Hi Harsh, It's currently not possible to combine multiple vertex values, but it is on our roadmap. For now, you could try using MapReduce to aggregate those values before you feed them to the Giraph job.
Alessandro From: Harsh Rathi <harsh.c...@gmail.com<mailto:harsh.c...@gmail.com>> Reply-To: "user@giraph.apache.org<mailto:user@giraph.apache.org>" <user@giraph.apache.org<mailto:user@giraph.apache.org>> Date: Tuesday, July 9, 2013 12:24 AM To: "user@giraph.apache.org<mailto:user@giraph.apache.org>" <user@giraph.apache.org<mailto:user@giraph.apache.org>> Subject: Regarding multiple values of a vertex Hi All, I am taking input graph in the form of 2 separate files "Edge-List" and "Vertex-List". In Vertex-List file, a vertex can have multiple values (value of vertex is of text format) i.e. there can be multiple entries of vertex-value pair for same vertex. While taking input of a vertex in Giraph, it checks whether if vertex is already present in graph, then it replaces the old value with new value of vertex. I want to append all the vertex values for the same vertex (String format). I can do it by changing the giraph-core's source code. But, I am looking for a solution in which while taking input using vertex-input class, it is possible retrieve old value of that vertex. Is it possible to do what I am proposing ? Can I retrieve the value of vertex using Vertex Id in vertex-input class ? Thanks Harsh Rathi IIT Delhi
