How to import a CSV file into Titan graph database?

Question

Can anyone supply some sample code or hints on how to import a 1MB CSV of nodes, and another 1MB CSV of edges, into Titan graph database running on Cassandra?

I\'ve

Answer 1

My question was answered at https://groups.google.com/forum/#!topic/aureliusgraphs/ew9PJVxa8Xw :

1) The gremlin script is fine for a 1mb import (Stephen Mallette)

2) BatchGraph code (Daniel Kuppitz)

Prerequisties:

echo "alice,32"         > /tmp/vertices.csv
echo "bob,33"          >> /tmp/vertices.csv
echo "alice,knows,bob"  > /tmp/edges.csv

In Gremlin REPL:

config = new BaseConfiguration()
config.setProperty("storage.backend", "inmemory")

g = TitanFactory.open(config)
bg = new BatchGraph(g, VertexIDType.STRING, 1000)

new File("/tmp/vertices.csv").each({ line ->
  (username, age) = line.split(",")
  user = bg.addVertex("user::" + username)
  ElementHelper.setProperties(user, ["username":username,"age":age.toInteger()])
})

new File("/tmp/edges.csv").each({ line ->
  (source, label, target) = line.split(",")

  v1 = bg.getVertex("user::" + source)
  v2 = bg.getVertex("user::" + target)

  bg.addEdge(null, v1, v2, label)
})

bg.commit()