Designing distributed systems also means taking into account link defects, unreachable gateways, and other failures. Embedded devices should not stop working when disconnected from the internet, but rather offer fall-back mechanisms, based on local gateways. Consider, for example, a demotic IoT system for controlling all the heating and cooling units in a house, accessible from portable devices and coordinated remotely using any network access. Temperature sensors, heaters, and coolers are controlled by a mesh network of embedded devices, while the central control is on remote cloud servers. The system can control the actuators remotely, based on user settings and sensor readings. This gives ...
Distributed systems – single points of failure
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