CN108337274A - A kind of message distributing method and system - Google Patents
A kind of message distributing method and system Download PDFInfo
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- CN108337274A CN108337274A CN201710038638.8A CN201710038638A CN108337274A CN 108337274 A CN108337274 A CN 108337274A CN 201710038638 A CN201710038638 A CN 201710038638A CN 108337274 A CN108337274 A CN 108337274A
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- server
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- central schedule
- network connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
- H04L67/63—Routing a service request depending on the request content or context
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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Abstract
The invention discloses a kind of message distributing method and systems.This method includes：Central schedule server receives message distribution information；For the central schedule server according to the message distribution information, the node server for including to the message distribution information sends message；Detect the network connection state between the central schedule server and each node server, if the network connection between the central schedule server and a node server is abnormal, network connection normally other one or more node servers are then selected, and other node servers send the instruction to the node server of network connection exception forwarding message to the one or more.This method and system improve the distribution speed of message；Avoid packet loss phenomenon when network connection state exception between central schedule server and node server.
Description
Technical field
The present invention relates to network field more particularly to a kind of message distributing method and systems.
Background technology
When carrying out the distribution of message by server, the single publisher node of generally use carries out message distribution, distribution effect
Rate is relatively low.Especially when network connection state exception, dispatch server may constantly attempt dispatch messages, expend a large amount of
Time, but may finally message distribution can not also be gone down due to network connection.
The prior art has the disadvantage that：
(1) one-site model distribution efficiency is low, poor reliability；
(2) when exception occurs in the network between node and center piping server, it is possible to not receive message.
Therefore, it is necessary to a kind of method and systems for capableing of fast and efficiently dispatch messages.
Invention content
In order to solve the problems in the existing technology, it provides a kind of message distributing method and system, this method and is
System being capable of fast and efficiently dispatch messages.
According to an aspect of the invention, there is provided a kind of message distributing method, the method includes：
Central schedule server receives message distribution information；
The central schedule server is according to the message distribution information, the node that includes to the message distribution information
Server sends message；
The network connection state between the central schedule server and each node server is detected, if the center
Network connection between dispatch server and a node server is abnormal, then select network connection normally it is one or more other
Node server, and other node servers are sent to the forwarding of the node server of network connection exception to the one or more
The instruction of message.
Wherein, central schedule server selection network connection normally other one or more node servers when,
Select other one or more node servers that there is identical message to be received with the node server.
Wherein, central schedule server selection network connection normally other one or more node servers when,
It is selected according to one or more of following principles：Wait for the node server of selection and the node serve that message is forwarded to it
Device belongs to same computer room, either belongs to same region and either belongs to same node or belong to same operator.
Wherein, the central schedule server detects the net between the central schedule server and each node server
Network connection status includes：
Whether the central schedule server is inquired periodically receives the detection packet that each node server is sent, wherein institute
The polling cycle for stating central schedule server is more than the sending cycle of the node server；
If the query result for a node server is not receive detection packet, meet one or two in following conditions
Judge whether to receive the message received state that the node server is sent in the case of a：The central schedule server transmission disappears
Message received state is received by the period of setting, from every other node server after breath, if judging result is that do not have
The message received state for receiving node server transmission, then judge between the central schedule server and the node server
Network connection it is abnormal.
Wherein, the central schedule server and the node server are the nodes in CDN network.
According to another aspect of the present invention, a kind of message distributing method is additionally provided, the method includes：
Node server receives the message of central schedule server distribution；
Wherein, when the network connection exception between the central schedule server and the node server, the node
By the network connection between the central schedule server, normally other one or more node servers connect server
Receive the message of the central schedule server distribution.
Wherein, the method further includes：
The node server is received to the central schedule server network from the central schedule server and is connect
The instruction of abnormal node server forwarding message, and according to the instruction, connect to the central schedule server network
Abnormal node server forwards the message.
Wherein, the method further includes：
It is executed before the message that the node server receives the distribution of central schedule server：Periodically to the center
Dispatch server sends detection packet, and sending cycle is less than whether central schedule server inquiry receives looking into for the detection packet
Ask the period；
It is executed after the message that the node server receives the distribution of central schedule server：It is taken to the central schedule
Business device sends message received state.
Wherein, the node server sends detection packet using multiple transport protocols to the central schedule server.
