A. Jesse Jiryu Davis • 12/19/2025

LeaseGuard: Raft Leases Done Right!

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This technical article discusses the problem of stale reads in leader-based consensus protocols like Raft and introduces LeaseGuard, a novel lease protocol designed by the MongoDB Distributed Systems Research Group. It explains how LeaseGuard leverages Raft's Leader Completeness property to simplify lease management, using the log itself as the lease to enable fast, consistent reads without interfering with elections, improving recovery time after a leader crash.

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#distributed systems #Raft #Consensus Protocol
LeaseGuard: Raft Leases Done Right!

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