Loading GraphSON data 

How to use the DSE Graph Loader to load GraphSON data.

The data mapping script for GraphSON data is shown with explanation. The full script is found at the bottom of the page.
Note: DSE Graph Loader can load GraphSON files generated with TinkerGraph, the in-memory graph database included with Apache TinkerPop. GraphSON files generated with DSE Graph cannot be loaded using DSE Graph Loader.

Procedure

  • If desired, add configuration to the mapping script.
  • Specify the data input file. The variable inputfiledir specifies the directory for the input file. The identified file will be used for loading.
    // DATA INPUT
    // Define the data input source 
    // inputfiledir is the directory for the input files 
    
    inputfiledir = '/tmp/GraphSON/'
    recipeInput = Graph.file(inputfiledir + 'recipe.json').graphson()
    If the GraphSON input file is generated from DSE Graph, an additional step dse()will allow the input data to be streamed, facilitating large file transfers.
    // DATA INPUT
    // Define the data input source 
    // inputfiledir is the directory for the input files 
    
    inputfiledir = '/tmp/GraphSON/'
    recipeInput = Graph.file(inputfiledir + 'recipe.json').graphson().dse()
  • The file is specified as a json file and an additional step graphson() identifies that the file should be processed as a GraphSON file. A map, recipeInput, is created that will be used to process the data.
    recipeInput = Graph.file(inputfiledir + 'recipe.json')

    Note that Graph.file is used, in contrast to File.csv or File.json.

  • Create the main body of the mapping script. This part of the mapping script is the same regardless of the file format, although GraphSON files use a slightly modified version.
  • To run DSE Graph Loader for GraphSON loading as a dry run, use the following command:
    $ graphloader recipeMappingGraphSON.groovy -graph testGraphSON -address localhost -dryrun true

    For testing purposes, the graph specified does not have to exist prior to running graphloader. However, for production applications, the graph and schema should be created prior to using graphloader.

  • The full loading script is shown:
    // SAMPLE INPUT
    // GraphSON file is a JSON-like file
    //
    
    // CONFIGURATION
    // Configures the data loader to create the schema
    
    config create_schema: true, load_new: true
    
    // DATA INPUT
    // Define the data input source 
    // inputfiledir is the directory for the input files 
    
    inputfiledir = '/tmp/GraphSON/'
    recipeInput = Graph.file(inputfiledir + 'recipe.json').graphson()
    
    // Specifies what data source to load using which mapper (as defined inline)
      
    load(recipeInput.vertices()).asVertices {
        labelField "~label"
        key "~id", "id"
    }
    
    load(recipeInput.edges()).asEdges {
        labelField "~label"
        outV "outV", {
            labelField "~label"
            key "~id", "id"
        }
        inV "inV", {
            labelField "~label"
            key "~id", "id"
        }
    }