kedacore/keda

MQTT - based scaler

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#1,282 opened on Oct 22, 2020

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help wantedneeds-discussionscalerstale-bot-ignore

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Description

I'd like to have a scaler listen to an MQTT source and scale up/down based on incoming messages. This would be useful for Kubernetes clusters that run on the edge (for example, in IoT scenarios and in scenarios where k8s is running on underpowered machines)

  • Scaler Source: A scaler to support scaling applications based on incoming MQTT messages. Not intended to support bidirectional communications
  • How do you want to scale: Based on volume of messages on a particular topic
  • Authentication: Two options are username/password auth and advanced (x.509) auth. username/password auth should be sufficient for now, given that you can already place credentials in a secret and pass them into a ScaledObject

Contributor guide

Research direction
Examine the existing scaler implementations (e.g., Kafka, Redis) in KEDA to understand the pattern, and then implement an MQTT scaler that subscribes to a topic and scales based on message count.
Tech stack
go
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GoMQTTKubernetes
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40