12. Split Brain

A leader-based distributed system can end up with two active leaders at once. Split-brain is that scenario, and this pattern is how a system finds the real leader and ignores the other.

Background

In a distributed system with a central, or leader, server, a dead leader is dangerous. The system must find a substitute fast, or it starts to fail.

The trouble is, we can never be fully sure the leader is truly gone

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