Wherein, the central schedule server and the node server are the nodes in CDN network.
According to another aspect of the present invention, a kind of message distributing system is additionally provided, the message distributing system is in center
It is realized on dispatch server, the system comprises：
Receiving module receives message distribution information；
First sending module, the node for according to the message distribution information, including to the message distribution information
Server sends message；
Detection module is adjusted for after first sending module sends message to node server, detecting the center
Spend the network connection state between server and each node server；
Server se-lection module detects the central schedule server and a node serve for working as the detection module
Network connection between device is abnormal, selects network connection normally other one or more node servers；
Second sending module sends the section to network connection exception for other node servers to the one or more
Point server forwards the instruction of message.
Wherein, the server se-lection module is additionally operable to：Select network connection normally one or more other nodes clothes
When business device, selects and the node server has other node servers of the one or more of identical message to be received.
Wherein, the server se-lection module is additionally operable to, and is selected according to one or more of following principles：It is to be selected
The node server selected forwards the node server of message to belong to same computer room with to it, either belongs to same region or belongs to same
Node, or belong to same operator.
Wherein, the detection module is additionally operable to：
It inquires periodically and whether receives the detection packet that each node server is sent, wherein polling cycle is more than the node
The sending cycle of server；
If the query result for a node server is not receive detection packet, meet one or two in following conditions
Judge whether to receive the message received state that the node server is sent in the case of a：First sending module sends message
Message received state is received by the period of setting, from every other node server afterwards, if judging result is not receive
The message received state sent to the node server, then judge between the central schedule server and the node server
Network connection is abnormal.
Wherein, the central schedule server and the node server are the nodes in CDN network.
According to another aspect of the present invention, a kind of message distributing system is additionally provided, the message distributing system is in node
It is realized on server, the system comprises：
First receiving module, the message for receiving the distribution of central schedule server,
Second receiving module, for when the network connection exception between the central schedule server and the node server
When, by the network connection between the central schedule server, normally other one or more node servers receive institute
State the message of central schedule server distribution.
Wherein, first receiving module is additionally operable to receive to the central schedule from the central schedule server and take
The instruction of the node server forwarding message for device network connection exception of being engaged in；
The system also includes：
First sending module is used for according to the instruction, to the section for connecting exception with the central schedule server network
Point server forwards the message.
Wherein, the system also includes：
Second sending module is used for before the message that first receiving module receives the distribution of central schedule server,
Detection packet is sent to the central schedule server periodically, sending cycle is less than whether central schedule server inquiry receives
To the polling cycle of the detection packet；And first receiving module receive central schedule server distribution message it
Afterwards, message received state is sent to the central schedule server.
Wherein, second sending module is additionally operable to be sent to the central schedule server using multiple transport protocols and be visited
Survey packet.
Wherein, the central schedule server and the node server are the nodes in CDN network.
In message distributing method and system in the present invention, when to node server dispatch messages, when central schedule takes
When the network connection state exception between device and node server of being engaged in, disappeared by the normal node server forwarding of network state
Breath, and network connection state detection is carried out by bi-directionally sent message between central schedule server and node server.Tool
There is following advantageous effect：
(1) network transmission of system has with responding ability is significantly promoted, and improves the distribution speed of message；
(2) packet loss phenomenon when network connection state exception between central schedule server and node server is avoided.
Description of the drawings
The attached drawing for constituting the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of the message distributing method according to the present invention executed by central schedule server；
Fig. 2 is the flow chart of the message distributing method according to the present invention executed by node server；
Fig. 3 is the schematic diagram of the specific embodiment of message distributing method according to the present invention；
Fig. 4 is the schematic diagram of the message distributing system according to the present invention realized on central schedule server；
Fig. 5 is the schematic diagram of the message distributing system according to the present invention realized on node server.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.It needs
Illustrate, in the absence of conflict, the features in the embodiments and the embodiments of the present application mutually can be combined arbitrarily.
The present invention provides a kind of message distributing method, this method is executed by central schedule server.As shown in Figure 1, should
Method includes：
Step 101, central schedule server receives message distribution information；
Step 102, central schedule server is according to message distribution information, the node serve for including to message distribution information
Device sends message；
Step 103, the network connection state between central schedule server and each node server is detected, if central
Network connection between dispatch server and a node server is abnormal, then select network connection normally it is one or more other
Node server, and other node servers are sent to the forwarding of the node server of network connection exception to the one or more
The instruction of message.
