Date Added: Jun 2012
In this paper, the authors give a survey on various fault tolerance techniques and related issues in distributed systems and WSNs. More specially speaking, they explain about two most important issues; multiple fault handling capability and performance. This survey provides the related research results and also explored the future directions about fault tolerance techniques, and it is a good reference for researcher. A distributed system is a collection of independent computers that appears to its users as a single coherent system.