Add LiveJournalPageRank example

examples/src/main/scala/org/apache/spark/examples/graphx/LiveJournalPageRank.scala

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.examples.graphx
+
+import org.apache.spark.SparkContext._
+import org.apache.spark._
+import org.apache.spark.graphx._
+import org.apache.spark.graphx.lib.Analytics
+
+/**
+ * Uses GraphX to run PageRank on a LiveJournal social network graph. Download the dataset from
+ * http://snap.stanford.edu/data/soc-LiveJournal1.html.
+ */
+object LiveJournalPageRank {
+  def main(args: Array[String]) {
+    if (args.length < 2) {
+      System.err.println(
+        "Usage: LiveJournalPageRank <master> <edge_list_file>\n" +
+          "    [--tol=<tolerance>]\n" +
+          "        The tolerance allowed at convergence (smaller => more accurate). Default is " +
+          "0.001.\n" +
+          "    [--output=<output_file>]\n" +
+          "        If specified, the file to write the ranks to.\n" +
+          "    [--numEPart=<num_edge_partitions>]\n" +
+          "        The number of partitions for the graph's edge RDD. Default is 4.\n" +
+          "    [--partStrategy=RandomVertexCut | EdgePartition1D | EdgePartition2D | " +
+          "CanonicalRandomVertexCut]\n" +
+          "        The way edges are assigned to edge partitions. Default is RandomVertexCut.")
+      System.exit(-1)
+    }
+
+    Analytics.main(args.patch(1, List("pagerank"), 0))
+  }
+}