FA-558 / Replication / Member archive

Promote a bootstrapped replica: The retained log starts after the snapshot successor · case 03

The replica bootstrap operation is admitted even though the retained log starts after the snapshot successor.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Return a Boolean admission decision for promote a bootstrapped replica. The record r must satisfy all of: r['snapshot_ready'] is True; r['wal_bridge'][0] <= r['wal_bridge'][1]+1; r['replay_floor'][0] >= r['replay_floor'][1]; r['schema_compatible'][0] in r['schema_compatible'][1]; r['cluster_identity'][0] == r['cluster_identity'][1]. Extra tracing fields are ignored; validation does not mutate the record.

Why this case matters

A deterministic local contract for replication. 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
The retained log starts after the snapshot successor	`true`	`false`	Failed

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