Summary of Distributed Systems 2.4: Fault tolerance

00:00:00 - 00:05:00

The presenter in this video discusses how fault tolerance is important in distributed systems and how failure detectors can be used to help identify when another node has failed. They explain that in a partially synchronous system, eventually perfect failure detectors are not immediate, but if a node has failed, eventually they will detect it as failed.

• 00:00:00 In this lecture, the author discusses how fault tolerance is important in distributed systems. A failure detector is a mechanism for detecting whether another node is faulty, and ideally, a perfect failure detector would be accurate in telling us whether another node is faulty or not. Timeouts are typically used to send a message to a node and wait for a response. If no response is received within a certain amount of time, the failure detector declares the node faulty and handles the situation.
• 00:05:00 In this video, the presenter discusses the various system models and how timeouts can be used to determine if a node has crashed. They go on to say that, in a partially synchronous system, eventually perfect failure detectors are not immediate and that, if a node has failed, eventually they will detect it as failed.