RangeDependency.md

Spark RangeDependency 区间依赖关系

• Represents a one-to-one dependency between ranges of partitions in the parent and child RDDs.

更多资源

• SPARK 源码分析技术分享(bilibilid视频汇总套装视频): https://www.bilibili.com/video/av37442139/
• github: https://github.com/opensourceteams/spark-scala-maven
• csdn(汇总视频在线看): https://blog.csdn.net/thinktothings/article/details/84726769

youtub视频演示

• https://youtu.be/_4DeWWPQubc (youtube视频)
• https://www.bilibili.com/video/av37442139/?p=2(bilibili视频)
• github: https://github.com/opensourceteams/spark-scala-maven

<iframe width="800" height="500" src="//player.bilibili.com/player.html?aid=37442139&cid=65822246&page=2" scrolling="no" border="0" frameborder="no" framespacing="0" allowfullscreen="true"> </iframe>

输入数据

c.txt

a bc
a  

a.txt

a b
c a

处理程序scala

package com.opensource.bigdata.spark.local.rdd.operation.dependency.narrow.n_02_RangeDependency

import com.opensource.bigdata.spark.local.rdd.operation.base.BaseScalaSparkContext

object Run3 extends BaseScalaSparkContext{

  def main(args: Array[String]): Unit = {
    val sc = pre()
    val rdd1 = sc.textFile("/opt/data/2/c.txt",2)
    val rdd2 = sc.textFile("/opt/data/2/a.txt",2)
    val rdd3 = rdd1.union(rdd2)

    println(rdd3.collect().mkString("\n"))

    sc.stop()
  }

}

数据处理图