Databases · Senior · Question 20 of 75

What is 'split brain' in a failover setup?

✓Correct answer: Two nodes both believe they're the primary and accept writes, so data diverges
2A table partitioned into two parts
3A query split across two CPUs

Explanation

Failover tools like Patroni use a consensus store (etcd, Consul) and fencing so only one primary can accept writes.

Further reading

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