Hi Ralph, you can set a vertex or edge input format when running a Giraph job. In the example, you used the vertex input format (vif)
"-vif org.apache.giraph.io.formats.JsonLongDoubleFloatDoubleVertexInputFormat" Your wikitalk input format is an edge list and Giraph offers, e.g., "org.apache.giraph.io.formats.IntNullTextEdgeInputFormat" which reads a graph where "Each line consists of: source_vertex, target_vertex" (separated by a \t) You can set the edge input format via the -eif parameter. Cheers, Martin The package "org.apache.giraph.io.formats" in giraph-core contains a lot more formats. On 11.03.2015 06:37, MengXiaodong wrote: > Hi all, > > I'm new to Giraph, now I successfully ran my first example by > following the instruction on Giraph - Quick Start. However, I met a > question when I write my own Giraph code. > > In the "quick start", The format of input graph is as following: > > [0,0,[[1,1],[3,3]]] [1,0,[[0,1],[2,2],[3,1]]] [2,0,[[1,2],[4,4]]] > [3,0,[[0,3],[1,1],[4,4]]] [4,0,[[3,4],[2,4]]] > > But the graphs (like Facebook, twitter social network) datasets > downloaded from public websites are in various format. How can I > transform a graph into the standard Giraph graph like the above > one? > > For example the WikiTalk graph as blow, which is a directed graph. > Directed edge A->B means user A edited talk page of B. > > # FromNodeId ToNodeId 0 1 2 1 2 21 2 46 2 63 2 88 2 > 93 2 94 2 101 2 > 102 2 103 2 116 2 119 2 125 > > Regards, Ralph >
