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DOWNLOADING CONCEPT: 1. THE TWO GENERALS PROBLEM...
↳Distributed consensus is based on an unsolvable thought experiment: Two generals are on opposite sides of a valley, trying to coordinate an attack on a city in the middle.
↳If they attack together, they win.
↳If one attacks alone, they die.
↳General A sends a messenger: 'Attack at dawn.
↳Acknowledge.' General B receives it and sends a messenger back: 'I acknowledge.' But General B now thinks: 'What if my messenger gets captured? General A won't attack if he doesn't get my acknowledgement.' So General A must send a messenger back acknowledging the acknowledgement.
↳This loops infinitely.
↳Over an unreliable network, it is mathematically impossible to guarantee 100% agreement between two nodes.
▲ LIVE INCIDENTYour 5-node etcd cluster is experiencing a massive network partition.