How to sort data in spark streaming

Question

I am new to spark, and try to write some example code base on spark and spark streaming.

So far, I have implemented sorting function in spark, here is the code:

  def sort(listSize: Int, slice: Int): Unit = {
    val conf = new SparkConf().setAppName(getClass.getName)
    val spark = new SparkContext(conf)
    val data = genRandom(listSize)
    val distData = spark.parallelize(data, slice)
    val result = distData.sortBy(x => x, true)
    val finalResult = result.collect()
    val step5 = System.currentTimeMillis()
    printlnArray(finalResult, 0, 10)
    spark.stop()
  }

  /**
   * generate random number
   * @return
   */
  def genRandom(listSize: Int): List[Int] = {
    val range = 100000
    var listBuffer = new ListBuffer[Int]
    val random = new Random()
    for (i <- 1 to listSize) listBuffer += random.nextInt(range)
    listBuffer.toList
  }

  def printlnArray(list: Array[Int], start: Int, offset: Int) {
    for (i <- start until start + offset) println(">>>>>>>>> list : " + i + " | " + list(i))
  }

I have a trouble on implementing sort function on spark streaming. As I know, spark RDD provide sort API in spark core, but there is not such API in spark streaming, Do anyone know how to do it ? Thanks

This is a dump question, but after google on web, I does not find an right answer. If anyone know how to solve it, thanks for your help.

Answer 1

You can leverage the transform function of a DStream to transform it by using the underlying RDDs.

For instance

myDStream.transform(rdd => rdd.sortByKey())