consensus
Make participating nodes agree on decisions despite specified failures.
Use this when Nodes must agree on a leader or committed log instead of inventing competing histories.
without the term
“Our nodes need to agree on committed changes even when a node crashes. Choose a supported mechanism.”
with the term · How do you ask a model for consensus?
Use the platform’s consensus mechanism. Explain its commit rule and verify behavior on leader loss and quorum loss.
What is consensus?
Consensus protocols establish agreement under a stated failure model. Raft manages a replicated log with elections and majority rules; progress needs enough reachable nodes and suitable communication timing.
Why does consensus matter when vibe coding?
An agent can mistake broadcasting a value or counting responses for a safe consensus protocol.
How do you do consensus?
Use a proven implementation. Define crash versus Byzantine assumptions, membership changes, and commit rules. Check leader loss, partitions, and rejoining nodes.
What goes wrong with consensus?
Safety and progress are different properties. A safe system can stop accepting writes when it cannot decide.
Sources for this entry
- Ongaro and Ousterhout: Raft
Replicated-log consensus, majority voting, safe membership changes, and timing requirements for progress.
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