In step 103, central schedule server select network connection normally other one or more node servers when,
Select other one or more node servers that there is identical message to be received with the node server.When central schedule takes
When business device selection has other one or more node servers of identical message to be received with the node server, sending
Forwarding message instruction in, then need not include to need the specific message that forward.But if central schedule server selects
The node server of node server and network connection exception there is no identical message to be received, then the forwarding message sent
Instruction in, need include specific message to be forwarded.
And central schedule server select network connection normally other one or more node servers when, under
One or more of principle is stated to be selected：Wait for that the node server of selection forwards the node server of message to belong to it
Same computer room either belongs to same region and either belongs to same node or belong to same operator.
Network connection shape between central schedule server detection central schedule server and each node server herein
State includes：Whether central schedule server is inquired periodically receives the detection packet that each node server is sent, wherein center is adjusted
The polling cycle for spending server is more than the sending cycle of node server；If the query result for a node server is that do not have
Detection packet is received, then judges whether to receive disappearing for node server transmission in the case where following conditions meet one or two
Message receiving state：Central schedule server sends after message period by setting, is received from every other node server
Judge center if judging result is not receive the message received state of node server transmission to message received state
Network connection between dispatch server and the node server is abnormal.
The polling cycle of central schedule server is more than node server and sends the sending cycle of detection packet, rather than is equal to
Sending cycle is to prevent network connection state from judging situation by accident in order to following：Between central schedule server and node server
Network connection is normal, but occur packet drop due to network and so that central schedule server is not received by node
The detection packet that server is sent.In order to prevent this situation, polling cycle is generally equal to several times of sending cycle.Such as send week
Phase is 10 minutes, and polling cycle is 30 minutes.
It should be noted that the above method can be realized in CDN network, i.e. central schedule server and node server
For the node in CDN network.
The present invention also provides a kind of message distributing method, this method is executed by node server.As shown in Fig. 2, the party
Method includes：
Step 201, node server receives the message of central schedule server distribution；When central dispatch server and the section
When network connection exception between point server, node server is normal by the network connection between central schedule server
Other one or more node servers receive the message of central schedule servers distribution.
The above method further includes：Node server, which is received from central dispatch server to central schedule server network, to be connected
The instruction of abnormal node server forwarding message is connect, and according to the instruction, it is different to being connect with central schedule server network
Normal node server forwards the message.The operation is when the network between a node server and central schedule server connects
When connecing abnormal, central schedule server selects above-mentioned node server to disappear to the forwarding of the node server of network connection exception
Breath.Above-mentioned node server can have identical message to be received with the node server of network connection exception, can also have
There are different message to be received.When message to be received is identical, then need not be received from central dispatch server to be forwarded
Specific message；When message difference to be received, then need to receive specific message to be forwarded from central dispatch server.
When node server forwards message to other node servers, select Optimization route to this its according to routing policy
He forwards message by node server.
In addition, this method further includes：It is executed before the message that node server receives the distribution of central schedule server：Week
Detection packet is sent to phase to central schedule server, it is described whether sending cycle receives less than central schedule server inquiry
Detect the polling cycle of packet；It is executed after the message that node server receives the distribution of central schedule server：To central schedule
Server sends message received state.Here it sends detection packet and is easy for central schedule server elder generation's preliminary search and node clothes
Connection status between business device；It sends message received state and is easy for central schedule server determining and node server again
Between connection status.This detection packet that first sends retransmits message received state, and is confirmed by central schedule server tide
The mechanism of connection status ensure that the connection status between accurate judgement central schedule server and node server.In this way, working as
When network connection exception between central schedule server and node server, can sound quickly be made by central schedule server
It answers, i.e., from connecting other normal node servers with central schedule server network to the node serve of network connection exception
Device forwards message, ensure that message can fast and efficiently be distributed to each stage server.
The mode of multi-protocol transmission may be used when sending detection packet to central schedule server in node server, with
And the mode of channel transmission, so that central schedule server detects accuracy rate higher.It may be used when for example, sending detection packet
Udp protocol adds the mode of proprietary protocol, and when preventing with single-protocol transmission mode, central schedule server does not receive detection
Packet.Wherein, proprietary protocol refers to the agreement arranged between node server and central schedule server.
