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Timeout Chain Planner
Plan timeout budgets across a chain of service calls so the whole request fails faster than the client gives up.
EngineeringBackendReliabilityArchitecture
2000ms
Hop 1
1500ms
0×
Worst case: 1,500ms
Hop 2
1000ms
1×
Worst case: 2,000ms — 1 try + 1 retry × 1,000ms
Hop 3
600ms
1×
Worst case: 1,200ms — 1 try + 1 retry × 600ms
Hop 4
300ms
0×
Worst case: 300ms
4 of 6 hops
Total chain budget
5,000ms
sum of every hop's worst case
Client timeout
2,000ms
Margin
-3,000ms
First hop to blow the budget
API
2,000ms of the total
What happened
Even split across 4 hops: about 425ms of client budget each, before dividing by each hop's own retries.
Why
Splitting the client's timeout evenly across every hop -- then shrinking each hop's own timeout to fit its retry count -- keeps any single slow hop from silently eating the whole budget, and holds back about 15% as headroom. It's a planning aid, a sane starting split, not an exact optimizer.
The client gives up at 2,000ms, but the chain's own worst-case timeouts allow it to keep working until 5,000ms. That's wasted work at best -- at worst the client has already retried, and now two requests are running for the same thing.
✕
"API" eats the whole remaining budget on its own
By the time the chain reaches API, only 500ms of the client's patience is left -- but API's own timeout is 1,000ms, before any retries. One slow attempt here and the client has already given up.
⚠
"API"'s retries leave no safety margin
API retries 1× at 1,000ms each -- 2,000ms worst case is only 0% under the client's 2,000ms timeout, and every other hop still has to run.
Understand Timeout Chain Planner
What this tool helps you understand
Lay out a chain of dependent service calls and set a timeout for each — this shows whether the sum of your timeouts actually stays under the client's own timeout, and where the budget is being wasted.
When to use it
Use Timeout Chain Planner when engineering, backend, and reliability work raises questions about timeout budget, service chain timeout, and request timeout planning and you need a concrete view before making the next move.
How to read the result
Use the calculated fit, spacing, timing, or risk as a planning baseline, then verify it against the physical, commercial, or technical constraints of the real project.
Assumptions and limits
Results are estimates based on the entered assumptions. Supplier specifications, team constraints, tolerances, and real-world conditions may require a different final plan.
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