CN114448871A - Data feedback routing method and system for CDN - Google Patents
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Abstract
The invention discloses a data feedback routing method and a data feedback routing system for a CDN (content delivery network), wherein the method comprises the following steps of: the gateway receives a user request, and inquires an optimal link corresponding to the user request so as to return to a source through the optimal link request; if the back source failure continuously exceeds the specified times, feeding back the failed path IP to a detection application program so as to update the failure feedback times of the path IP through the detection application program; the detection application program adjusts the detection period of the optimal link according to the updated failure feedback times, and adds the optimal link to a source path to be selected back according to the detection result of the optimal link after the detection period comes; and if the optimal link is selected again and the source return is successful, clearing the failure feedback times of the path IP. The technical scheme provided by the application can avoid the problem of frequent retry switching of other back-source links caused by access failure.
Description
Technical Field
The invention relates to the technical field of internet, in particular to a data feedback routing method and system for a CDN (content delivery network).
Background
In order to achieve an optimal back-source acceleration effect, the CDN dynamic acceleration usually deploys a transit node resource for an acceleration client, and then actively initiates a periodic detection request to detect Network performance of a CDN transit node and a source station to select an optimal back-source path.
However, there is a problem with such periodic probe request initiation: once network congestion, network fluctuation or detected target downtime and other problems occur in a detection period, a detection initiator cannot sense the sudden network problems, and the situation can cause the problems of slow access and even access failure of a client within a period of time. Once access fails, it is conventional to perform a failed retry to switch to another accessible link. However, if the handover is frequently retried due to the unstable performance of the source station or the transit node and the unstable network transmission, the CDN acceleration experience of the customer may be affected, and especially the sensitive customer of the payment transaction class may not be allowed.
Disclosure of Invention
In view of this, embodiments of the present invention provide a data feedback routing method and system for a CDN, which can avoid the problem of frequent retry switching of other back-to-source links due to access failure.
One aspect of the present invention provides a data feedback routing method for a CDN, where the method includes: a gateway receives a user request, and inquires an optimal link corresponding to the user request so as to request a source through the optimal link; if the back source failure continuously exceeds the specified times, feeding back the failed path IP to a detection application program so as to update the failure feedback times of the path IP through the detection application program; the detection application program adjusts the detection period of the optimal link according to the updated failure feedback times, and adds the optimal link to a source path to be selected back according to the detection result of the optimal link after the detection period comes; and if the optimal link is selected again and the source return is successful, clearing the failure feedback times of the path IP.
In one embodiment, before the gateway receives the user request, the method further comprises: after a user request reaches a CDN edge node, triggering a detection application program to actively initiate periodic detection on a transit node and a source station of the CDN, and reporting detection data obtained by detection to a central path computing server; the central path calculation server calculates an optimal link according to the reported detection data and sends the calculated optimal link to the detection application program; the probe application updates and saves the optimal link for each acceleration channel.
In one embodiment, after failing back to source for more than a specified number of times in succession, the method further comprises: and setting the detection state of the optimal link as detection failure so as to remove the optimal link from the path to be selected back to the source.
In one embodiment, the method further comprises: if the continuous source returning failure does not exceed the specified times, the gateway retries and switches the path with access failure.
In one embodiment, the method further comprises: if the source returning is successful, the gateway feeds back the response data packet size and the request duration of the path IP of the optimal link to a detection application program; the detection application program calculates the download rate, and stores the download rate for the last times according to the IP of the source return link of the acceleration channel so as to calculate the average value of the download rate; and if the average downloading rate is less than the threshold value of the downloading rate, updating the downloading rate feedback times, and dynamically adjusting the detection period of the downloading rate feedback IP according to the updated downloading rate feedback times.
In one embodiment, the method further comprises: and setting the detection state of the download rate feedback IP as detection failure, and adding the download rate feedback IP into a path to be selected back to a source according to a detection result after a detection period comes.
In one embodiment, the method further comprises: and if the average downloading rate is higher than the threshold value of the downloading rate, clearing the feedback times of the downloading rate of the source link IP to recover the detection period.
Another aspect of the present invention provides a data feedback routing system for a CDN, where the system includes a gateway and a detection application, where: the gateway is used for receiving a user request and inquiring an optimal link corresponding to the user request so as to request back to a source through the optimal link; if the back source failure continuously exceeds the specified times, feeding back the IP of the failed path to the detection application program; the detection application program is used for updating the failure feedback times of the path IP, adjusting the detection period of the optimal link according to the updated failure feedback times, and adding the optimal link to a source path to be selected according to the detection result of the optimal link after the detection period comes; and if the optimal link is selected again and the source return is successful, clearing the failure feedback times of the path IP.
