code: public void logAppendFile(String path, INodeFileUnderConstruction newNode)  
                     throws IOException {
      AppendOp op = AppendOp.getInstance();  
      op.set(path, 
          newNode.getBlocks(),
          newNode.getClientName(),
          newNode.getClientMachine());   
      logEdit(op);
    }
docs: Add append file record to the edit log.