code: def processDatasetBlocks(self, url, conn, inputdataset, order_counter):
          
          ordered_dict = {}
          srcblks = self.getSrcBlocks(url, dataset=inputdataset)
          if len(srcblks) < 0:
              e = "DBSMigration: No blocks in the required dataset %s found at source %s."%(inputdataset, url)
              dbsExceptionHandler('dbsException-invalid-input2', e, self.logger.exception, e)
          dstblks = self.blocklist.execute(conn, dataset=inputdataset)
  	self.logger.debug("******* dstblks for dataset %s ***********" %inputdataset)
  	self.logger.debug(dstblks)
          blocksInSrcNames = [ y['block_name'] for y in srcblks]
  	blocksInDstNames = []
  	for item in dstblks:
  	    blocksInDstNames.append(item['block_name'])
          ordered_dict[order_counter] = []
          for ablk in blocksInSrcNames:
              if not ablk in blocksInDstNames:
                  ordered_dict[order_counter].append(ablk)
          if ordered_dict[order_counter] != []:
  	    self.logger.debug("**** ordered_dict dict length ****")
  	    self.logger.debug(len(ordered_dict)) 	
              return ordered_dict
          else:
              return {}
docs: Utility function, that comapares blocks of a dataset at source and dst
          and returns an ordered list of blocks not already at dst for migration