withSpout在spark中是用来做DAG可视化的，它在代码里的用法如下（以map为例，spark2.0.0版本）defmap[U:ClassTag](f:T=>U):RDD[U]=withScope{valcleanF=sc.clean(f)newMapPartitionsRDD[U,T](this,(co...

1.下载scala到scala官网下载scalahttps://www.scala-lang.org/download/，目前最新版本是2.12.8wgethttps://downloads.lightbend.com/scala/2.12.8/scala-2.12.8.tgz#downloadscalabinaryf...

 SoftwareScalabilitywithMapReduceCraig HendersonFirstpublishedonlineApril2010Thearchitectureofa software systemisthestructureanddesignofthec...