Building a GraphHopper + jsprit Routing Integration (Bachelor Project)

Open Source Routing Engine
1

Hi everyone!

I am a computer science student currently planning my Bachelor’s final thesis. My project goal is to build a self-hosted routing and route optimization service inspired by the GraphHopper Directions API, integrating GraphHopper (for route calculation and distance matrices) with jsprit (for solving Vehicle Routing Problems).

Before I lock in my project architecture, I would love to get some feedback from the community regarding hardware sizing and integration complexity:

  1. AWS Instance Sizing (EU Map): I plan to process the full OpenStreetMap extract for Europe supporting three profiles: car, truck, and small_truck. Would an AWS r6a.2xlarge instance (8 vCPUs, 64 GB RAM) be sufficient for building and running the graph, or is 64 GB likely to bottleneck with these three profiles?

  2. Integration Complexity (Java): For anyone who has integrated the two libraries natively: how much development effort is typically involved in piping GraphHopper’s matrix calculations (distances/durations) into jsprit’s VehicleRoutingTransportCosts matrix? Are there known performance traps or recommended patterns when translating GraphHopper matrix outputs into jsprit problem definitions?

Any advice, hardware recommendations, or architectural pointers would be hugely appreciated!

Thanks in advance!

Tibe