1 files changed, 43 insertions, 0 deletions
diff --git a/examples/src/main/scala/org/apache/spark/examples/SparkPi.scala b/examples/src/main/scala/org/apache/spark/examples/SparkPi.scala
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+++ b/examples/src/main/scala/org/apache/spark/examples/SparkPi.scala
@@ -0,0 +1,43 @@
+/*
+ * 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
+
+import scala.math.random
+import org.apache.spark._
+import SparkContext._
+
+/** Computes an approximation to pi */
+object SparkPi {
+  def main(args: Array[String]) {
+    if (args.length == 0) {
+      System.err.println("Usage: SparkPi <master> [<slices>]")
+      System.exit(1)
+    }
+    val spark = new SparkContext(args(0), "SparkPi",
+      System.getenv("SPARK_HOME"), Seq(System.getenv("SPARK_EXAMPLES_JAR")))
+    val slices = if (args.length > 1) args(1).toInt else 2
+    val n = 100000 * slices
+    val count = spark.parallelize(1 to n, slices).map { i =>
+      val x = random * 2 - 1
+      val y = random * 2 - 1
+      if (x*x + y*y < 1) 1 else 0
+    }.reduce(_ + _)
+    println("Pi is roughly " + 4.0 * count / n)
+    System.exit(0)
+  }
+}