Question

我在Graphx中有以下图表

graph.vertices.foreach(println)

(6109253945443866644,"Futurama"@en)
(7558506336564503178,"AccessibleComputing"@en)
(0,null)
(-2278222762001827643,"Programming languages"@en)
(-9007336571746445204,http://dbpedia.org/resource/Category:Presocratic_philosophers)
(-3236797006683951166,http://dbpedia.org/resource/Category:Programming_languages)
(-4159090027031366209,http://dbpedia.org/resource/Anaximenes_of_Miletus)
(7722304331424482609,http://dbpedia.org/resource/Category:Futurama)
(-323898215277667127,http://dbpedia.org/resource/AccessibleComputing)

我在此图上应用了连通分量算法，其输出如下： -

ccGraph.vertices.foreach(println)

(6109253945443866644,6109253945443866644)
(7558506336564503178,-323898215277667127)
(0,0)
(-2278222762001827643,-3236797006683951166)
(-9007336571746445204,-9007336571746445204)
(-3236797006683951166,-3236797006683951166)
(-4159090027031366209,-9007336571746445204)
(7722304331424482609,6109253945443866644)
(-323898215277667127,-323898215277667127)

我找不到在ccGraph中找到（vertexID，vertexID）顶点标签/顶点名称的方法，以便输出转换为
（vertexID，vertexID）=＆gt; （vertexLabel，vertexLabel）

我尝试了以下方法，但失败了

    ccGraph.vertices.map({case arr =>  
val k1 = graph.vertices.lookup(arr(0))
val k2 = graph.vertices.lookup(arr(1))
(k1,k2)
})

<console>:51: error: (org.apache.spark.graphx.VertexId, org.apache.spark.graphx.VertexId) does not take parameters
                  ccGraph.vertices.map({case arr =>  val k1 = graph1.vertices.lookup(arr(0))
                                                                                        ^
<console>:52: error: (org.apache.spark.graphx.VertexId, org.apache.spark.graphx.VertexId) does not take parameters
                                                     val k2 = graph1.vertices.lookup(arr(1))

Answer 1

连通分量算法生成一个新图形，其顶点值设置为组件ID。如果要获得原始值，则必须将它们与原始图形连接。

ccGraph.joinVertices(graph.vertices) { (id, component_id, old_value) =>
  ...
}

Graphx从顶点id获取顶点标签

1 个答案: