Github user maropu commented on the pull request:

    https://github.com/apache/spark/pull/4650#issuecomment-74879414
  
    Please add tests for your RDF loader, and see my codes as an example:
    
https://github.com/maropu/spark/commit/cc5ac0b08ca39c3c339fdca905779bb3b037f8fa
    
    BTW, I think that it'd would be better to divide an interface and the 
implementations
    for GraphLoader because we'll possibly add the some types of GraphLoader
    for different formats in a future.
    
    e.g.,)
    - an interface
    o.a.spark.graphx.GraphLoader:
    abstract class GraphLoader {
      def edgeListFile(...)
    }
    
    - the implementations
    o.a.spark.graphx.impl.loader.LineLoader
    class LineLoader extends GraphLoader {
      def edgeListFile() = {the current implementation of 
GraphLoader#edgeListFile}
    }
    
    o.a.spark.graphx.impl.loader.RDFLoader
    class RDFLoader extends GraphLoader {
      def edgeListFile() = {your codes}
    }
    
    
    Thought?
    



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