Lack of consensus in distributed control systems

摘要

A device (115) may correspond to a physical access controller (115) in a distributed physical access control system (110). A method, performed by the device (115) in a distributed system (110), may include detecting that another device in the distributed system has become unavailable; determining that a loss of consensus has occurred in the distributed system based on detecting that the other device has become unavailable; generating a list of available devices in the distributed system (110); and sending an alarm message to administrative device (130), wherein the alarm message indicates the loss of consensus and wherein the alarm message includes the list of available devices.