function getNewData() {
  //deleting triggers
  var triggers = ScriptApp.getProjectTriggers();    
  for (var i = 0; i < triggers.length; i++) {
    if (triggers[i].getHandlerFunction()=='getNewData'){
      ScriptApp.deleteTrigger(triggers[i]);
    }
  }  
  //max running time = 5.5 min
  var MAX_RUNNING_TIME = 330000;
  var startTime= (new Date()).getTime();
  //get cache
  var cache = CacheService.getUserCache();
  var downloaded =JSON.parse(cache.get('downloaded'));  
  var compared =JSON.parse(cache.get('compared'));
  //start
  if (downloaded==1 && compared!=1){
    //folder
    var Folder = DriveApp.getFoldersByName('theFolder').next();
    var FolderId = licitacionesFolder.getId();
    //call old_spreadsheet
    var searchFor ="fullText contains 'sheet_old' and '" + FolderId + "' in parents";  
    var files = DriveApp.searchFiles(searchFor); 
    var old_file = files.next();  
    var old_spreadsheet = SpreadsheetApp.openById(old_file.getId());
    var old_sheet = old_spreadsheet.getSheets()[0];
    var old_array = old_sheet.getDataRange().getValues();
    //call spreadsheet
    var searchFor ="fullText contains 'sheet' and '" + FolderId + "' in parents";  
    var files = DriveApp.searchFiles(searchFor); 
    var file = files.next();  
    var spreadsheet = SpreadsheetApp.openById(old_file.getId());
    var sheet = spreadsheet.getSheets()[0];
    var array = sheet.getDataRange().getValues();
    Logger.log(array.length+'::'+old_array.length); 
    // Column
    var searchString = 'NAME';
    var RC = getColumn(array,searchString);    
    var Row = RC.Row;
    var Column = RC.Column;
    var RC = getColumn(old_array,searchString);    
    var Row_old = RC.Row;
    var Column_old = RC.Column;    
    Logger.log(Row_old+':::'+Column_old+'\n'+Row+':::'+Column);      
    //compare 
    var diff_index =JSON.parse(cache.get('diff_index'));
    var row_ind =JSON.parse(cache.get('row_ind'));  
    var Roww =JSON.parse(cache.get('Row'));  
    if (diff_index==null){var diff_index = [];}
    if (row_ind==null){var row_ind = 0;}
    if (Roww==null){var Roww = Row;}    
    Logger.log(row_ind+'\n'+Roww);    
    for (var i=Roww;i= MAX_RUNNING_TIME){
        Logger.log((currTime - startTime)/(1000*60));
        Logger.log(i+'::'+row_ind);
        cache.putAll({'diff_index': JSON.stringify(diff_index),'row_ind': JSON.stringify(row_ind),'Row': JSON.stringify(i-1)},21600);   
        ScriptApp.newTrigger('getNewData').timeBased().after(2 * 60 * 1000).create();
        return;
      } else {
        Logger.log(i);
        var existe = ArrayLib.indexOf(old_array, Column_old, array[i][Column]);
        if (existe==-1){      
          Logger.log(row_ind+'!!!');
          diff_index[row_ind]=i;
          row_ind++;          
        }
      }
    }    
    cache.putAll({'diff_index': JSON.stringify(diff_index),'Row': JSON.stringify(Row),'compared': JSON.stringify(1)},21600);
  } else {
    Logger.log('file not downloaded yet or already compared');
  }
}

function getColumn(array,searchString){
  for (var i = 0; i < array.length; i++) {    
    for (var j = 0; j < array[i].length; j++) {    
      if (array[i][j] == searchString) {
        var Row = i+1;
        var Column = j;
        break;
      }      
    }
    if (Row != undefined){
      break;
    }
  }
  return {Row: Row, Column: Column};
}