FA-613 / Replication / Member archive

Persist a replication resume checkpoint: The checkpoint exceeds durable destination progress · case 03

The replication checkpoint operation is admitted even though the checkpoint exceeds durable destination progress.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Return a Boolean admission decision for persist a replication resume checkpoint. The record r must satisfy all of: all(x in r['contiguous_applied'][1] for x in range(r['contiguous_applied'][0]+1)); r['source_incarnation'][0] == r['source_incarnation'][1]; r['durable_destination'][0] <= r['durable_destination'][1]; r['transaction_boundary'][0] in r['transaction_boundary'][1]; r['checkpoint_monotonic'][0] >= r['checkpoint_monotonic'][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 checkpoint exceeds durable destination progress	`true`	`false`	Failed

MEMBER ARCHIVE

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