Ethereum Smart Contract Development

Consensus in distributed systems

Consensus is a problem that arises in distributed systems that are replicating a common state, such as data in a database. It is the task of getting all processes in a group to agree on some specific value based on the votes of each process. The consensus algorithm cannot just invent a value. All processes must agree upon the same value and it must be a value that was submitted by at least one of the processes.

In the previous example of HappySpouse.com, to prevent the consistency problem, we can have a run-around clerk, who will update the other notebook when one of the notebooks is updated. The greatest benefit of this is that he can work in the background, and an update doesn't have to wait for the other ...