Question

我有一个以这种方式创建的顶点和边的列表：

  val v1 = new Vertex(1L, "foo")
  val v2 = new Vertex(2L, "bar")
  val e1 = new Edge(v1, v2, 0.5)`

并希望使用Graph.fromDataSet方法（或任何其他此类问题）创建Flink图。如何在Flink可读的内容中转换这些边和顶点？

谢谢！

Answer 1

给定顶点列表val vertices: Seq[Vertex[Long, String]] = ...和边val edges: Seq[Edge[Long, String]] = ...，您可以使用Graph方法创建Graph.fromCollection：

val env = ExecutionEnvironment.getExecutionEnvironment

val vertices = Seq(new Vertex[Long, String](1L, "foo"), new Vertex[Long, String](2L, "bar"))
val edges = Seq(new Edge[Long, String](1L, 2L, "foobar"))

val graph = Graph.fromCollection(vertices, edges, env)

值得注意的是，您必须导入org.apache.flink.graph.scala.Graph的Scala版本。

或者，您也可以先使用edgeDataset: DataSet[Edge[Long, String]]创建vertexDataSet: DataSet[Vertex[Long, String]]和ExecutionEnvironment。然后可以使用Graph方法创建Graph.fromDataSet：

val vertexDataset = env.fromCollection(vertices)
val edgeDataset = env.fromCollection(edges)

val graph = Graph.fromDataSet(vertexDataset, edgeDataset, env)

Apache Flink - Gelly - 从边缘列表创建数据集

1 个答案: