Lease Mechanism
Updated 2026-08-08
INTRODUCTION
English translation pending.
CORE DEFINITION
A lease grants a node exclusive rights to a resource for a bounded period; if the holder does not renew before expiry, the resource is released automatically and can be reassigned. The mechanism appears in distributed systems as leader leases and as locks with a time to live, and it is what prevents a crashed process from holding a resource forever. Key qualification: lease duration must be tuned against renewal cost and clock assumptions, since a lease that is too short causes churn and one that is too long delays recovery.
SCAFFOLDING EFFECT
Reduce cognitive load
- Set expiry dates: attach a time limit to every grant of exclusive authority. - Require renewal: make the holder periodically prove it is still alive and functioning. - Automate reclamation: release resources on timeout rather than waiting for a manual decision.
Anchor fast decisions
A permanent lock cannot distinguish a working holder from a crashed one, so a single failure can block a resource indefinitely. Bounding the grant in time converts liveness into a periodic proof, because the holder must actively renew to keep control. Failure then causes the resource to be released automatically, at the cost of occasional false revocation when renewal is merely slow.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Lease_(computer_scienceverified
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