WO2011020367A1 - 基于cdn的节点主备用控制器切换方法及cdn网络 - Google Patents
基于cdn的节点主备用控制器切换方法及cdn网络 Download PDFInfo
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- WO2011020367A1 WO2011020367A1 PCT/CN2010/073849 CN2010073849W WO2011020367A1 WO 2011020367 A1 WO2011020367 A1 WO 2011020367A1 CN 2010073849 W CN2010073849 W CN 2010073849W WO 2011020367 A1 WO2011020367 A1 WO 2011020367A1
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- controller
- standby
- standby controller
- master controller
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
- G06F11/202—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where processing functionality is redundant
- G06F11/2023—Failover techniques
- G06F11/2028—Failover techniques eliminating a faulty processor or activating a spare
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
- G06F11/202—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where processing functionality is redundant
- G06F11/2041—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where processing functionality is redundant with more than one idle spare processing component
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
-
- 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
- H04L43/0817—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking functioning
-
- 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
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
- H04N21/2404—Monitoring of server processing errors or hardware failure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
- H04N21/2405—Monitoring of the internal components or processes of the server, e.g. server load
-
- 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
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1034—Reaction to server failures by a load balancer
Definitions
- the present invention relates to the field of communications, and in particular, to a CDN-based node primary standby controller switching method and a CDN network.
- a distribution network is a new network architecture that can publish the content of a service to the "edge" of the network closest to the user, so that the user can obtain the required content in the vicinity and improve the operating efficiency of the system.
- CDN is used in commercial systems in real life, such as IPTV (Internet TV), the global eye, etc., with good prospects.
- the CDN usually operates in conjunction with other modules, which mainly include streaming media systems and some corresponding terminal devices.
- the CDN belongs to the business layer and is mainly used to schedule and process related services.
- the streaming media system is mainly responsible for the implementation of the business.
- the CDN is mainly composed of a CDN Manager (CDN Manager) and a CDN Node (CDN Node), and one CDN Node is composed of a plurality of CDN Agents (node controllers) and other accessory devices.
- the CDN Manager is responsible for CDN traffic load balancing, content distribution and scheduling. Usually a CDN Manager manages multiple CDN Nodes.
- the CDN Node which is the business entity of the CDN, is deployed to serve users near the edge of the network.
- the CDN Agent is a CDN Node controller, which is responsible for load balancing management of the node and content management within the node, and implements service control of the CDN Node. At the same time, only one CDN Agent controls the CDN Node. This CDN Agent is called the node master controller, and the other CDN Agents are node standby controllers.
- the current implementation method mostly uses the master-slave controller triggered by the manager to be converted into a blueprint, that is, the manager uses the WAN-based heartbeat message detection mechanism. If the network controller is abnormal and the node controller does not reply back for a long time, the manager considers the node controller. Abnormal, the current node master controller is set For backup, go blindly to find other node controllers with normal heartbeat messages. In fact, in most cases, the current node master controller status has been normal, but the WAN communication problem has caused the manager to veto the current node master controller.
- the current node master controller service capability is available, but due to the manager If the heartbeat message is abnormal, the manager navigates the requester's service request to other node controllers through the business logic, which greatly wastes the service capability of the current node controller. Furthermore, if the WAN is in a good or bad state for a long time, the manager must frequently detect and switch all the controllers under the node, causing switching oscillations, consuming the performance of the manager and the bandwidth of the network.
- the technical problem to be solved by the present invention is to provide a CDN-based node master standby controller switching method and a CDN network that can save resources.
- a node primary standby controller switching method based on a content distribution network comprising: the node standby controller detecting a state of a current node primary controller;
- the node standby controller selects a node standby controller to replace the new node master controller according to a preset rule.
- the process in which the node standby controller selects a node standby controller to replace the new node master controller according to a preset rule includes the following steps:
- the node standby controller that first detects the abnormality of the current node master controller, selects a node standby controller as the new node master controller according to a preset rule, and sends a switching request to notify the node standby controller;
- the selected node standby controller switches to the new node master controller based on the switching request, notifies the other standby controller of the switching result and reports to the manager.
