The component instances are monitored by a separate Watchdog component and replaced in case of failures. Components are scaled out and multiple instances of them are deployed to redundant resources. Individual application components rely on external state information by implementing the Stateless Component pattern. To enable high availability under such conditions, applications have to rely on redundant application component instances and the failure of these instances has to be detected and coped with automatically. Embedded devices frequently rely on watchdog hardware that resets it automatically if software stops responding (more specifically, stops signalling the. IP device functionality is usually monitored. If a Distributed Application is comprised of many application components it is dependent on the availability of all component instances. The IP WatchDog or Ping WatchDog term refers to a method of detecting if an IP device works correctly.

How can applications automatically detect failing application components and handle their replacement?

Applications cope with failures automatically by monitoring and replacing application component instances if the provider-assured availability is insufficient.