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我最近開始使用火花。目前我正在測試具有不同頂點和邊緣類型的二分圖。火花圖形x多種邊緣類型
從我在graphx中做的研究得到不同的邊和一些有屬性的我需要子類的邊。
下面是代碼片段:
scala> trait VertexProperty
defined trait VertexProperty
scala> case class paperProperty(val paperid: Long, val papername: String, val doi: String, val keywords: String) extends VertexProperty
defined class paperProperty
scala> case class authorProperty(val authorid: Long, val authorname: String) extends VertexProperty
defined class authorProperty
scala> val docsVertces: RDD[(VertexId, VertexProperty)] = docs.rdd.map(x => (x(0).asInstanceOf[VertexId],paperProperty(x(0).asInstanceOf[VertexId],x(1).asInstanceOf[String],x(2).asInstanceOf[String],x(3).asInstanceOf[String])))
docsVertces: org.apache.spark.rdd.RDD[(org.apache.spark.graphx.VertexId, VertexProperty)] = MapPartitionsRDD[23] at map at <console>:47
scala> val authorVertces: RDD[(VertexId, VertexProperty)] = authors.rdd.map(x => (x(0).asInstanceOf[VertexId],authorProperty(x(0).asInstanceOf[Long],x(1).asInstanceOf[String])))
authorVertces: org.apache.spark.rdd.RDD[(org.apache.spark.graphx.VertexId, VertexProperty)] = MapPartitionsRDD[24] at map at <console>:41
scala> val vertices = VertexRDD(docsVertces ++ authorVertces)
vertices: org.apache.spark.graphx.VertexRDD[VertexProperty] = VertexRDDImpl[28] at RDD at VertexRDD.scala:57
scala>
但是我與邊緣失敗。
scala> class EdgeProperty()
defined class EdgeProperty
scala> case class authorEdgeProperty(val doccount: Long) extends EdgeProperty()
defined class authorEdgeProperty
scala> case class citeEdgeProperty() extends EdgeProperty()
defined class citeEdgeProperty
scala> // edge using subclass will not work we need to have one consistent superclass
scala> val docauthoredges = docauthor.map(x => Edge(x(0).asInstanceOf[VertexId],x(1).asInstanceOf[VertexId], authorEdgeProperty(x(1).asInstanceOf[Long])))
docauthoredges: org.apache.spark.sql.Dataset[org.apache.spark.graphx.Edge[authorEdgeProperty]] = [srcId: bigint, dstId: bigint ... 1 more field]
scala> val docciteedges = doccites.map(x => Edge(x(0).asInstanceOf[VertexId],x(1).asInstanceOf[VertexId], citeEdgeProperty()))
docciteedges: org.apache.spark.sql.Dataset[org.apache.spark.graphx.Edge[citeEdgeProperty]] = [srcId: bigint, dstId: bigint ... 1 more field]
scala> docauthoredges.unionAll(docciteedges)
<console>:52: error: type mismatch;
found : org.apache.spark.sql.Dataset[org.apache.spark.graphx.Edge[citeEdgeProperty]]
required: org.apache.spark.sql.Dataset[org.apache.spark.graphx.Edge[authorEdgeProperty]]
docauthoredges.unionAll(docciteedges)
^
scala>
我試圖邊緣投射到他們的父和我recieving以下消息:
scala> val docauthoredges = docauthor.map(x => Edge(x(0).asInstanceOf[VertexId],x(1).asInstanceOf[VertexId], authorEdgeProperty(x(1).asInstanceOf[Long]).asInstanceOf[EdgeProperty]))
java.lang.UnsupportedOperationException: No Encoder found for EdgeProperty
- field (class: "EdgeProperty", name: "attr")
- root class: "org.apache.spark.graphx.Edge"
at org.apache.spark.sql.catalyst.ScalaReflection$.org$apache$spark$sql$catalyst$ScalaReflection$$serializerFor(ScalaReflection.scala:598)
...
任何幫助,將不勝感激