%N (N is the number of online nodes) to get a key value, and URLs with the same key value also That is, access requests will be sent to the same node, for example, key=0 is sent to the first online node, key=1 is sent to the second online node, and so on.

Of course, the above method of allocating target nodes is just an example. When implementing the embodiment of the present invention, other ways of allocating target nodes can be set according to actual conditions, such as random allocation, which is not limited in the embodiment of the present invention. In addition, in addition to the foregoing manner of allocating target nodes, those skilled in the art may also adopt other manners of allocating target nodes according to actual needs, which is not limited in this embodiment of the present invention.

Step 103, sending an operation instruction to the target node through the preset connection, so as to operate on the access request and obtain an operation result.

In the application of the embodiment of the present invention, a TCP (Transmission Control Protocol, transmission control protocol) connection may be established in advance between the nodes of the cluster.

The current node can generate operation instructions and send them to the target node through this connection.

The target node operates on the access request according to the operation instruction to generate operation results, such as directly extracting cached data from the target node locally, obtaining data through back-to-source operations, and so on.

Step 104, receiving the operation result returned by the target node through the connection.

The target node sends the operation result to the current node through the connection with the current node.

Step 105, returning an access result according to the operation result.

After the current node receives the operation result of the target node, it can generate an access result and respond to the access request.

In the above content distribution network CDN, if the current node is an edge node, the access result may be returned to the client; if the current node is a parent layer node, the access result may be returned to the edge node.

In the embodiment of the present invention, the content distribution network has a plurality of nodes, and some nodes form a cluster, and the current node of the cluster receives the access request, assigns the target node for processing the access request in the cluster, and sends the target node to the target node through the preset connection. Send operation instructions to operate the access request and obtain the operation result, receive the operation result returned by the target node through the connection, and return the access result according to the operation result, and realize the cluster by forming a small-scale cluster of some nodes in the content distribution network The communication connection between internal nodes does not need to use multicast to communicate, which greatly improves the flexibility of communication.

Referring to FIG. 3 , it shows a schematic flowchart of the steps of another embodiment of a communication method based on a content distribution network CDN according to an embodiment of the present invention, which may specifically include the following steps:

Step 301, searching for a preset configuration file.

In a specific implementation, the configuration file records the node identifiers of the nodes in the same cluster.

When adding a new node in the cluster, add the node ID of the new node in the configuration file.

When deleting the original node in the cluster, delete the node ID of the original node in the configuration file.

Step 302, loading the node identifier into memory.

The current node loads the node identifier in the configuration file into the memory to facilitate subsequent maintenance of the nodes in the cluster.

In step 303, the current node establishes a connection with the node corresponding to the node identifier through the transmission control protocol TCP.

In order to achieve reliable data transmission, TCP needs to establish a transmission connection between application processes. It establishes a logical connection between two transmission users, so that both communication parties can confirm that the other party is their own transmission connection endpoint.

Before establishing a connection, the node as the server first passively opens its well-known port and listens to the port. When a node as a client wants to establish a connection with a node as a server, it initiates a request to actively open a port (the port is generally a temporary port), and then enters a three-way handshake process.

The three-way handshake process:

1. The TCP of A sends a connection request message segment to B, the synchronization bit SYN in the header should be set to 1, and the sequence number x is selected, indicating that the sequence number of the first data byte when transmitting data is x (setting the initial segment Sequence number SEQ=x, eg SEQ=26500).

2. After B's TCP receives the connection request segment, if it agrees, it will send back an acknowledgment.

B should set SYN to 1 in the confirmation message segment, and its confirmation number ACK should be x+1 (ACK26 501), and also provide own selection sequence number y (setting initial segment sequence number SEQ=y, such as SEQ=29 010).

3. After receiving the message segment, A gives an acknowledgment to B, and the acknowledgment number should be y+1 (ACK=29011).

A's TCP notifies the upper layer application process that the connection has been established.

When the TCP of host B running the server process receives the confirmation from host A, it also notifies its upper layer application process that the connection has been established.

Since the client numbers segments, it knows which sequence numbers are expected and which are obsolete. When the client finds that the sequence number of the message segment is an outdated sequence number, it will reject the message segment, so as not to cause repeated connections.

After the data transmission is over, both communicating parties can release the connection.

Step 304, the current node sends heartbeat information to other nodes in the cluster through the connection.

Step 305, determine the status of other nodes in the cluster through the heartbeat information.

Step 306, when the status is online, keep the node identifiers of other nodes in the cluster in the memory.

