keyedStream? key不同可能是。 谌祖安 <shenz...@pcitech.com> 于2021年2月7日周日 下午6:00写道:
> 您好! > > > 重载procesElement方法,每条stream数据处理时,put数据进入map,后面每条数据处理时先判断是否在map中有相同的key值,无则新增后put进map,有则加工后put进map。 > 在实际代码中发现,每次写入put后,map有数据,但处理下一条数据时,先从map读取数据,发现map已经为空。 > 请问是哪里写错了吗? 和 flink官网中 state.update(current);有什么不同吗? > > 以下为代码: > private MapState<String, MicsTrainPractical> map; //定义map > @Override > public void processElement(MicsTrainPracticalDetail value, Context ctx, > Collector<MicsTrainPractical> out) throws Exception { > > MicsTrainPractical current = map.get(value.getTrainNumber()); > > System.out.println(map.isEmpty()); // > 每次数据进来都发现map已经为空,不能保存前面数据进来时put的数据 > Long departTime = > DateTimeUtils.convertToTimestampSecond(value.getDepartTime()); > Long arrivalTime = > DateTimeUtils.convertToTimestampSecond(value.getArrivalTime()); > if (current == null) { //如果map中没有获取到string相同的数据,则新建一条数据put进去 > MicsTrainPractical actual = new MicsTrainPractical(); > actual.setTrainId(value.getTrainNumber()); > actual.setCarId(value.getCarId()); > actual.setStartStationId(value.getStationId()); > actual.setStartPracticalArrivalTime(arrivalTime); > actual.setEndPracticalArrivalTime(arrivalTime); > actual.setStartPracticalDepartTime(departTime); > actual.setEndPracticalDepartTime(departTime); > actual.setEndStationId(value.getStationId()); > actual.setStopTime(0L); > actual.setDs(value.getDs()); > actual.setIsInsert(true); > actual.setTargetStationId(value.getTargetStationId()); > out.collect(actual); > map.put(value.getTrainNumber(), actual); //向map中写入数据 > return; > } else { //如果map有获取到string相同的数据,则转换数据后写入map > > MicsTrainPractical actual = new MicsTrainPractical(); > actual.setTrainId(value.getTrainNumber()); > actual.setCarId(value.getCarId()); > actual.setStartStationId(current.getStartStationId()); > actual.setEndStationId(value.getStationId()); > > actual.setStartPracticalArrivalTime(current.getStartPracticalArrivalTime()); > > actual.setStartPracticalDepartTime(current.getStartPracticalDepartTime()); > actual.setEndPracticalArrivalTime(arrivalTime); > actual.setEndPracticalDepartTime(departTime); > actual.setStopTime(current.getStopTime() + Math.abs(departTime > - arrivalTime)); > actual.setDs(value.getDs()); > actual.setIsInsert(false); > actual.setTargetStationId(value.getTargetStationId()); > current.setEndStationId(actual.getEndStationId()); > > current.setEndPracticalDepartTime(actual.getEndPracticalDepartTime()); > > current.setEndPracticalArrivalTime(actual.getEndPracticalArrivalTime()); > current.setStopTime(actual.getStopTime()); > current.setIsInsert(actual.getIsInsert()); > > MicsTrainSectionInfo trainSectionInfo = new > MicsTrainSectionInfo(); > trainSectionInfo.setTrainId(actual.getTrainId()); > trainSectionInfo.setCarId(actual.getCarId()); > trainSectionInfo.setStartStationId(current.getEndStationId()); > trainSectionInfo.setEndStationId(actual.getEndStationId()); > > trainSectionInfo.setDepartTime(current.getEndPracticalDepartTime()); > > trainSectionInfo.setArrivalTime(actual.getEndPracticalArrivalTime()); > > map.put(value.getTrainNumber(), actual); > out.collect(actual); > ctx.output(outputTagSectionFlow, trainSectionInfo); > } > } > > > > > 谌祖安 > 智能轨道交通业务群 / 产品事业部 / 开发经理 > Intelligent RailTransportation BG /Development Manager > 广东省广州市天河区新岑四路2号佳都智慧大厦 > PCI Intelligence Building, No. 2 Xincen Fourth Road, Tianhe District, > Guangzhou, Guangdong > E shenz...@pcitech.com > M 86-18680458868 > www.pcitech.com >