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Hedged request.

also: hedged requests · request hedging · backup request · backup requests

If a request hasn't answered by about the P95 time, send a duplicate to another server and use whichever replies first.

the two-minute refresher

Send to server A; wait the P95 time; if nothing, also send to B; take the first answer and cancel the other.
It cuts tail latency for a few percent extra load.
Only for idempotent (safe to repeat) requests.

Where the course teaches it

W02 · Day 1Timeout Helllearn it →W02 · Day 1Timeout Hellrevisit →

Related concepts

P99 latency
Idempotency