- the node standby controller detects the state of the node master controller through a heartbeat message.
- the preset rule includes a rule of selecting a node standby controller with a normal state and an optimal performance according to a state and a performance parameter of the node standby controller.
- the performance parameters include CPU usage and I/O wait time.
- the selected node standby controller in step B implements switching to the new node primary controller by setting its own state as the node primary controller.
- step B the notification is specifically implemented by sending a broadcast message.
- the manager Before the node standby controller detects the state of the current node master controller, the manager further sets the configured first node controller as the node master controller, and sets the subsequently configured node controller and the newly added node controller as nodes.
- the manager in the step B After receiving the handover result, the manager in the step B sends the service signaling to the new node main controller.
- the step B further includes: after the manager does not receive the heartbeat message of the current node master controller, the service signaling is not sent temporarily.
- a content distribution network includes a manager, a node master controller and at least one node standby controller, wherein the manager is responsible for traffic load balancing of a content distribution network, and the node master controller is configured to control a content distribution network node
- the node standby controller is configured to detect the node master controller, and when detecting that the node master controller is abnormal, select a node standby controller to replace the new node master controller.
- the first node standby controller that first detects the node master controller abnormality selects the second node standby controller that meets the preset rule as the new node master controller, and sends a switching request to notify the second node standby controller, second The node standby controller switches to the new node main controller based on the switching request, notifies the other standby controller of the switching result, and reports to the manager.
- Node standby controllers detect each other and exchange and store each other's performance parameters
- the preset rule includes a rule of selecting a node standby controller with a normal state and an optimal performance according to the state and performance parameters of the node standby controller.
- the second node standby controller is further configured to set its own state as a node master controller based on the handover request.
- the manager is configured to set the configured first node controller as a node primary controller, and set a subsequently configured node controller and a newly added node controller as a node standby controller, where the node primary controller further uses Set itself to the node standby controller when it returns to normal after its abnormality.
- the present invention uses a node standby controller to detect the current node master controller.
- the node standby controller selects a node standby controller to replace the new node master controller according to a preset rule;
- the node master controller and the node standby controller of the same node exist in the same gateway at the same time. Therefore, the present invention avoids the problem that the manager blindly replaces the node master controller due to the network abnormality instead of the node master controller failure, and effectively improves the problem.
- the performance of the manager and the bandwidth of the network are examples of the network.
- the present invention converts the trigger of the node standby controller into a node master controller after selecting a new node master controller, so that normal switching can be achieved even when the network between the manager and the controller is abnormal. Improve the robustness of the system.
- the present invention exchanges performance parameters with each other by the node standby controller.
- the node primary controller fails, any of the first discovered node standby controllers can select an optimal node for backup through its stored performance parameters.
- the controller switches it to the node master controller, further optimizing the network control capability and effectively saving the manager's overhead in controller selection.
- 1 is a schematic diagram of relationships between logical entities when a node master controller is not switched in a specific implementation manner of the method of the present invention
- 2 is a flow chart of a specific embodiment of the method of the present invention
- FIG. 3 is a schematic diagram of relationships between logical entities after switching of a node master controller in a specific implementation manner of the method of the present invention
- FIG. 4 is a flow chart of a node standby controller triggering a handover in a specific embodiment of the method of the present invention. detailed description
- the node standby controller that first finds the node master controller abnormality selects a node standby controller according to a preset rule and triggers the node standby controller as a new node master controller.
- a content distribution network of the present invention includes a manager, a node master controller, and at least one node standby controller, where the manager is responsible for traffic load balancing of the content distribution network.
- the node master controller is used to control the content distribution network node
- the node standby controller is used to detect the node master controller.
- a node standby controller is selected instead of being the new node master controller.
- the first node standby controller that first detects the abnormality of the node master controller selects the second node standby controller that conforms to the preset rule as the new node master controller, and sends a switching request to notify the second node standby controller.