Step 307, when the status is offline, delete the node IDs of other nodes in the cluster in the memory.

In the embodiment of the present invention, a heartbeat can be maintained between nodes in the cluster through a TCP connection, and the current node can actively detect other nodes in the cluster through the heartbeat.

If the heartbeat information of other nodes can be continuously received, the node can be considered to be online, and the node identity of the node is kept in memory.

If the heartbeat information of other nodes is not received after a period of time, the node can be considered offline, and the node ID of the node is deleted in memory.

For the method embodiment, for the sake of simple description, it is expressed as a series of action combinations, but those skilled in the art should know that the embodiment of the present invention is not limited by the described action order, because according to the embodiment of the present invention , certain steps may be performed in other order or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

Referring to FIG. 4 , it shows a schematic block diagram of a communication device embodiment based on a content distribution network CDN according to an embodiment of the present invention. There are multiple nodes in the content distribution network, and some nodes form a cluster, which may specifically include the following modules :

An access request receiving module 401, configured to receive an access request in the current node;

A target node allocation module 402, configured to allocate a target node for processing the access request in the cluster;

An operation instruction sending module 403, configured to send an operation instruction to the target node through a preset connection, so as to operate on the access request and obtain an operation result;

An operation result receiving module 404, configured to receive the operation result returned by the target node through the connection;

An access result returning module 405, configured to return an access result according to the operation result.

In one embodiment of the present invention, also include:

The configuration file search module is used to search for a preset configuration file, and the configuration file records the node identifier of the node in the cluster;

The node identification loading module is configured to load the node identification into memory.

In one embodiment of the present invention, also include:

A connection establishment module, configured to establish a connection with the node corresponding to the node identifier through the transmission control protocol TCP in the current node.

In one embodiment of the present invention, also include:

A heartbeat information sending module, configured to send heartbeat information to other nodes in the cluster through the connection in the current node;

A status determination module, configured to determine the status of other nodes in the cluster through the heartbeat information;

A node identification keeping module, configured to keep the node identifications of other nodes in the cluster in the memory when the status is online;

The node identifier deletion module is configured to delete the node identifiers of other nodes in the cluster in the memory when the status is offline.

In one embodiment of the present invention, also include:

A configuration file adding module, configured to add a node identifier of the new node in the configuration file when adding a new node in the cluster;

The configuration file deletion module is configured to delete the node identifier of the original node in the configuration file when the original node is deleted in the cluster.

In one embodiment of the present invention, the target node allocation module 402 includes:

An access address extraction submodule, configured to extract an access address from the access request;

An online node determining submodule, configured to determine online nodes in the cluster;

The online node allocation submodule is configured to allocate a target node from the online nodes according to the access address.

In one embodiment of the present invention, the online node determination submodule includes:

A memory search unit, configured to search for a node identifier in memory;

The node identifier determining unit is configured to determine that the node corresponding to the node identifier is an online node.

In one embodiment of the present invention, the online node allocation submodule includes:

A quantity statistics unit, used to count the number of online nodes in the cluster;

a hash remainder unit, configured to calculate a hash value for the access address, and take a remainder for the quantity;

A target node determining unit, configured to determine the node corresponding to the remainder as the target node.

In one embodiment of the present invention, the content distribution network CDN includes a central node, a parent layer node, and an edge node;

The central node communicates with the source website;

The parent layer nodes communicate with each other, communicate with the central node or the source website, and communicate with the edge node;

The edge node is used to communicate with the client;

Wherein, some of the parent layer nodes form a cluster, and/or, some of the edge nodes form a cluster.

As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for related parts, please refer to the part of the description of the method embodiment.

The algorithms and displays presented herein are not inherently related to any particular computer, virtual system, or other device. Various generic systems can also be used with the teachings based on this. The structure required to construct such a system is apparent from the above description. Furthermore, the present invention is not specific to any particular programming language. It should be understood that various programming languages can be used to implement the content of the present invention described herein, and the above description of specific languages is for disclosing the best mode of the present invention.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure the understanding of this description.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, in order to streamline this disclosure and to facilitate an understanding of one or more of the various inventive aspects, various features of the invention are sometimes grouped together in a single embodiment, figure, or its description. This method of disclosure, however, is not to be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the Detailed Description are hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment of this invention.

