doc/scala/Spark.ipynb

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    "# Spark\n",
    "\n",
    "[Apache Spark](https://spark.apache.org/) is a lightning-fast cluster computing API based on Scala.\n",
    "This notebook shows how you can load and use Spark just like any other library.\n",
    "There is also a [Spark Magic](SparkUI.ipynb) that enables deeper integration."
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    "%classpath add mvn org.apache.spark spark-sql_2.11 2.2.1\n",
    "org.apache.log4j.Logger.getRootLogger().setLevel(org.apache.log4j.Level.ERROR);"
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   "source": [
    "import org.apache.spark.sql.SparkSession\n",
    "\n",
    "val spark = SparkSession.builder()\n",
    "                        .appName(\"Simple Application\")\n",
    "                        .master(\"local[4]\")\n",
    "                        .config(\"spark.ui.enabled\", \"false\")\n",
    "                        .getOrCreate()"
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   "source": [
    "val NUM_SAMPLES = 10000000\n",
    "val random = new scala.util.Random()\n",
    "val count = spark.sparkContext.parallelize(1 to NUM_SAMPLES).map{i =>\n",
    "  val x = random.nextDouble()\n",
    "  val y = random.nextDouble()\n",
    "  if (x*x + y*y < 1) 1 else 0\n",
    "}.reduce(_ + _)\n",
    "\n",
    "println(\"Pi is roughly \" + 4.0 * count / NUM_SAMPLES)"
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "spark.stop()"
   ]
  },
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