@Override
 protected void preSubmit() throws Exception {
   verticesPath =
       createTempFile(
           "vertices.txt", ConnectedComponentsData.getEnumeratingVertices(NUM_VERTICES));
   edgesPath =
       createTempFile(
           "edges.txt",
           ConnectedComponentsData.getRandomOddEvenEdges(NUM_EDGES, NUM_VERTICES, SEED));
   resultPath = getTempFilePath("results");
 }