Those skilled in the art can understand that the modules in the device in the embodiment can be adaptively changed and arranged in one or more devices different from the embodiment. Modules or units or components in the embodiments may be combined into one module or unit or component, and furthermore may be divided into a plurality of sub-modules or sub-units or sub-assemblies. All features disclosed in this specification (including accompanying claims, abstract and drawings) and any method or method so disclosed may be used in any combination, except that at least some of such features and/or processes or units are mutually exclusive. All processes or units of equipment are combined. Each feature disclosed in this specification (including accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will understand that although some embodiments described herein include some features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the invention. and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.

The various component embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art should understand that a microprocessor or a digital signal processor (DSP) can be used in practice to implement some or all of some or all of the components in the communication device based on the content distribution network CDN according to the embodiment of the present invention Function. The present invention can also be implemented as an apparatus or an apparatus program (for example, a computer program and a computer program product) for performing a part or all of the methods described herein. Such a program for realizing the present invention may be stored on a computer-readable medium, or may be in the form of one or more signals. Such a signal may be downloaded from an Internet site, or provided on a carrier signal, or provided in any other form.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means can be embodied by one and the same item of hardware. The use of the words first, second, and third, etc. does not indicate any order. These words can be interpreted as names.

The embodiment of the present invention discloses A1, a communication method based on a content distribution network CDN. There are multiple nodes in the content distribution network, and some nodes form a cluster, including:

Receive an access request in the current node;

Allocating a target node for processing the access request in the cluster;

sending an operation instruction to the target node through a preset connection to operate on the access request and obtain an operation result;

receiving the operation result returned by the target node through the connection;

The access result is returned according to the operation result.

A2, the method as described in A1, also includes:

Find a preset configuration file, the configuration file records the node identifier of the node in the cluster;

Load the node ID into memory.

A3, the method as described in A2, also includes:

In the current node, a connection is established with the node corresponding to the node identifier through the transmission control protocol TCP.

A4, the method as described in A3, also includes:

sending heartbeat information to other nodes in the cluster through the connection in the current node;

Determine the status of other nodes in the cluster through the heartbeat information;

When the state is online, keep the node identifiers of other nodes in the cluster in the memory;

When the state is offline, delete the node identifiers of other nodes in the cluster in the memory.

A5, the method as described in A2, also includes:

When adding a new node in the cluster, add the node identifier of the new node in the configuration file;

When deleting an original node in the cluster, delete the node identifier of the original node in the configuration file.

A6. The method according to any one of A1-A5, the allocating the target node for processing the access request in the cluster includes:

Extracting an access address from the access request;

determining the online nodes in the cluster;

A target node is assigned from among the online nodes according to the access address.

A7. The method as described in A6, the determination of online nodes in the cluster includes:

Look up the node ID in memory;

It is determined that the node corresponding to the node identifier is an online node.

A8. The method as described in A6, the allocation of the target node from the online nodes according to the access address, including:

Count the number of online nodes in the cluster;

calculating a hash value for the access address, and taking the remainder of the quantity;

The node corresponding to the remainder is determined as the target node.

A9. The method according to any one of A1-A5, wherein the content distribution network CDN includes a central node, a parent layer node, and an edge node;

The central node communicates with the source website;

The parent layer nodes communicate with each other, communicate with the central node or the source website, and communicate with the edge node;

The edge node is used to communicate with the client;

Wherein, some of the parent layer nodes form a cluster, and/or, some of the edge nodes form a cluster.

The embodiment of the present invention also discloses B10, a communication device based on content distribution network CDN, which has multiple nodes in the content distribution network, and some nodes form a cluster, including:

An access request receiving module, configured to receive an access request in the current node;

a target node allocation module, configured to allocate a target node for processing the access request in the cluster;

An operation instruction sending module, configured to send an operation instruction to the target node through a preset connection, so as to operate on the access request and obtain an operation result;

An operation result receiving module, configured to receive the operation result returned by the target node through the connection;

An access result returning module, configured to return an access result according to the operation result.

B11. The device as described in B10, further comprising:

The configuration file search module is used to search for a preset configuration file, and the configuration file records the node identifier of the node in the cluster;

The node identification loading module is configured to load the node identification into memory.

B12. The device as described in B11, further comprising:

A connection establishment module, configured to establish a connection with the node corresponding to the node identifier through the transmission control protocol TCP in the current node.

B13. The device as described in B12, further comprising:

A heartbeat information sending module, configured to send heartbeat information to other nodes in the cluster through the connection in the current node;

A status determination module, configured to determine the status of other nodes in the cluster through the heartbeat information;

A node identification keeping module, configured to keep the node identifications of other nodes in the cluster in the memory when the status is online;

The node identifier deletion module is configured to delete the node identifiers of other nodes in the cluster in the memory when the status is offline.

