Hi 我觉得你的整个程序能从没有checkpoint开始跑就很奇怪,你们的 value state descriptor里面没有定义default value,那么调用#value() 接口返回的就是null,所以第一次调用 #update 时候还从state里面取值,最后还能跑通就很奇怪。
我建议本地在IDE里面debug看一下吧,可以把clear的条件改一下,不要弄成隔天才清理,可以让本地可以复现问题。 祝好 唐云 ________________________________ From: 守护 <346531...@qq.com> Sent: Tuesday, March 31, 2020 16:31 To: user-zh <user-zh@flink.apache.org> Subject: 回复: ProcessWindowFunction中如何有效清除state呢 感谢您回复 代码中if(stateDate.equals("") || stateDate.equals(date))的判断逻辑确实能走到pv_st.clear()中,1.最后输出结果时发现pv_st中的状态没有清空,还是累加计算,2.state.clear() 之后,再次获取时,返回值会是null,代码片段里面确实没有对null值的校验,而是直接更新值pv_st.update(pv_st.value() + c_st),是和这个能有关系吗 ------------------ 原始邮件 ------------------ 发件人: "Yun Tang"<myas...@live.com>; 发送时间: 2020年3月31日(星期二) 下午3:59 收件人: "user-zh"<user-zh@flink.apache.org>; 主题: Re: ProcessWindowFunction中如何有效清除state呢 Hi 从代码看 if(stateDate.equals("") || stateDate.equals(date)) 无法判断究竟是从哪里获取到stateDate变量赋值,不清楚你这里里面的判断逻辑是否能生效。 其次,state.clear() 之后,再次获取时,返回值会是null,代码片段里面也没有看出来哪里有对这个的校验。 祝好 唐云 ________________________________ From: 守护 <346531...@qq.com> Sent: Tuesday, March 31, 2020 12:33 To: user-zh <user-zh@flink.apache.org> Subject: ProcessWindowFunction中如何有效清除state呢 各位好: --版本 FLINK 1.10.0 ON YARN --过程 1.定义一个&nbsp; .window(TumblingProcessingTimeWindows.of(Time.days(1)))窗口 2.定义一个new Trigger(),.trigger(ContinuousProcessingTimeTrigger.of(Time.minutes(10))) 3.定义一个new ProcessWindowFunction(),每隔固定时间计算一次,业务是每天0点开始算这一天的数据,第二天清空从新计算, --问题 &nbsp;在 new ProcessWindowFunction()中创建了ValueState,想在第二天0点的时候ValueState清空开始重新计算,但是返现ValueState并没有清空,而是叠加前一天的继续计算,这个.clear()方法应该在什么时候加,才能生效呢? --部分代码 .window(TumblingProcessingTimeWindows.of(Time.days(1))) .trigger(ContinuousProcessingTimeTrigger.of(Time.minutes(10))) .process(new ProcessWindowFunction[(String,String,Long), String, Tuple, TimeWindow] { &nbsp; &nbsp; &nbsp; &nbsp; private var pv_st: ValueState[Long] = _&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; override def open(parameters: Configuration): Unit = { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;pv_st = getRuntimeContext.getState[Long](new ValueStateDescriptor[Long]("pv_stCount", classOf[Long])) &nbsp; &nbsp; &nbsp; &nbsp; } &nbsp; &nbsp; &nbsp; &nbsp;override def process(key: Tuple, context: Context, elements: Iterable[(String,String,Long)], out: Collector[String]): Unit = { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; var c_st = 0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; val elementsIterator = elements.iterator &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // 遍历窗口数据,获取唯一word &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; while (elementsIterator.hasNext) { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; val ac_name = elementsIterator.next()._2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if(!ac_name.isEmpty &amp;&amp; ac_name.equals("listentime")){ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; c_st +=1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; val time: Date = new Date() &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; val dateFormat: SimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd") &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; val date = dateFormat.format(time) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // add current &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;pv_st.update(pv_st.value() + c_st) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; var jsonStr = ""+key.getField(0)+"_"+date+"&amp;" // json格式开始 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; jsonStr += "{"+ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "\"yesterday_foreground_play_pv\":\""+pv_st.value()+ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "\"}"; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //判断逻辑,是否到第二天,如果到第二天状态数据全部清空,重新累加 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if(stateDate.equals("") || stateDate.equals(date)){ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; stateDate=date &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; out.collect(jsonStr) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }else{ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; out.collect(jsonStr) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; pv_st.clear() &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; stateDate=date &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } &nbsp; &nbsp; &nbsp; &nbsp; } &nbsp; &nbsp; &nbsp; })