具有共识机制的SDN发布订阅系统 的研究与设计

he Internet of Things achieves the interconnection of all things, but at the same time, these connected things are not all trustworthy, so a consensus mechanism of some kind is needed. Only by combining the Internet of Things and the consensus mechanism can we bring broader development to the Internet of Things platform. space. So this article attempts to implement a consensus mechanism on top of the original SDN-based publish and subscribe system. First, a distributed message ordering subsystem is proposed. This system implements the global ordering of messages in the system and proposes the concept of a sequence node on the cluster controller to complete the ordering. The sequencing subsystem is completed by the administrator and the sequence node writing. The administrator is responsible for token management and synchronizing the sequence number with the sequence node, and the sequence node crash management. The sequence node is responsible for the message togbuj9ianting, and completes the message sequence with the administrator. And issue a serial number, and administrator crash management. After the administrator crashes, a new administrator is elected by election. Secondly, a message multi-backup cache subsystem based on the message forwarding path is proposed, and the concepts of temporary cache nodes, network edge cache nodes, and backup nodes are defined. The three nodes work together to ensure the reliability of the messages in the system. It mainly implements a multi-point cache mechanism with minimum cost, a multi-backup consistency guarantee mechanism, and a message cache module based on a double-layer index.