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264 results about "Node level" patented technology

Failure detection and fault tolerance method and failure detection and fault tolerance system for real-time cloud platform

The invention relates to a failure detection and fault tolerance method and a failure detection and fault tolerance system for a real-time cloud platform. The system comprises a client used for sending a command, summiting a task and storing tasks assigned to working nodes in corresponding paths, a global state monitoring module used for monitoring the operation state of the working nodes, carrying out node-level failure detection and fault tolerance according to heartbeat information uploaded by the working nodes and performing migration of a task in a failure node, a global state storage module used for storing the working state and heartbeat information of the global state monitoring module and the working nodes, and working nodes used for performing a task, running a daemon process to guard a work process and performing program-level failure detection and fault tolerance. State information of a whole cluster is all stored in a Zookeeper system, a stateless architecture of the nodes is realized, a node failure does not cause state loss, the system has a perfect failure detection and fault tolerance mechanism, multilevel fault tolerance is realized, and uninterrupted operation of real-time services is guaranteed.
Owner:INST OF INFORMATION ENG CHINESE ACAD OF SCI

Method for adaptively routing underwater sensor network on basis of difference

The invention generally relates to the technical field of network communication, and particularly relates to a method for routing an underwater sensor network. The method for routing comprises the following constituent parts: (1) node grade definition; (2) node grade information acquiring and updating processes; (3) neighbor node information recording; (4) directional flooding mechanism based on grade difference; (5) adaptive routing step based on the grade difference, node density and residual energy; and (6) differential geographical routing step based on the grade difference and distance. The method has the following advantages that the best next hop adaptive routing is determined on the basis of the neighbor table information to reduce redundant paths, so that the energy efficiency is improved to a great extent; and the adaptive routing adopts immediate routing, so that the inhibition time of the conventional underwater UWSN (underwater wireless sensor network) routing to a received package is avoided, and the time delay from terminal to terminal is reduced. A great deal of simulation experiments prove that through an underwater sensor network adaptive routing protocol based on the difference, the energy consumption can be reduced to a great extent, the time delay from terminal to terminal is reduced, the node utilization equity is improved, and the whole network life time is prolonged.
Owner:QINGHAI NORMAL UNIV +1

Redundancy management method for improving availability of monitoring pair based fault tolerant system

The invention discloses a redundancy management method for improving the availability of a monitoring pair based fault tolerant system. The method comprises the steps of intra-node voting and monitoring and node-level voting and monitoring. During the intra-node voting and monitoring, a controller A and a controller B are consistent by comparison and data of the controller A are selected to enter the node-level voting and monitoring. During the node-level voting and monitoring, a mid-value is selected as a reference value of monitoring from values of three signals of three nodes, and if a difference between other two non mid-value signals and a mid-value signal is within a threshold range, then the non mid-value signals are normal, otherwise, the non mid-value signals are faulted. According to the redundancy management method, the redundancy management of a monitoring pair based three-node or two-node fault tolerant computer is realized; the credibility of system data of a fault tolerant computer system can be ensured; and compared with fault silence based monitoring pair fault tolerance, the redundancy degradation of the system is slowed down, and a backup controller can be reconfigured to be a main controller when a fault occurs once in a node through a software and hardware combination mode, so that the system is ensured not to be degraded.
Owner:XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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