结果集正在csv中写入更多记录

Question

我正在尝试从具有约1300万条记录的表中读取数据。我使用setFetchSize逐批读取记录，进行一些查找并将其写入csv文件。但是输出csv产生的记录超过了5000万，这是意料之外的。我怀疑迭代无法正常运行。任何帮助将不胜感激。

def processRecords(ParamHelper params){

                 try {
                        CSVWriter writer;
                        writer = new CSVWriter(new FileWriter(params.outputDir.getAbsolutePath()+"/Records_fact.csv"),(Character)'\t',(Character)'\u0000',(Character)'\n');

                String contractRateSql = "select contract_id,season from table";

                ResultSet resRecords = stmt.executeQuery(contractRateSql);
                Map <String,Map<String,String>> masterRecords = new HashMap<String,Map<String,String>>();
                Map<String,String> existingRecords = null;
                int count = 0;
                resRecords.setFetchSize(10000)
                while(resRecords.next()) {
                        try{
                                existingRecords = new HashMap<String,String>();
                                existingRecords.put("cont_id",resRateRecords.getString("contract_id"));
                                existingRecords.put("season",resRateRecords.getString("season"));
                                masterRecords.put(resRecords.getString("contract_id")+"#"+count++,existingRecords);
                        }

                        catch(Exception e){
                                e.printStackTrace();
                        }

                        masterRecords.each{ k, v ->
                                try{
                                    //some process 
                                }catch(Exception e){

                                        e.printStackTrace();

                                }
                        }

                        if(valueList.size()>0)
                                writer.writeAll(valueList);



                        try {
                        if (resRateRecords != null) resRateRecords.close();
                        } catch (Exception e) {

                        };


                }
                writer.close();
                catch(Exception e){
                        e.printStackTrace();
                        println("Occured while fetching the data");
                }

        }
    }