In one embodiment, the probe application is further configured to: after a user request reaches a CDN edge node, actively initiating periodic detection on a transit node and a source station of the CDN, and reporting detection data obtained by detection to a central path computing server; and receiving and storing the optimal link issued by the central path calculation server.
In one embodiment, the probe application is further configured to: if the source returning is successful, receiving the response data packet size and the request duration of the path IP of the optimal link fed back by the gateway; calculating the download rate, and storing the download rate for the last times according to the IP of the return source link of the acceleration channel so as to calculate the average value of the download rate; and if the average downloading rate is less than the threshold value of the downloading rate, updating the downloading rate feedback times, and dynamically adjusting the detection period of the downloading rate feedback IP according to the updated downloading rate feedback times.
The technical scheme provided by the application has at least the following technical effects:
1) the situation that the detected target IP fails to access the IP due to the fact that the IP is down or the service performance is unstable in the detection period can be avoided or reduced, the frequency of switching due to retry of access failure when the gateway forwards the dynamic request is reduced, the follow-up dynamic intelligent routing avoids links which are frequently down or unstable in service performance as much as possible, and the user access experience of CDN dynamic acceleration is improved;
2) the problem of low data downloading speed of dynamic requests caused by network congestion or network fluctuation of the detected target IP in the detection period can be avoided or reduced, so that the follow-up dynamic intelligent routing avoids links with frequent network congestion or network fluctuation as much as possible, and the acceleration effect of the user downloading requests is improved.
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The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 shows a system architecture diagram in one embodiment of the invention;
FIG. 2 is a schematic diagram illustrating the steps of a data feedback routing method according to an embodiment of the present invention;
fig. 3 is a flow chart of a data feedback routing method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The technical scheme provided by the application can be applied to the system shown in the figure 1. Edge nodes, transit nodes, source stations, and central path computation servers may be included in fig. 1, where the edge nodes and transit nodes may include gateways and probe applications therein.
Referring to fig. 1 and fig. 2, a data feedback routing method for a CDN provided in an embodiment of the present application may include the following steps.
S1: the gateway receives a user request, and inquires an optimal link corresponding to the user request so as to return to a source through the optimal link request.
S2: and if the back source failure continuously exceeds the specified times, feeding back the failed path IP to the detection application program so as to update the failure feedback times of the path IP through the detection application program.
S3: the detection application program adjusts the detection period of the optimal link according to the updated failure feedback times, and adds the optimal link to a source path to be selected back according to the detection result of the optimal link after the detection period comes; and if the optimal link is selected again and the source return is successful, clearing the failure feedback times of the path IP.
Specifically, after a user request reaches a CDN edge node, a detection application is triggered to actively initiate periodic detection on a CDN transit node and a source station, where a detection period is detect _ period (separable channel configuration), and data obtained by the detection is reported to a central path computation server.
And the central path calculation server calculates an optimal back-source link according to the reported detection data and sends the optimal back-source link to the detection application program.
The detection application program updates and stores the optimal back-source link of each acceleration channel, and after a user request reaches a CDN edge node, the gateway calls an optimal path query interface (in a dynamic library form) of the detection application program and forwards the request back to the source according to the queried optimal link.
In one embodiment, if access failures occur that continuously exceed the request _ fail _ times (specified number of times, separable channel configurations), the gateway calls a failure feedback interface (in the form of a dynamic library) to feed back the failed path IP to the probing application. Detecting the application program to increase and record the number N of failed feedback, and according to detect _ period multiplied by 2NThe detection period of the failure path IP is dynamically adjusted and set as failure. After the detection period comes, the detection result is added to the to-be-selected back source path according to the detection result, and then the back source path IP is added (namely the back source path IP is obtained)Failure path IP) if the IP is selected again and the access is successful, clearing 0 the failure feedback times N of the IP, and recovering the detection period of the IP to be normal.
In addition, if access failure occurs, but the continuous failure times do not exceed the request _ fail _ times, failure feedback is not carried out, and the gateway carries out path retry and switching of access failure.
