smart-mqtt v1.4.0 Packs Under 800KB While Handling 10 Million Messages per Second

Core Highlights

Package slimming – deep Maven dependency analysis reduced the open‑source distribution from 3 MB to under 800 KB, a 73 % size drop that speeds download, deployment and startup.

Configuration overhaul – the legacy smart-mqtt.yaml file is removed; all settings are now supplied via system properties ( -D flags) or environment variables, aligning with Twelve‑Factor App principles and simplifying cloud‑native deployment.

Performance Test Findings

Test environment upgrade

The benchmark switched from Docker to Podman while keeping identical server hardware and using the same MQTT load‑testing toolset.

QoS0 throughput – 1 000 000 msg/s in Podman, 200 000 msg/s higher than the 800 000 msg/s observed in Docker.

QoS1/2 performance – throughput increased by more than one million messages per second compared with the previous version.

Resource efficiency – CPU and memory usage were further optimized.

Feature Refactoring Details

Memory optimization

Re‑engineered the topic‑tree storage to reduce redundant object creation.

Optimized subscription reference management to lower memory overhead.

Introduced intelligent cache‑reuse strategies, reducing GC pressure.

Improved memory efficiency for large‑scale connection scenarios.

Maven dependency restructuring

Deeply analyzed project dependencies and removed unnecessary transitive dependencies.

Optimized dependency scope declarations to cut runtime dependencies.

Unified version management to avoid conflicts.

Improved build speed and runtime performance.

Logging system enhancements

Refined log output format for better readability.

Adjusted log‑level configuration to aid debugging.

Boosted logging performance and reduced I/O overhead.

Added richer context information to simplify issue tracing.

Plugin improvements

Cluster plugin – stabilized reconnection logic, refined fault detection, and improved node‑state synchronization for large‑scale clusters.

Enterprise plugin – added self‑healing mechanisms, automatic restart on service failures, health‑check configuration, and storage‑structure optimizations for higher data consistency and reliability.

Marketplace migration – relocated the plugin market to a new service address, delivering faster, more stable access and streamlined download, installation, and update processes.

Technical Metrics Comparison

Package size: 3 MB → 800 KB (‑73 %).

Configuration method: YAML file → environment variables / system properties (modernized).

Memory usage: reduced by 30‑40 %.

Deployment complexity: medium → simple.

Acquisition

Download links

GitHub Releases: https://github.com/smartboot/smart-mqtt/releases/tag/v1.4.0

Gitee Releases: https://gitee.com/smartboot/smart-mqtt/releases/v1.4.0

Docker deployment

docker run --name smart-mqtt \
  -p 1883:1883 \
  -p 18083:18083 \
  -d smartboot/smart-mqtt:latest

Future Outlook

Deepening cloud‑native support – further enhancements to Kubernetes Operator and Helm Chart integration.

Continuous performance tuning – ongoing exploration of additional optimizations.

Observability – expanded metrics, tracing, and logging capabilities.

Plugin ecosystem – development of more enterprise‑grade plugins and richer functionality.

Developer experience – improvements to documentation, toolchain and overall usability.