Fault-Tolerant Destributed Systems in a Mobile Agent Model

A transactional agent is a mobile agent to manipulate objects with some type of commitment condition. We assume computers may stop by fault while networks are reliable. In the client-server model, servers are fault-tolerant according to the replication and checkpointing technologies. However, an application program cannot be performed if a client is faulty. A program can be performed on another operational computer even if a computer is faulty in the transactional agent model. There are kinds of faulty computers; current, destination, and sibling computers where a transactional agent now exist, will move, and has visited, respectively. We discuss how the transactional agent is tolerant of the types of computer faults