B14. The device as described in B11, further comprising:

A configuration file adding module, configured to add a node identifier of the new node in the configuration file when adding a new node in the cluster;

The configuration file deletion module is configured to delete the node identifier of the original node in the configuration file when the original node is deleted in the cluster.

B15. The device according to any one of B10-B14, the target node allocation module includes:

An access address extraction submodule, configured to extract an access address from the access request;

An online node determining submodule, configured to determine online nodes in the cluster;

The online node allocation submodule is configured to allocate a target node from the online nodes according to the access address.

B16, the device as described in B15, the online node determination submodule includes:

A memory search unit, configured to search for a node identifier in memory;

The node identifier determining unit is configured to determine that the node corresponding to the node identifier is an online node.

B17. The device as described in B15, the online node allocation submodule includes:

A quantity statistics unit, used to count the number of online nodes in the cluster;

a hash remainder unit, configured to calculate a hash value for the access address, and take a remainder for the quantity;

A target node determining unit, configured to determine the node corresponding to the remainder as the target node.

B18. The device according to any one of B10-B14, wherein the content distribution network CDN includes a central node, a parent layer node, and an edge node;

The central node communicates with the source website;

The parent layer nodes communicate with each other, communicate with the central node or the source website, and communicate with the edge node;

The edge node is used to communicate with the client;

Wherein, some of the parent layer nodes form a cluster, and/or, some of the edge nodes form a cluster.

Claims (10)

1. a kind of communication means based on content distributing network CDN has multiple nodes, part of nodes group in content distributing network Into cluster, including：

Access request is received in present node；

The destination node of access request described in allocation processing in the cluster；

Operational order is sent by default connect to the destination node, to be operated to the access request, and is obtained Operating result；

The operating result of the destination node return is received by the connection；

According to the operating result backward reference result.

2. the method as described in claim 1, which is characterized in that further include：

Default configuration file is searched, the configuration file is documented in the node identification of the cluster interior joint；

The node identification is loaded onto in memory.

3. method as claimed in claim 2, which is characterized in that further include：

Connection is established by transmission control protocol TCP node corresponding with the node identification in present node.

4. method as claimed in claim 3, which is characterized in that further include：

In present node heartbeat message is sent by described other nodes connected into the cluster；

The state of other nodes in the cluster is determined by the heartbeat message；

When the state is online, node identification of other nodes in the memory in the cluster is kept；

When the state is offline, node identification of other nodes in the memory in the cluster is deleted.

5. method as claimed in claim 2, which is characterized in that further include：

When increasing new node in the cluster, increase the node identification of the new node in the configuration file；

When deleting original node in the cluster, the node mark of original node is deleted in the configuration file Know.

6. such as claim 1-5 any one of them methods, which is characterized in that the visit described in allocation processing in the cluster Ask the destination node of request, including：

Access address is extracted from the access request；

Determine node online in the cluster；

Destination node will be distributed according to the access address from the online node.

7. method as claimed in claim 6, which is characterized in that it is described to determine node online in the cluster, including：

Node identification is searched in memory；

It is online node to determine the corresponding node of the node identification.

8. method as claimed in claim 6, which is characterized in that it is described will be from the online node according to the access address Middle distribution destination node, including：

Count the quantity of node online in the cluster；

Cryptographic Hash is calculated to the access address, and the quantity is taken the remainder；

It is destination node to determine the corresponding node of the remainder.

9. such as claim 1-5 any one of them methods, which is characterized in that the content distributing network CDN includes centromere Point, father's node layer, fringe node；

The Centroid communicates with source website；

The intercommunication of father's node layer, communicate with the Centroid or source website and, with the edge Node communicates；

The fringe node is used to communicate with client；

Wherein, part father's node layer composition cluster and/or, the part fringe node composition cluster.

10. a kind of communicator based on content distributing network CDN has multiple nodes, part of nodes in content distributing network Cluster is formed, including：

Access request receiving module, for receiving access request in present node；

Destination node distribution module, for the destination node of access request described in the allocation processing in the cluster；

Operational order sending module sends operational order, with to the visit for passing through default connect to the destination node It asks that request is operated, and obtains operating result；

Operating result receiving module, for passing through the operating result that the connection receives the destination node and returns；

Result return module is accessed, for according to the operating result backward reference result.