Replay Lab
Failure replay, route comparison, and smallest-fix evidence.
Selected trace
trace_a5c65ebc-ebd5-4d88-a937-835ee5a30fd3
Original failed payment
trace_a5c65ebc-ebd5-4d88-a937-835ee5a30fd3
- Amount
- 500 CKB
- Failure time
- 84ms
- Sender
- fiber-devnet-sender-01
- Receiver
- fiber-devnet-receiver-09
ROUTE_CAPACITY_INSUFFICIENT
Route capacity insufficient
A route was discovered, but the available forwarding capacity was lower than the requested payment amount.
Failure Timeline
Lifecycle events captured in milliseconds.
- 0msrequest_receivedinfo
Payment attempt created for 500 CKB
- 8msinvoice_validationsuccess
Invoice fields parsed
- 18msroute_discoveryinfo
Candidate routes loaded from sandbox graph
- 50mspolicy_checkinfo
Route policies evaluated
- 62mscapacity_probewarning
Candidate path capacity: 320 CKB available for 500 CKB request
- 84mscapacity_probeerror
Route capacity insufficient: max forwardable 320 CKB
Generated Replay Scenarios
Selected from the failure fingerprint, not manually scripted in the UI.
Recommended fix
Smallest route-capacity fix
Replay showed the original 500 CKB payment fails, 80% still fails, and a partial payment of 320 CKB succeeds. Splitting over the same static route does not complete the original total; exact outbound capacity repair and an alternate route succeeded.
Send at most 320 CKB now as a partial payment, or add capacity to send the full 500 CKB.
If the operator controls liquidity, add at least 180 CKB outbound route capacity.
Original vs Replay
Original
Failed- Amount
- 500 CKB
- Latency
- 84ms
- Failed at
- capacity_probe
Replay
success- What changed
- Reduced amount to 64%: 320 CKB
- Latency
- 58ms
Replay Evidence
same_conditions
Original amount, route, peer state, fee limit, timeout, and asset unchanged
The original failure reproduces under the same conditions, confirming the fingerprint is stable.
reduced_amount_80
Reduced amount to 80%: 400 CKB
400 CKB still exceeds the constrained route capacity, so the payment fails again.
reduced_amount_64
Reduced amount to 64%: 320 CKB
320 CKB matches the observed maximum forwardable capacity and settles.
increased_outbound_capacity
Added exact outbound route capacity deficit: 180 CKB
Adding 180 CKB raises route capacity to the original payment amount and removes the constrained hop.
alternate_route
Selected alternate route excluding the failing condition
A route with different hops avoids the original failure point with slightly higher latency.
split_payment
Split payment into 250 CKB + 250 CKB
The route has only 320 CKB total forwardable capacity. After the first part, the same static route cannot carry the second part, so the full 500 CKB payment is not completed.
Report Export
Export the failure timeline, replay evidence, recommendation, and mode disclosure.