flink之延迟数据处理watermark allowedLateness() sideOutputLateData()
针对eventtime处理乱序数据,如何保证在需要的窗口内获得指定的数据?flink采用watermarkallowedLateness()sideOutputLateData()三个机制来保证获取数据先来示例importorg.apache.flink.streaming.api.TimeCharacteristicimportorg.apache.flink.streaming.api.fun