/** {@inheritDoc} */
  @Override
  public Map<? extends GridComputeJob, GridNode> map(List<GridNode> subgrid, Integer arg)
      throws GridException {
    assert taskSes != null;
    assert arg != null;
    assert arg > 0;

    Map<GridSessionLoadTestJob, GridNode> map = new HashMap<>(subgrid.size());

    Iterator<GridNode> iter = subgrid.iterator();

    Random rnd = new Random();

    params = new HashMap<>(arg);

    Collection<UUID> assigned = new ArrayList<>(subgrid.size());

    for (int i = 0; i < arg; i++) {
      // Recycle iterator.
      if (!iter.hasNext()) iter = subgrid.iterator();

      String paramName = UUID.randomUUID().toString();

      int paramVal = rnd.nextInt();

      taskSes.setAttribute(paramName, paramVal);

      GridNode node = iter.next();

      assigned.add(node.id());

      map.put(new GridSessionLoadTestJob(paramName), node);

      params.put(paramName, paramVal);

      if (log.isDebugEnabled())
        log.debug("Set session attribute [name=" + paramName + ", value=" + paramVal + ']');
    }

    taskSes.setAttribute("nodes", assigned);

    return map;
  }