FA-1424 / Concurrency / Member archive

Release a distributed generation barrier: Waiters proceed before the generation release is durable · case 04

The barrier release operation is admitted even though waiters proceed before the generation release is durable.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Return a Boolean admission decision for release a distributed generation barrier. The record r must satisfy all of: len(set(r['participant_count'][0])) >= r['participant_count'][1]; all(x == r['generation_match'][0] for x in r['generation_match'][1]); set(r['registered_members'][0]) <= set(r['registered_members'][1]); r['barrier_not_broken'] is False; r['release_persisted'] is True. Extra tracing fields are ignored; validation does not mutate the record.

Why this case matters

A deterministic local contract for concurrency. Each negative fixture violates exactly one invariant. No transport timing, persistence, cryptographic verification, or full protocol implementation is claimed.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
Waiters proceed before the generation release is durable	`true`	`false`	Failed

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