Practical Real-time Data Processing and Analytics

Graph transformations

The following are some important graph transformations:

• map: map transformation can be applied on the vertex or edge. The ID's of the vertex and edge remain unchanged and you can change the value as per the user-defined function:

Graph<Long, Long, Long> updatedGraph = graph.mapVertices(new MapFunction<Vertex<Long, Long>, Long>() {public Long map(Vertex<Long, Long> value) {return value.getValue() + 1;}});

• filter: By using filter, you can filter the vertices or edges from the graph. If filter is applied on the edges, then the filtered edges will remain in the graph but the vertices will not be removed. If filter is applied on the vertices, then the filtered vertices will remain in the graph:

graph.subgraph(new FilterFunction<Vertex<Long, ...