Читать книгу From Traditional Fault Tolerance to Blockchain - Wenbing Zhao - Страница 36

In this section, we define the system model used in the checkpointing and logging algorithms introduced in this chapter. The algorithms are executed in a distributed system that consists of N number of processes. Processes within the system interact with each other by sending and receiving messages. These processes may also interact with the outside world by message exchanges. The input message to the distributed system from the outside world is often a request message sent by the user of the system. The output message from the system is the corresponding response message. An example distributed system consisting of 4 processes is shown in Figure 2.1.

Figure 2.1 An example distributed system.