test(delivery): prove single-claim across instances and slow-callback redelivery (RIG-3107) - #1353
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… redelivery (RIG-3107) T4 transport proofs: - Two delivery halves on one NATS and one Postgres claim each of 20 posts exactly once through the shared durable queue-group. - A healthy callback held past AckWait is redelivered to the other instance; an always-slow one exhausts MaxDeliver (server advisory). Nak-to-MaxDeliver and DLQ-park on a callback failure wait on the callback error-return decision. An always-slow healthy event is dropped at MaxDeliver, not parked, contrary to the record wording; routed to Matt. Spec-impact: none. Refs RIG-3107 Co-authored-by: Matt Wilkinson <matt@rigel.build>
This was referenced Sep 26, 2026
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Compass engineering docs preview: https://compass-managed-rig-3107-t4.compass-eng-docs.pages.dev Deployed from |
Review lows: the always-slow test now checks the advisory payload (deliveries, stream seq) and that nothing reaches DLQSubject; the held callback is released on failure; the two-instance test reports any claim outside the posted set; the dead attempts counter is gone. Spec-impact: none. Refs RIG-3107 Co-authored-by: Matt Wilkinson <matt@rigel.build>
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This PR is part of a stack containing 6 PRs:
mainT4 transport proofs:
exactly once through the shared durable queue-group.
instance; an always-slow one exhausts MaxDeliver (server advisory).
Nak-to-MaxDeliver and DLQ-park on a callback failure wait on the callback
error-return decision. An always-slow healthy event is dropped at
MaxDeliver, not parked, contrary to the record wording; routed to Matt.
Spec-impact: none. Refs RIG-3107
Co-authored-by: Matt Wilkinson matt@rigel.build