OK, have waded into implementing this and have gotten pretty far, but am now
hitting something I don't understand, an NoSuchMethodError.
The code looks like
[...]
val conf = new SparkConf().setAppName(appName)
//conf.set("fs.default.name", "file://");
val sc = new SparkContext(conf)
val lines = sc.textFile(inFileArg)
val foo = lines.count()
val edgeTmp = lines.map( line => line.split(" ").slice(0,3)).
// following filters omit comments, so no need to specifically
filter for comments ("#....")
filter(x => x(0).startsWith("<") && x(0).endsWith(">") &&
x(2).startsWith("<") && x(2).endsWith(">")).
map(x => Edge(hashToVId(x(0)),hashToVId(x(2)),x(1)))
edgeTmp.foreach( edge => print(edge+"\n"))
val edges: RDD[Edge[String]] = edgeTmp
println("edges.count="+edges.count)
val properties: RDD[(VertexId, Map[String, Any])] =
lines.map( line => line.split(" ").slice(0,3)).
filter(x => !x(0).startsWith("#")). // omit RDF comments
filter(x => !x(2).startsWith("<") || !x(2).endsWith(">")).
map(x => { val m: Tuple2[VertexId, Map[String, Any]] =
(hashToVId(x(0)), Map((x(1).toString,x(2)))); m })
properties.foreach( prop => print(prop+"\n"))
val G = Graph(properties, edges) /// <======== this is line 114
println(G)
The (short) traceback looks like
Exception in thread "main" java.lang.NoSuchMethodError:
org.apache.spark.graphx.Graph$.apply$default$4()Lorg/apache/spark/storage/StorageLevel;
at com.cray.examples.spark.graphx.lubm.query9$.main(query9.scala:114)
at com.cray.examples.spark.graphx.lubm.query9.main(query9.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.spark.deploy.SparkSubmit$.launch(SparkSubmit.scala:303)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:55)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Is the method that's not found (".../StorageLevel") something I need to
initialize? Using this same code on a toy problem works fine.
BTW, this is Spark 1.0, running locally on my laptop.
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