FA-1555 / Replication / Member archive

Complete a streaming checkpoint barrier: A checkpoint completes before every input channel reaches its barrier · case 05

The checkpoint barrier operation is admitted even though a checkpoint completes before every input channel reaches its barrier.

Member previewVariant 5 · 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
A checkpoint completes before every input channel reaches its barrier	`true`	`false`	Failed

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