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Commit a consume-transform-publish transaction: A previous producer instance commits an old transaction · case 04

The transactional consume operation is admitted even though a previous producer instance commits an old transaction.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Return a Boolean admission decision for commit a consume-transform-publish transaction. The record r must satisfy all of: r['input_owned'][0] == r['input_owned'][1]; r['output_committed'] is True; r['offset_exact'][0] == r['offset_exact'][1]+1; r['transaction_open'] == 'open'; r['producer_fenced'][0] == r['producer_fenced'][1]. Extra tracing fields are ignored; validation does not mutate the record.

Why this case matters

A deterministic local contract for queues. 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 previous producer instance commits an old transaction	`true`	`false`	Failed

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