FA-057 / Distributed coordination / Member archive

A stale renewal extends a later incarnation of a lease · case 02

A delayed renewal is accepted after the same worker name has reacquired the lease.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

A lease is [owner,generation,deadline]. A renewal names [owner,generation], now and nonnegative duration. If ownership matches and now < deadline, return a new deadline now+duration; otherwise return the unchanged lease. This models an atomic compare-and-swap at one authoritative clock.

Why this case matters

Models lease ABA during worker restarts and delayed network deliveries without assuming synchronized client clocks or implementing a complete distributed lease protocol.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
previous incarnation renewal	`["worker", 3, 120]`	`["worker", 3, 102]`	Failed

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