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Add ShortestPaths to Analytics #1

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Add ShortestPaths to Analytics #1

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41 changes: 41 additions & 0 deletions graphx/src/main/scala/org/apache/spark/graphx/lib/Analytics.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,8 @@

package org.apache.spark.graphx.lib

import scala.collection.mutable.ArrayBuffer

import org.apache.spark._
import org.apache.spark.graphx._
import org.apache.spark.graphx.PartitionStrategy._
Expand Down Expand Up @@ -146,6 +148,45 @@ object Analytics extends Logging {
}.reduce(_ + _) / 3)
sc.stop()

case "ShortestPaths" =>
var numEPart = 4
var partitionStrategy: Option[PartitionStrategy] = None
val landmarks: ArrayBuffer[VertexId] = ArrayBuffer.empty
var outFname = ""
options.foreach{
case ("numEPart", v) => numEPart = v.toInt
case ("partStrategy", v) => partitionStrategy = Some(pickPartitioner(v))
case ("landmark", v) => landmarks += v.toLong
case ("output", v) => outFname = v
case (opt, _) => throw new IllegalArgumentException("Invalid option: " + opt)
}
println("======================================")
println("| Shortest Paths |")
println("======================================")

if (landmarks.isEmpty) {
println("Specify landmarks by passing --landmark=<VERTEX_ID> one or more times.")
sys.exit(1)
}

val sc = new SparkContext(host, "ShortestPaths(" + fname + ")", conf)
val unpartitionedGraph = GraphLoader.edgeListFile(sc, fname,
minEdgePartitions = numEPart).cache()
val graph = partitionStrategy.foldLeft(unpartitionedGraph)(_.partitionBy(_))
val distances = ShortestPaths.run(graph, landmarks)

if (outFname.nonEmpty) {
println("Writing output in 'vid<TAB>landmark<TAB>distance' format to " + outFname)
distances.vertices.flatMap {
case (vid: VertexId, d: ShortestPaths.SPMap) => d.iterator.map {
case (landmark: VertexId, distance: Int) =>
"%d\t%d\t%d".format(vid, landmark, distance)
}
}.saveAsTextFile(outFname)
}

sc.stop()

case _ =>
println("Invalid task type.")
}
Expand Down