FA-458 / Consensus / Member archive

Serve a linearizable read at a confirmed index: A read uses a response set lacking a voting majority · case 03

The read index operation is admitted even though a read uses a response set lacking a voting majority.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Return a Boolean admission decision for serve a linearizable read at a confirmed index. The record r must satisfy all of: r['current_term_commit'][0] == r['current_term_commit'][1]; len(set(r['quorum_confirmation'][0])) * 2 > r['quorum_confirmation'][1]; r['applied_floor'][0] >= r['applied_floor'][1]; r['context_binding'][0] == r['context_binding'][1]; r['term_stability'][0] == r['term_stability'][1]. Extra tracing fields are ignored; validation does not mutate the record.

Why this case matters

A deterministic local contract for consensus. 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
A read uses a response set lacking a voting majority	`true`	`false`	Failed

MEMBER ARCHIVE

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