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...
- Load the spark-shell:
$ spark-shell
- Import the graphx related classes:
scala> import org.apache.spark.graphx._
- Load the edges from hdfs:
scala> val edgesFile = sc.textFile( "hdfs://localhost:9000/user/hduser/data/cc/edges.csv")
- Convert the edgesFile RDD into the RDD of edges:
scala> val edges = edgesFile.map(_.split(",")).map(e => Edge(e(0).toLong,e(1).toLong,e(2)))
- Load the vertices from HDFS:
scala> val verticesFile = sc.textFile( "hdfs://localhost:9000/user/hduser/data/cc/nodes.csv")
- Map the vertices:
scala> val vertices = verticesFile.map(_.split(",")).map( e => (e(0).toLong,e(1)))
- Create the graph object:
scala> val graph = Graph(vertices,edges)
- Calculate the connected components using ...
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