valkey-io/iovalkey

Implement az-affinity-strategy

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#23 opened on Jan 13, 2025

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good first issue

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Description

By implementing AZ affinity routing in valkeyio, we can achieve lower latency and cost savings by routing requests to replicas in the same availability zone as the client. This is available in Valkey 8.

https://valkey.io/blog/az-affinity-strategy/

Some additional notes:

  • How does it know which replicas are the closest?

Generally speaking it is a free text. You can think of it as route based on replica name. For example, the user can configure the name "This replica likes Shakshouka" and route the client only to replicas that has this text. The user has to configure the names at the server side and the client side. For managed service the name may be auto configured by the server. But, as client maintainer you should not care about that in your implementation. (from this discussion)

Contributor guide

Research direction
Investigate Valkey 8's AZ affinity strategy from the blog post and Slack discussion. Understand how replica names are configured server side and how the client can select replicas based on a configured text. Implement a mechanism to pass the AZ affinity string to the client and route requests to matching replicas.
Tech stack
typescript
Domain
backendapidistributed systems
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.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
TypeScriptValkey knowledge
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35