FA-1572 / Replication / Member archive

Complete a streaming checkpoint barrier: Upstream progress commits before the transactional sink prepares · case 02

The checkpoint barrier operation is admitted even though upstream progress commits before the transactional sink prepares.

Member previewVariant 2 · 3 implementations · 9 checks per implementation

Case contract

Return a Boolean admission decision for complete a streaming checkpoint barrier. The record r must satisfy all of: set(r['all_inputs'][0]) == set(r['all_inputs'][1]); len(set(r['barrier_id'])) == 1; r['state_flushed'] is True; r['inflight_captured'][0] == r['inflight_captured'][1]; r['sink_prepared'] == 'prepared'. 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
Upstream progress commits before the transactional sink prepares	`true`	`false`	Failed

MEMBER ARCHIVE

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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