- the second node standby controller switches to the new node master controller based on the handover request, notifies the other standby controllers of the handover result and reports to the manager.
- the second node standby controller notifies the other standby controllers of the modified self status by sending a broadcast message.
- the second node standby controller reports the status to the manager by sending a heartbeat message.
- the node standby controller is used to periodically detect the node master controller, and specifically detects the node master controller through a heartbeat message.
- the preset rules include rules for selecting a node standby controller with normal status and optimal performance according to the state and performance parameters of the node standby controller; performance parameters include CPU usage and I/O, etc. Waiting for time.
- a node standby controller with a minimum CPU usage and I/O latency weighting value may be selected.
- the node standby controller is also used to detect other node standby controllers, exchange and store each other's performance parameters.
- the node standby controller is also used to periodically detect other node standby controllers, and may also be detected by a heartbeat message.
- the second node standby controller is also used to set its own state as a node master based on the handover request.
- the manager can be used to set the first node controller of the configuration as the node master controller, and the node controller and the newly added node controller that are subsequently configured as the node standby controller.
- the manager can set a functioning, performance-optimized node controller as a node master.
- the node master controller is also used to set itself as a node standby controller when it returns to normal after an exception.
- the manager is further configured to send the service signaling to the new node main controller after receiving the handover result.
- the manager is also configured to not send the service signaling to the current node master controller after receiving the heartbeat information of the current node master controller.
- the current node's primary controller periodically reports its status to the manager to indicate that it is the node's primary controller.
- the manager delivers the current node's service to the current node's primary controller.
- the invention relates to a CDN-based node primary standby controller switching method, and an implementation manner thereof is as shown in FIG. 2, including the following steps:
- Step 201 The node standby controller detects the state of the node master controller; all node standby controllers detect the state of the node master controller.
- Step 202 The node standby controller that first detects the abnormality of the node main controller first selects a node standby controller as the new node primary controller according to a preset rule, and sends a handover request to notify the node standby controller.
- the node standby controller detects other node standby controllers, Exchange and store each other's performance parameters.
- the node standby controller can periodically detect other node standby controllers, and can also detect through heartbeat messages.
- the preset rules include rules for selecting a node standby controller with normal status and optimal performance according to the state and performance parameters of the node standby controller; performance parameters include CPU usage and I/O waiting time.
- the node standby controller that first finds the node master controller abnormality can select the node standby controller with the smallest CPU usage and I/O wait time weighting value according to the state and performance parameters of the node standby controller it saves.
- Step 203 The selected node standby controller switches to the new node primary controller based on the handover request, and specifically can switch itself to the node primary controller by setting its own state as the node primary controller.
- the node standby controller that is selected after the status setting is completed notifies the other standby controllers of the status and reports them to the manager.
- the new node master controller specifically notifies other standby controllers of its number by sending a broadcast message.
- the normal node master controller or the newly added node controller sets itself as a node standby controller, and then detects whether there is a node in the node.
- the main controller if there is a node master controller, proceeds to step 201. If there is no node master controller, it searches for a node standby controller with normal state and optimal performance, and switches it to the node master controller.
- the node master controller communicates with the manager abnormally, but the node master controller itself is in good condition. At this time, the node master controller still provides services for the node user, but the manager does not receive the node master controller status report for a long time. At this time, the manager does not send any service signaling to the primary controller of the node until the communication is normal, and the manager re-receives the state of the node master controller.
- the invention relates to a CDN-based node primary standby controller switching method, wherein the relationship between logical entities is as shown in FIG. 1 , and all node standby controllers detect the node primary controller, and all node standby controllers are detected by two. The performance of the current node is reported to the current controller.
- the invention relates to a CDN-based node primary standby controller switching method. After the node primary standby controller is switched, the relationship between the logical entities is as shown in FIG. 3, and is switched to the original node primary controller of the node standby controller. Other node standby controllers detect and exchange performance data in pairs. After the node standby controller with the normal state and normal performance is switched to the new node master controller, all node standby controllers detect the state of the new node master controller, and the new node master control The device reports the status to the manager periodically.
