KiteMQ is an ultra-lightweight, blazing-fast, and zero-dependency message broker written in modern Java. It speaks the Apache Kafka® protocol, allowing you to use standard Kafka clients, but does so with a fraction of the resource footprint.
Built from the ground up utilizing the latest Java 21 features: Virtual Threads (Project Loom) for massive concurrency and the Foreign Function & Memory API (Project Panama) for native OS-level zero-copy I/O.
Traditional message brokers are often heavy, require complex JVM tuning, external consensus systems (like ZooKeeper), or massive memory allocations just to boot. KiteMQ is designed to be different:
- Kafka-Compatible: Works out-of-the-box with standard Kafka clients (
Produce,Fetch,Consumer Groups,Offsets). - Zero-Copy Performance: Uses native
sendfileandmmapvia Java's FFM API. Data goes directly from the OS page cache to the network socket, bypassing the JVM heap completely. - Virtually Threaded: Handles tens of thousands of concurrent connections effortlessly using Java 21 Virtual Threads.
- Zero Dependencies: The core broker has exactly
0external runtime dependencies. - Instant Startup: Boots in milliseconds. Perfect for embedded usage, edge computing, or integration testing.
Here is a truthful comparison of KiteMQ against industry giants. We don't claim to replace a 100-node Kafka cluster, but for lightweight, high-throughput, single-node deployments, KiteMQ shines.
| Feature | 🪁 KiteMQ | 🧡 Apache Kafka® | 🔴 Redpanda |
|---|---|---|---|
| Language | Modern Java 21 | Java / Scala | C++ |
| Startup Time | ~50ms | Seconds to Minutes | Seconds |
| Memory Footprint | < 100 MB | 1 GB+ | Moderate |
| Runtime Dependencies | None | ZooKeeper / KRaft | None |
| I/O Strategy | sendfile / mmap (Zero-copy) |
sendfile (Zero-copy) |
Direct I/O (Seastar) |
| Connection Scaling | Virtual Threads | OS Threads | Thread-per-core |
| Best For | Embedded, Edge, Fast CI/CD, Lightweight Microservices | Massive distributed enterprise clusters | High-end distributed clusters |