in distributed computing and multi-agent systems is to achieve overall system reliability in the presence of a number of faulty processes. - https://en.wikipedia.org/wiki/Consensus_(computer_science)
near us: • Have you ever done discussing about where and what you’ll eat at lunch with your friends? • Picking a time with your teammates to schedule a meeting?
is a concept that a distributed database system can only have 2 of the 3: • Consistency – The data is same in all the server nodes(leader or follower), implying the system has nearly instantaneous sync capabilities • Availability – Every request gets a response(success/failure). It requires the system to be operational 100% of the time to serve requests, and • Partition Tolerance – The system continues to respond, even after some of the server nodes fail. This implies that the system maintains all the requests/responses function somehow.
actually just one “master” and the rest of them is “follower” (similar to Raft, will discuss later). Write operation only can be done in master node, while follower only serve read operation. https://github.com/mongodb/mongo-go-driver /blob/v1.5.1/mongo/collection.go#L94-L97 https://github.com/mongodb/mongo-go-driver /blob/v1.5.1/mongo/description/server_selecto r.go#L108-L125 https://docs.mongodb.com/manual/reference/ glossary/#std-term-driver
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