code: protected void accumulatePersistedNodesChanges(Map<String, Long> calculatedChangedNodesSize)
        throws QuotaManagerException
     {
        for (Entry<String, Long> entry : calculatedChangedNodesSize.entrySet())
        {
           String nodePath = entry.getKey();
           long delta = entry.getValue();
  
           try
           {
              long dataSize = delta + quotaPersister.getNodeDataSize(rName, wsName, nodePath);
              quotaPersister.setNodeDataSizeIfQuotaExists(rName, wsName, nodePath, dataSize);
           }
           catch (UnknownDataSizeException e)
           {
              calculateNodeDataSizeTool.getAndSetNodeDataSize(nodePath);
           }
        }
     }
docs: Update nodes data size.