.NET for Apache Spark™ 教程 | 10 分钟入门

using Microsoft.Spark.Sql;

namespace MySparkApp
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create a Spark session
            SparkSession spark = SparkSession
                .Builder()
                .AppName("word_count_sample")
                .GetOrCreate();

            // Create initial DataFrame
            DataFrame dataFrame = spark.Read().Text("input.txt");

            // Count words
            DataFrame words = dataFrame
                .Select(Functions.Split(Functions.Col("value"), " ").Alias("words"))
                .Select(Functions.Explode(Functions.Col("words"))
                .Alias("word"))
                .GroupBy("word")
                .Count()
                .OrderBy(Functions.Col("count").Desc());

            // Show results
            words.Show();

            // Stop Spark session
            spark.Stop();
        }
    }
}