val defaultUser = (0,0,0)

val graph: Graph[(Int, Int, Int), Int] = Graph(vertexRDD, edgeRDD, defaultUser)

val subgraph = graph.subgraph(t => t.attr == 200)
val pagerankGraph = subgraph.pageRank(0.001)

def printToFile(f: java.io.File)(op: java.io.PrintWriter => Unit) {
  val p = new java.io.PrintWriter(f)
  try { op(p) } finally { p.close() }
}

import java.io._
printToFile(new File("webpages.txt")) { p =>
for (triplet <- pagerankGraph.triplets.collect) {
	 p.println(triplet.srcId+s" "+triplet.srcAttr)
}
}