Lecture
This lecture introduces causal broadcast, a communication protocol that ensures messages are delivered in a causal order. It covers the intuition behind causal broadcast, the specifications, and algorithms for achieving causal order. The lecture explains the concepts of causality, reliable causal order broadcast, and uniform causal broadcast. It presents algorithms for reliable causal order broadcast using reliable broadcast and achieving uniform causal broadcast by utilizing an underlying uniform reliable broadcast. The lecture also discusses the implementation details of these algorithms, including the use of vector clocks and garbage collection to maintain causal order.