Imagine you want to withdraw some cash from an ATM. You expect it to show your account balance correctly and process your request quickly. However, network delays make it hard for the system to meet both of these simple expectations at the same time. If an ATM system tries to achieve high “consistency,” meaning that it displays the latest account balance by checking a remote database, it could make you wait or even prevent you from accessing your accounts during busy times.
This article was originally published on this website.