It should be noted that the above method can be realized in CDN network, i.e. central schedule server and node server
For the node in CDN network.
Below in conjunction with the accompanying drawings, the embodiment of message distributing method according to the present invention is described in detail.The message distributing method
System as shown in Figure 3 executes.The system includes an at least central schedule server, and such as 1000 are equipped with and disappear
Cease the node server of distribution customer terminal.Also, above-mentioned center dispatch server and node server are the section in CDN network
Point.
Each server is described as follows：
Central schedule server is used for：(1) message distribution task and dispatch messages are received；(2) each node server is collected
The message received state reported；
Node server is used for：(1) detection packet is sent to central schedule server periodically；(2) to central schedule service
Device reporting message reception state；(3) message is forwarded to other node servers.
Detailed process is as follows：
Step S1：The title of message, size, node server list are packaged into message distribution information and are sent to central tune
Spend server；
Step S2：Central schedule server parses the message distribution information, sends a message to each node serve
Device；
In this step, central schedule server detects itself and node server after sending message to node server
Between connection status.For example, central schedule server detects itself and the node server N1 in small carrier network
Between network connection it is abnormal, then random selection and the normal node server of network connection between it, such as node server
N100, N200, N300 indicate that these node servers chosen forward message to node server N1.In it should be noted that
Centre dispatch server can select to wait for difference with node server N1 when selection is forwarded the node server of message
The node server for receiving message, can also select the node server with identical message to be received.In addition, central schedule takes
Business device selects the node server of progress message forwarding according to following preference strategy：Preferably belong to same computer room, same to region, same
Node, the node server with operator；Then selection belong to cross operator, higher level operator node server.When
So, central schedule server can also randomly choose the node server for carrying out message forwarding.That is, selecting to node
When the node server of server N1 forwarding message, selected according to above-mentioned strategy.
In addition, central schedule server, which detects its connection status between node server, can be used following specific sides
Case：Node server presses some cycles, and such as 10 minutes primary, and detection packet is sent out to central schedule server.Send detection Bao Shike
In a manner of adding proprietary protocol using udp protocol, this is because in the case where some servers prohibit UDP or TCP, use is this
The mode of the double agreement transmission of multichannel, detects accuracy rate higher.Central schedule server presses some cycles, such as small every half
When, whether inquiry receives the detection packet of node server transmission.Here, the polling cycle of central schedule server takes more than node
Business device sends the sending cycle of detection packet.When central dispatch server sends repeatedly detection packet, such as 3 times in node server
Afterwards, still without the detection packet for receiving node server N1 transmissions, then decision node server N1 is seemingly-dead (for example, by its state
Code is set to -1).Central schedule server has received after sending message to each node server from every other node server
Any response bag (such as message received state), but receive any response bag (such as message sink still without from node server N1
State), and the scanning of central schedule server to node server N1 conditional codes is -1, be judged as it is very dead, i.e., and node serve
Network connection between device N1 is abnormal.In the above situation, when central schedule server does not reach setting after sending message
Between section, that is, judge that the network connection between node server N1 is abnormal, naturally it is also possible to wait set period of time to be achieved, not have still
Have from node server N1 and receive message received state, then judges that the network connection with it is abnormal.Above-mentioned judgement central schedule clothes
The mode of network connection state between business device and node server improves the accurate of judgement by the way of two-way judgement
Property.
The present invention also provides a kind of message distributing system, which realizes on central schedule server, such as Fig. 4 institutes
Show, which includes：
Receiving module 401 receives message distribution information；
First sending module 402, the node server for according to message distribution information, including to message distribution information
Send message；
Detection module 403, for after the first sending module sends message to node server, detecting central schedule service
Network connection state between device and each node server；
Server se-lection module 404 detects central schedule server and a node server for working as detection module 403
Between network connection it is abnormal, select network connection normally other one or more node servers；
Second sending module 405 is sent for other node servers to the one or more to network connection exception
Node server forwarding message instruction.
Server se-lection module 404 is additionally operable to：Select network connection normally other one or more node servers when,
Select other one or more node servers that there is identical message to be received with the node server.
Server se-lection module 404 is additionally operable to, and is selected according to one or more of following principles：Wait for the section of selection
Point server forwards the node server of message to belong to same computer room with to it, either belongs to same region or belongs to same node, or
Person belongs to same operator.