- the node standby controller CDN Agent1 first detects the current node primary controller abnormality as an example, wherein CDNAgentX is the current node. main controller.
- Step 401 The CDN Agent1 detects the primary controller CDNAgentX; the CDN Agent1 periodically detects the current primary controller CDN AgentX, and can specifically detect by using a heartbeat message;
- Step 402 Determine whether the CDN AgentX status is normal; CDN Agent1 determines whether the CDN AgentX status is normal, and then proceeds to step 403, otherwise proceeds to step 404;
- Step 403 The detection ends; if the CDNAgentX state is normal, the detection ends, and the CDN AgentX waits for the next round of detection;
- Step 404 When the CDN AgentX status is abnormal, the CDN Agent1 acquires all the node standby controllers of the node; the CDN Agent1 acquires all the node standby controllers of the node from the memory; Step 405: traverse the node standby controller list, according to a preset rule The node standby controller CDN Agent2 is selected; the CDN Agent1 traverses the node standby controller list.
- the CDN Agent1 selects a node standby controller CDN whose state is normal and the CPU usage rate and the I/O latency weighting value are the smallest. Agent2; CDN Agentl may also select a node standby controller according to other preset rules;
- Step 406 CDNAgentl sends a handover request to CDNAgent2; CDN Agent1 sends a handover request to CDNAgent2, requesting to switch CDN Agent2 to node master controller; Step 407: CDNAgent2 is switched to node master controller; CDNAgent2 receives handover After the request, the user is switched to the node master controller based on the switching request; in a specific implementation manner, the CDN Agent 2 can update its own state to the node master controller;
- Step 408 Notifying other nodes of the standby controller; CDNAgent2 notifying all other node standby controllers, CDN Agent2 is the new node primary controller; CDN Agent2 may specifically notify other nodes of the standby controller through broadcast messages, and the other nodes are standby controllers to the scheduled time. Detecting the new node master controller;
- Step 409 CDNAgent2 reports the status to the manager
- Step 410 The manager receives the status report and modifies the information of the node master controller. After receiving the status of the new node master controller, the manager updates the parameters of the host controller of the upper layer service node, and the manager only delivers the service to the new node master. Controller
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10809500.1A EP2458768B1 (en) | 2009-08-20 | 2010-06-11 | Method for switching node main-standby controllers based on content delivery network (cdn) and cdn thereof |
RU2012108963/08A RU2517373C2 (ru) | 2009-08-20 | 2010-06-11 | Способ переключения основного/резервного контроллеров узла на основе сети доставки контента и соответствующая сеть доставки контента |
US13/391,019 US9098468B2 (en) | 2009-08-20 | 2010-06-11 | Method for switching node main-standby controllers based on content delivery network (CDN) and CDN thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN200910189610.X | 2009-08-20 | ||
CN200910189610.XA CN101640688B (zh) | 2009-08-20 | 2009-08-20 | 基于cdn的节点主备用控制器切换方法及cdn网络 |
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WO2011020367A1 true WO2011020367A1 (zh) | 2011-02-24 |
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PCT/CN2010/073849 WO2011020367A1 (zh) | 2009-08-20 | 2010-06-11 | 基于cdn的节点主备用控制器切换方法及cdn网络 |
Country Status (5)
Country | Link |
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US (1) | US9098468B2 (zh) |
EP (1) | EP2458768B1 (zh) |
CN (1) | CN101640688B (zh) |
RU (1) | RU2517373C2 (zh) |
WO (1) | WO2011020367A1 (zh) |
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EP2458768B1 (en) | 2016-08-24 |
US9098468B2 (en) | 2015-08-04 |
CN101640688B (zh) | 2014-03-12 |
RU2012108963A (ru) | 2013-09-27 |
EP2458768A4 (en) | 2013-05-15 |
CN101640688A (zh) | 2010-02-03 |
EP2458768A1 (en) | 2012-05-30 |
RU2517373C2 (ru) | 2014-05-27 |
US20120151550A1 (en) | 2012-06-14 |
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