Date Added: Jul 2010
In mobile distributed systems, the authors come across some issues like: mobility, low bandwidth of wireless channels and lack of stable storage on mobile nodes, disconnections, limited battery power and high failure rate of mobile nodes. Fault Tolerance Techniques enable systems to perform tasks in the presence of faults. The likelihood of faults grows as systems are becoming more complex and applications are requiring more resources, including execution speed, storage capacity and communication bandwidth. A checkpoint is a local state of a process saved on stable storage. In a distributed system, since the processes in the system do not share memory, a global state of the system is defined as a set of local states, one from each process.