In one embodiment, if no access failure occurs, the gateway feeds back the response packet size and the request duration of the current feedback link IP to the detection application program through a download rate feedback interface (in a dynamic library form), the detection application program calculates the download rate, and calculates the average value of the download rate according to the latest multiple times (time separable channel configuration) of the feedback link IP of the acceleration channel, if the average download rate is less than the threshold of the download rate (separable channel configuration), the download rate feedback time N is increased and recorded, and the detectjperiod × 2 is calculated according to the formulaNAnd dynamically adjusting the detection period of the download rate feedback IP and setting the detection period as failure. And after the detection period comes, adding the detection result into the path to be selected back according to the detection result.
And if the average downloading rate is higher than the threshold value of the downloading rate, the feedback times N of the downloading rate of the IP of the current return source link are cleared to 0, and the detection period is recovered to be normal.
Referring to fig. 3, in a specific application example, the technical solution of the present application may be as follows:
1) after a user request reaches a CDN edge node, the user request is received by a gateway;
2) the gateway calls an optimal back-source link query interface of a detection application program, triggers the detection application program to actively initiate periodic detection on the CDN transit node and the source station, and the detection period is detect _ period;
3) the detection application program obtains a detection result and reports the detection result to the central path calculation server;
4) the central path calculation server performs optimal back-to-source path calculation according to the reported detection data and sends the optimal back-to-source path calculation to the detection application program;
5) the gateway forwards the user request through the optimal source return link query interface to obtain a request result, if the access fails and the continuous failure exceeds the failure feedback threshold number of times, the failure feedback interface is called to notify the detection application program of the IP which fails to be accessed, and the count N of the failure feedback number of times of the IP is increased;
6) the detection application program dynamically adjusts the detection period of the IP to be detect _ period multiplied by 2 according to the failure feedback timesNSetting the IP detection result as detection failure, and the user request in the period before the detection period comes will not go back to the source of the IP, thus avoiding or reducing the problem of access failure caused by dynamic request back to the IP;
7) if the IP access of the failure feedback is successful, calling a success feedback interface to inform a detection application program, clearing 0 the count N of the failure feedback times, and recovering a detection period;
8) the gateway forwards the user request through the optimal return source link query interface to obtain a request result, and if the request is successful, the gateway calls a download rate feedback interface to feed back the size of a response data packet of the return source link IP and the request duration to the detection application program;
9) detecting the application program to calculate the current access download rate, storing the most recent download rates, calculating the average value to obtain the average download rate, and if the average download rate is smaller than the download rate threshold, increasing the count N of the download feedback times of the IP;
10) the detection application program dynamically adjusts the detection period of the IP to be detect _ period multiplied by 2 according to the download feedback times NNSetting the IP detection result as detection failure, and the user request in the period before the detection period comes will not go back to the source of the IP, thus avoiding or reducing the problem of slow download rate caused by the dynamic request back to the IP;
11) and subsequently, if the average downloading rate of the IP fed back by the downloading rate is higher than the downloading rate threshold, clearing 0 the count N of the downloading feedback times of the IP, and recovering the detection period.
The present application further provides a data feedback routing system for a CDN, the system including a gateway and a detection application, wherein:
the gateway is used for receiving a user request and inquiring an optimal link corresponding to the user request so as to request back to a source through the optimal link; if the back source failure continuously exceeds the specified times, feeding back the IP of the failed path to the detection application program;
the detection application program is used for updating the failure feedback times of the path IP, adjusting the detection period of the optimal link according to the updated failure feedback times, and adding the optimal link to a source path to be selected back according to the detection result of the optimal link after the detection period comes; and if the optimal link is selected again and the source return is successful, clearing the failure feedback times of the path IP.
In one embodiment, the probe application is further configured to: after a user request reaches a CDN edge node, actively initiating periodic detection on a transit node and a source station of the CDN, and reporting detection data obtained by detection to a central path computing server; and receiving and storing the optimal link issued by the central path calculation server.
In one embodiment, the probe application is further configured to: if the source returning is successful, receiving the response data packet size and the request duration of the path IP of the optimal link fed back by the gateway; calculating the download rate, and storing the download rate for the last times according to the IP of the return source link of the acceleration channel so as to calculate the average value of the download rate; and if the average downloading rate is less than the threshold value of the downloading rate, updating the downloading rate feedback times, and dynamically adjusting the detection period of the downloading rate feedback IP according to the updated downloading rate feedback times.
