One of the core challenges in a distributed system is keeping the state synchronized across all the nodes, especially when neither the nodes, or the connections between them, are reliable. The core approach to handle with is a replicated log: using the write-ahead log pattern over the cluster. Unmesh Joshi shows how this works using its most common implementation: the Raft protocol.
more… https://martinfowler.com/articles/patterns-of-distributed-systems/replicated-log.html
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