We want to present our data in a graph and thought about using one of graphdbs. During our vendor investigation process, one of the experts suggested that using graphdb on dense graph won't be efficient and we'd better off with columnar-based db like cassandra.
I gave your use case some thought and given your graph is very dense (number of relationships = number of nodes squared) and that you seem to only need a few hop traversals from the particular node along different relationships. I’d actually recommend you also try out a columnar database. Graph databases tend to work well when you have sparse graphs (num of relationships << num of nodes ^ 2) and with deep traversals - from 4-5 hops to hundreds of hops. If I understood your use-case correctly, a columnar database should generally outperform graphs there. Our use case will probably end up with nodes connected to 10s of millions of other nodes with about 30% overlap between different nodes - so in a way, it's probably a dense graph. Overall there will be probably a few billion nodes. Looking in Neo4j source code I found some reference of isDense flag on the nodes to differentiate the processing logic - not sure what that does. But I also wonder whether it was done as an edge case patch and won't work well if most of the nodes in the graph are dense. Does anyone have any experience with graphdbs on dense graphs and should it be considered in such cases? I saw a few issues over the years both on Titan and Neo4j threads, which seemed to be taken into considerations by the development teams. But, again, not sure was is it an edge case patch or a real scalable solution. Like here <https://www.datastax.com/dev/blog/a-solution-to-the-supernode-problem>, "supernode" is a vertex with a disproportionately high number of incident edges. While supernodes are *rare* in natural graphs... In our case it's not so rare. All opinions are appreciated! -- You received this message because you are subscribed to the Google Groups "ArangoDB" group. To unsubscribe from this group and stop receiving emails from it, send an email to arangodb+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
