envoyproxy/envoy

Load balancer: Pluggable subsetting for load balancers

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#17,013 opened on Jun 16, 2021

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area/load balancingdesign proposalhelp wanted

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Description

Title: Load balancer: Pluggable subsetting for load balancers

Description: We would like to have a pluggable component for feeding the subset of endpoints that feeds into the load balancer system such that it allows different subsetting schemes like deterministic subsetting. This will keep the load balancing scheme decoupled from the subsetting scheme. Without a pluggable subsetting scheme, looks like we currently only have a cluster priority based subset.

[Relevant Links:] https://blog.twitter.com/engineering/en_us/topics/infrastructure/2019/daperture-load-balancer

Contributor guide

Research direction
Investigate existing subsetting implementation in Envoy, particularly the load balancer subsystem. Identify current subset selection logic and propose an interface for pluggability. Refer to the Twitter blog for deterministic subsetting ideas.
Tech stack
cpp
Domain
backendinfrastructure
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.
Mostly clear
Prerequisites
GitC++
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25