envoyproxy/envoy

Unconditional hedged requests

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#20,036 opened on Feb 18, 2022

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area/routerhelp wanted

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Description

At the moment Envoy proxy supports hedged request with per timeout policy.

In our case we need to send multiple requests simultaneously (3 identical requests to 3 different backends for example) and get one fastest response.

The number of parallel requests needs to be configured from config

Is it possible to implement it in Envoy ?

Contributor guide

Research direction
Examine the existing hedged request implementation in Envoy and understand the per timeout policy. Then design a configuration option for unconditional parallel requests, considering how to manage multiple identical requests and select the fastest response.
Tech stack
cpp
Domain
networkingbackend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C++Envoy architecturegRPC
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
15