A distributed system provides benefits such as scalability and fault tolerance. However, maintaining consistency across the distributed system is non-trivial. Consistency is vital to achieving reliability, deterministic system state, and improved user experience.
A distributed system replicates the data across multiple servers to attain improved fault tolerance, scalability, and reliability. The consistency patterns (consistency models) are a set of techniques for data storage and data management in a distributed system. The consistency pattern determines the data propagation across the distributed system. Hence, the consistency pattern will impact the scalability and reliability of the distributed system.