Most of the existing reachability indices perform well on small- to medium- size graphs, but reach a scalability bottleneck around one million vertices/edges. As graphs become increasingly large, scalability is quickly becoming the major research challenge for the reachability computation today. Can we construct indices which scale to graphs with tens of millions of vertices and edges? Can the existing reachability indices which perform well on moderate-size graphs be scaled to very large graphs? In this paper, we propose SCARAB (standing for SCAlable ReachABility), a unified reachability computation framework: it not only can scale the existing state-of-the-art reachability indices, which otherwise could only be constructed and work on moderate size graphs, but also can help speed up the online query answering approaches.
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