Component Composition for High-Bandwidth Pipelines

Source: ros2-copilot-skills component composition skill

Why This Matters

As soon as a robot processes images, depth data, or large point clouds, process boundaries start costing real time. Composition exists so related nodes can share a process and avoid avoidable serialization overhead.

Distilled Takeaways

• Composition is most valuable for high-bandwidth pipelines and tightly coupled processing chains.
• Component-style nodes must be authored intentionally, especially around NodeOptions, shared-library builds, and registration macros.
• Composition improves transport efficiency, but it also changes isolation, lifecycle, and observability tradeoffs.
• Container choice matters because executor behavior still governs callback scheduling inside the process.
• Composition and intra-process communication are related but not identical ideas.

Practical Guidance

• Start composing the parts of the graph that are bandwidth-heavy and operationally coupled.
• Keep the option to run a standalone executable when development or failure isolation still matters.
• Treat launch-time composition as architecture, not as a last-minute optimization switch.
• Use composition where the pipeline shape is stable enough to justify the tighter coupling.

Corroborating References

• ROS 2 composition concepts
• ROS 2 component tutorial

When to Read the Original Source

Go to the original skill when you want full component examples, launch container patterns, CLI loading commands, and the precise warnings around constructors, shared libraries, and component registration.