May 2017
Intermediate to advanced
294 pages
7h 33m
English
Content preview from Apache Spark 2.x Cookbook
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How to do it...
- Import the graphx related classes:
scala> import org.apache.spark.graphx._
- Load the edges from Amazon S3:
scala> val edgesFile = sc.textFile( "s3a://com.infoobjects.wiki/links",20)
The links file has links in the sourcelink: link1 link2 ... format.
- Flatten and convert edgesFile into an RDD of link1, link2 format, and then convert it into an RDD of Edge objects:
scala> val edges = edgesFile.flatMap { line => val links = line.split("\\W+") val from = links(0) val to = links.tail for ( link <- to) yield (from,link) }.map( e => Edge(e._1.toLong,e._2.toLong,1))
Use the paste to copy multi-line code, and then execute using Ctrl+D.
- Load the edges from Amazon S3:
scala> val verticesFile = sc.textFile ("s3a://com.infoobjects.wiki/nodes",20) ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.