The technical scheme provided by the application has at least the following technical effects:
1) the situation that the detected target IP fails to access the IP due to the fact that the IP is down or the service performance is unstable in the detection period can be avoided or reduced, the frequency of switching due to retry of access failure when the gateway forwards the dynamic request is reduced, the follow-up dynamic intelligent routing avoids links which are frequently down or unstable in service performance as much as possible, and the user access experience of CDN dynamic acceleration is improved;
2) the problem of low data downloading speed of dynamic requests caused by network congestion or network fluctuation of the detected target IP in the detection period can be avoided or reduced, so that the follow-up dynamic intelligent routing avoids links with frequent network congestion or network fluctuation as much as possible, and the acceleration effect of the user downloading requests is improved.
It will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A data feedback routing method for a CDN (content delivery network), which is characterized by comprising the following steps:
the gateway receives a user request, and inquires an optimal link corresponding to the user request so as to return to a source through the optimal link request;
if the back source failure continuously exceeds the specified times, feeding back the failed path IP to a detection application program so as to update the failure feedback times of the path IP through the detection application program;
the detection application program adjusts the detection period of the optimal link according to the updated failure feedback times, and adds the optimal link to a source path to be selected back according to the detection result of the optimal link after the detection period comes; and if the optimal link is selected again and the source return is successful, clearing the failure feedback times of the path IP.
2. The method of claim 1, wherein before the gateway receives the user request, the method further comprises:
after a user request reaches a CDN edge node, triggering a detection application program to actively initiate periodic detection on a transit node and a source station of the CDN, and reporting detection data obtained by detection to a central path computing server;
the central path calculation server calculates an optimal link according to the reported detection data and sends the calculated optimal link to the detection application program;
the probe application updates and saves the optimal link for each acceleration channel.
3. The method of claim 1, wherein after a back source failure continues for more than a specified number of times, the method further comprises:
and setting the detection state of the optimal link as detection failure so as to remove the optimal link from the path to be selected back to the source.
4. The method of claim 1, further comprising:
if the continuous source returning failure does not exceed the specified times, the gateway retries and switches the path with access failure.
5. The method of claim 1, further comprising:
if the source returning is successful, the gateway feeds back the response data packet size and the request duration of the path IP of the optimal link to a detection application program;
the detection application program calculates the download rate, and stores the download rate for the last times according to the IP of the source return link of the acceleration channel so as to calculate the average value of the download rate;
and if the average downloading rate is less than the threshold value of the downloading rate, updating the downloading rate feedback times, and dynamically adjusting the detection period of the downloading rate feedback IP according to the updated downloading rate feedback times.
6. The method of claim 5, further comprising:
and setting the detection state of the download rate feedback IP as detection failure, and adding the download rate feedback IP into a path to be selected back to a source according to a detection result after a detection period comes.
7. The method of claim 5, further comprising:
and if the average downloading rate is higher than the threshold value of the downloading rate, resetting the feedback times of the downloading rate of the IP of the current return source link to recover the detection period.
8. A data feedback routing system for a CDN, the system comprising a gateway and a probing application, wherein:
the gateway is used for receiving a user request and inquiring an optimal link corresponding to the user request so as to request back to a source through the optimal link; if the back source failure continuously exceeds the specified times, feeding back the IP of the failed path to the detection application program;
the detection application program is used for updating the failure feedback times of the path IP, adjusting the detection period of the optimal link according to the updated failure feedback times, and adding the optimal link to a source path to be selected back according to the detection result of the optimal link after the detection period comes; and if the optimal link is selected again and the source return is successful, clearing the failure feedback times of the path IP.
9. The system of claim 8, wherein the probe application is further configured to: after a user request reaches a CDN edge node, actively initiating periodic detection on a transit node and a source station of the CDN, and reporting detection data obtained by detection to a central path computing server; and receiving and storing the optimal link issued by the central path calculation server.
10. The system of claim 8, wherein the probe application is further configured to: if the source returning is successful, receiving the response data packet size and the request duration of the path IP of the optimal link fed back by the gateway; calculating the download rate, and storing the download rate for the last times according to the IP of the return source link of the acceleration channel so as to calculate the average value of the download rate; and if the average downloading rate is less than the threshold value of the downloading rate, updating the downloading rate feedback times, and dynamically adjusting the detection period of the downloading rate feedback IP according to the updated downloading rate feedback times.
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