$(document).ready(function () {
            var oTable = $('#data').dataTable({
                "bJQueryUI": true,
                "bProcessing": true,
                "bServerSide": true,
                "bSort": false,
                "sAjaxSource": "query.php",
                "sPaginationType": "full_numbers",
                "aoColumns": [
                    null,
                    null,
                    null,
                ],
                "fnRowCallback": function (nRow, aData, iDisplayIndex) {
                    $(nRow).attr("id", aData[4]);
                    return nRow;
                },
               "fnDrawCallback": function( oSettings ) {
                // How do I call fnRowCallback here?
               // losing post processing because it is not being called after a redraw
                }
    });

<tr>
    <td>a</td>
    <td class="boldmetight">b</td>
  </tr>
  <tr>
    <td class="boldmetight">c</td>
    <td>d</td>
  </tr>.. etc

var otable = $("#datatable").dataTable({
    "fnRowCallback": function(nRow, aData, iDisplayIndex) {
      $('.boldmetight', nRow).html('<b>' +  $('.boldmetight', nRow).text() + '</b>');
    }
  });