Kuidas nimetatakse replikatsiooni mehhanismi, kus pärast põhiserveri tõrkeid valitakse automaatselt uus juht?

The mechanism is called automatic leader election (leader election). In replication systems, such as distributed databases or clusters, when the primary server (leader) fails, a process to select a new leader from the available replicas is initiated. This process ensures continuity of operation and data consistency.

In Go and related systems, algorithms like Raft or Paxos are often used; they implement a reliable leader election mechanism and state synchronization among nodes.

An example of simplified leader election logic:

// Pseudocode for leader election
func electLeader(nodes []Node) Node {
    for _, node := range nodes {
        if node.isAlive() {
            return node // the first available node becomes the leader
        }
    }
    return nil // if no nodes are available
}

In real systems, leader election is more complex and takes into account timeouts, votes, and node states.