An Experience Report of Large Scale

Abstract. We present an experimental study of large-scale RDF feder-ations on top of the Bio2RDF data sources, involving 29 data sets with more than four billion RDF triples deployed in a local federation. Our federation is driven by FedX, a highly optimized federation mediator for Linked Data. We discuss design decisions, technical aspects, and ex-periences made in setting up and optimizing the Bio2RDF federation, and present an exhaustive experimental evaluation of the federation sce-nario. In addition to a controlled setting with local federation members, we study implications arising in a hybrid setting, where local federation members interact with remote federation members exhibiting higher net-work latency. The outcome demonstrates the feasibility of federated se-mantic data management in general and indicates remaining bottlenecks and research opportunities that shall serve as a guideline for future work in the area of federated semantic data processing.