envoyproxy/envoy

Implement Weighted Random Selection Queue (WRSQ) load balancing

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#14,597 opened on Jan 7, 2021

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area/load balancinghelp wanted

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Description

See https://github.com/envoyproxy/envoy/issues/14360#issuecomment-744092787 and https://github.com/tonya11en/envoy/pull/1#issuecomment-744085044. This will require https://github.com/envoyproxy/envoy/pull/14569 to be merged and https://github.com/envoyproxy/envoy/issues/14360 to be resolved.

We should use WRSQ for:

  • Weighted priority picking
  • Weighted locality picking
  • WRR host picking

We will still use EDF for WLR host picking or any other future picking in which weights can and do rapidly change.

cc @tonya11en @antoniovicente @htuch @snowp

Contributor guide

Research direction
Investigate the referenced issues and PRs to understand the WRSQ algorithm and how to integrate it into Envoy's load balancing.
Tech stack
cpp
Domain
backend
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.
3-5 days
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.
35