To end the first day slot of  the morning presentations during last 6th TUC Meeting in Barcelona Claudio Martella from VUA was presenting Lighthouse: Large-scale graph pattern matching on Giraph. 

The presentation starts giving a quick overview about Pregel and Apache Giraph to then move to the specifics of Lighthouse and how it was created to use high-level languages to express the graph pattern algorithms (instead of Java). Lighthouse uses Cypher query language (from Neo4j) to express graph patterns, extracting a query graph from the Cypher query and computing a query plan based on Giraph algebra and executed as Giraph computation on Hadoop cluster. 

Watch Claudio Martella presenting Lighthouse's Giraph execution algebra in detail:

Stay tuned for the second day of presentations posts!