Detection module 403 is additionally operable to：
It inquires periodically and whether receives the detection packet that each node server is sent, wherein polling cycle is more than node serve
The sending cycle of device；
If the query result for a node server is not receive detection packet, meet one or two in following conditions
Judge whether to receive the message received state that the node server is sent in the case of a：First sending module 402 sends message
Message received state is received by the period of setting, from every other node server afterwards, if judging result is not receive
The message received state sent to the node server, then judge the network between central schedule server and the node server
Connection is abnormal.
Central schedule server and node server are the nodes in CDN network.
The present invention also provides a kind of message distributing system, which realizes on node server, as shown in figure 5, should
System includes：
First receiving module 501, the message for receiving the distribution of central schedule server,
Second receiving module 502, for when the network connection exception between central dispatch server and the node server
When, by the network connection between central schedule server, normally other one or more node servers receive center tune
Spend the message of server distribution.
First receiving module 501 is additionally operable to receive from central dispatch server different to being connect with central schedule server network
The instruction of normal node server forwarding message；
The system also includes：
First sending module, for according to the instruction, being taken to abnormal node is connect with central schedule server network
Business device forwards the message.
The system also includes：
Second sending module is used for before the message that the first receiving module receives the distribution of central schedule server, the period
Ground sends detection packet to central schedule server, and sending cycle is less than whether central schedule server inquiry receives the spy
Survey the polling cycle of packet；And it after the message that the first receiving module receives the distribution of central schedule server, is adjusted to center
It spends server and sends message received state.
Second sending module is additionally operable to send detection packet to the central schedule server using multiple transport protocols.
Central schedule server and node server are the nodes in CDN network.
In message distributing method and system in the present invention, when to node server dispatch messages, when central schedule takes
When the network connection state exception between device and node server of being engaged in, disappeared by the normal node server forwarding of network state
Breath, and network connection state detection is carried out by bi-directionally sent message between central schedule server and node server.Tool
There is following advantageous effect：
(1) network transmission of system has with responding ability is significantly promoted, and improves the distribution speed of message；
(2) packet loss phenomenon when network connection state exception between central schedule server and node server is avoided.
Descriptions above can combine implementation individually or in various ways, and these variants all exist
Within protection scope of the present invention.
It should be noted that herein, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that article or equipment including a series of elements include not only those elements, but also includes not having
There is the other element being expressly recited, or further includes for this article or the intrinsic element of equipment.Do not limiting more
In the case of system, the element that is limited by sentence " including ... ", it is not excluded that including the element article or equipment in
There is also other identical elements.
The above examples are only used to illustrate the technical scheme of the present invention and are not limiting, reference only to preferred embodiment to this hair
It is bright to be described in detail.It will be understood by those of ordinary skill in the art that can modify to technical scheme of the present invention
Or equivalent replacement should all cover the claim model in the present invention without departing from the spirit of the technical scheme of the invention and range
In enclosing.
Claims (20)
1. a kind of message distributing method, which is characterized in that the method includes：
Central schedule server receives message distribution information；
The central schedule server is according to the message distribution information, the node serve that includes to the message distribution information
Device sends message；
The network connection state between the central schedule server and each node server is detected, if the central schedule
Network connection between server and a node server is abnormal, then selects network connection normally other one or more nodes
Server, and other node servers are sent to the node server of network connection exception forwarding message to the one or more
Instruction.
2. the method as described in claim 1, which is characterized in that
Central schedule server selection network connection normally other one or more node servers when, selection and the section
Point server has other one or more node servers of identical message to be received.
3. method as claimed in claim 1 or 2, which is characterized in that
Central schedule server selection network connection normally other one or more node servers when, according to following originals
One or more of then selected：Wait for that the node server of selection forwards the node server of message to belong to same machine with to it
Room either belongs to same region and either belongs to same node or belong to same operator.
4. the method as described in claim 1, which is characterized in that the central schedule server detects the central schedule service
Network connection state between device and each node server includes：
Whether the central schedule server is inquired periodically receives the detection packet that each node server is sent, wherein in described
The polling cycle of dispatch server is entreated to be more than the sending cycle of the node server；
If the query result for a node server is not receive detection packet, meet one or two in following conditions
In the case of judge whether to receive the message received state of node server transmission：After the central schedule server sends message
Period by setting receives message received state from every other node server, if judging result is not receive
The message received state that the node server is sent, then judge the net between the central schedule server and the node server
Network connection is abnormal.
