Update ShortestPath to work with controllable partitioning

bagel/src/main/scala/bagel/ShortestPath.scala

@@ -5,7 +5,6 @@ import spark.SparkContext._
 
 import scala.math.min
 
-/*
 object ShortestPath {
   def main(args: Array[String]) {
     if (args.length < 4) {
@@ -26,7 +25,7 @@ object ShortestPath {
        .filter(!_.matches("^\\s*#.*"))
        .map(line => line.split("\t")))
 
-    val vertices: RDD[(String, Either[SPVertex, SPMessage])] =
+    val vertices: RDD[(String, SPVertex)] =
       (lines.groupBy(line => line(0))
        .map {
          case (vertexId, lines) => {
@@ -35,18 +34,16 @@ object ShortestPath {
                new SPEdge(targetId, edgeValue.toInt)
            }
            
-           (vertexId, Left[SPVertex, SPMessage](new SPVertex(vertexId, Int.MaxValue, outEdges, true)))
+           (vertexId, new SPVertex(vertexId, Int.MaxValue, outEdges, true))
          }
        })
 
-    val messages: RDD[(String, Either[SPVertex, SPMessage])] =
+    val messages: RDD[(String, SPMessage)] =
       (lines.filter(_.length == 2)
        .map {
          case Array(vertexId, messageValue) =>
-           (vertexId, Right[SPVertex, SPMessage](new SPMessage(vertexId, messageValue.toInt)))
+           (vertexId, new SPMessage(vertexId, messageValue.toInt))
        })
-
-    val graph: RDD[(String, Either[SPVertex, SPMessage])] = vertices ++ messages
     
     System.err.println("Read "+vertices.count()+" vertices and "+
                        messages.count()+" messages.")
@@ -55,7 +52,7 @@ object ShortestPath {
     def messageCombiner(minSoFar: Int, message: SPMessage): Int =
       min(minSoFar, message.value)
 
-    val result = Pregel.run(sc, graph, numSplits, messageCombiner, () => Int.MaxValue, min _) {
+    val result = Pregel.run(sc, vertices, messages, numSplits, messageCombiner, () => Int.MaxValue, min _) {
       (self: SPVertex, messageMinValue: Int, superstep: Int) =>
         val newValue = min(self.value, messageMinValue)
 
@@ -83,4 +80,3 @@ object ShortestPath {
 @serializable class SPVertex(val id: String, val value: Int, val outEdges: Seq[SPEdge], val active: Boolean) extends Vertex
 @serializable class SPEdge(val targetId: String, val value: Int) extends Edge
 @serializable class SPMessage(val targetId: String, val value: Int) extends Message
-*/