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flink的EventTime和Watermark-CSDN博客
时间机制 Flink中的时间机制主要用在判断是否触发时间窗口window的计算。 在Flink中有三种时间概念:ProcessTime、IngestionTime、EventTime。 ProcessTime:是在数据抵达算子产生的时间(Flink默认使用ProcessTime) IngestionTime:是在DataSource生成数据产生的时间 EventTime:是数据本身携带的时间,具有实际业务含义,不是Flink框架产生的时间 水位机制 由于网络原因、故障等原因,数据的EventTIme并不是单调递增的,是乱序的,有时与当前实际时间相差很大。 水位(watermark)用在EventTime语义的窗口计算,可以当作当前计算节点的时间。当水位超过窗口的endtime,表示事件时间t <= T的数据都**已经到达,**这个窗口就会触发WindowFunction计算。当水位超过窗口的endtime+允许迟到的时间,窗口就会消亡。本质是DataStream中的一种特殊元素,每个水印都携带有一个时间戳。 队列中是乱序的数据,流入长度3s的窗口。2s的数据进入[0,4)的窗口中...
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