5. the method as described in claim 1, which is characterized in that the central schedule server and the node server are
Node in CDN network.
6. a kind of message distributing method, which is characterized in that the method includes：
Node server receives the message of central schedule server distribution；
Wherein, when the network connection exception between the central schedule server and the node server, the node serve
By the network connection between the central schedule server, normally other one or more node servers receive institute to device
State the message of central schedule server distribution.
7. method as claimed in claim 6, which is characterized in that the method further includes：
The node server receives abnormal to being connect with the central schedule server network from the central schedule server
Node server forwarding message instruction, and according to the instruction, to connect with the central schedule server network extremely
Node server forward the message.
8. method as claimed in claim 6, which is characterized in that the method further includes：
It is executed before the message that the node server receives the distribution of central schedule server：Periodically to the central schedule
Server sends detection packet, and sending cycle is less than the inquiry week whether central schedule server inquiry receives the detection packet
Phase；
It is executed after the message that the node server receives the distribution of central schedule server：To the central schedule server
Send message received state.
9. method as claimed in claim 8, which is characterized in that
The node server sends detection packet using multiple transport protocols to the central schedule server.
10. method as claimed in claim 6, which is characterized in that the central schedule server and the node server are
Node in CDN network.
11. a kind of message distributing system, which is characterized in that the message distributing system realizes on central schedule server, institute
The system of stating includes：
Receiving module receives message distribution information；
First sending module, the node serve for according to the message distribution information, including to the message distribution information
Device sends message；
Detection module, for after first sending module sends message to node server, detecting the central schedule clothes
The network connection state being engaged between device and each node server；
Server se-lection module, for work as the detection module detect the central schedule server and a node server it
Between network connection it is abnormal, select network connection normally other one or more node servers；
Second sending module is sent for other node servers to the one or more to the node of network connection exception clothes
The instruction for device forwarding message of being engaged in.
12. system as claimed in claim 11, which is characterized in that
The server se-lection module is additionally operable to：Select network connection normally other one or more node servers when, choosing
Select other one or more node servers that there is identical message to be received with the node server.
13. the system as described in claim 11 or 12, which is characterized in that
The server se-lection module is additionally operable to, and is selected according to one or more of following principles：Wait for the node of selection
Server with to its forward message node server belong to same computer room, either belong to same region either belong to same node or
Belong to same operator.
14. system as claimed in claim 11, which is characterized in that the detection module is additionally operable to：
It inquires periodically and whether receives the detection packet that each node server is sent, wherein polling cycle is more than the node serve
The sending cycle of device；
If the query result for a node server is not receive detection packet, meet one or two in following conditions
In the case of judge whether to receive the message received state of node server transmission：First sending module passes through after sending message
It spends the period of setting, receive message received state from every other node server, if judging result is not receive this
The message received state that node server is sent, then judge the network between the central schedule server and the node server
Connection is abnormal.
15. method as claimed in claim 11, which is characterized in that the central schedule server and the node server are
Node in CDN network.
16. a kind of message distributing system, which is characterized in that the message distributing system realizes on node server, the system
System includes：
First receiving module, the message for receiving the distribution of central schedule server,
Second receiving module is used for when the network connection exception between the central schedule server and the node server,
Described in the network connection between the central schedule server normally one or more other node servers receptions
The message of central schedule server distribution.
17. system as claimed in claim 16, which is characterized in that
First receiving module be additionally operable to from the central schedule server receive to the central schedule server network
The instruction of the abnormal node server forwarding message of connection；
The system also includes：
First sending module, for according to the instruction, being taken to abnormal node is connect with the central schedule server network
Business device forwards the message.
18. system as claimed in claim 16, which is characterized in that the system also includes：
Second sending module is used for before the message that first receiving module receives the distribution of central schedule server, the period
Ground sends detection packet to the central schedule server, and sending cycle is less than whether central schedule server inquiry receives institute
State the polling cycle of detection packet；And after the message in first receiving module reception central schedule server distribution,
Message received state is sent to the central schedule server.
19. method as claimed in claim 18, which is characterized in that
Second sending module is additionally operable to send detection packet to the central schedule server using multiple transport protocols.
20. the method described in claim 16, which is characterized in that the central schedule server and the node server are
Node in CDN network.
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