Record has Long.MIN_VALUE timestamp (= no timestamp marker). Is the time characteristic set to 'ProcessingTime', or did you forget to call 'DataStream.assignTimestampsAndWatermarks(...)'

Flink启动报错日志如下：

Caused by: java.lang.RuntimeException: Record has Long.MIN_VALUE timestamp (= no timestamp marker). Is the time characteristic set to 'ProcessingTime', or did you forget to call 'DataStream.assignTimestampsAndWatermarks(...)'?
	at org.apache.flink.streaming.api.windowing.assigners.TumblingEventTimeWindows.assignWindows(TumblingEventTimeWindows.java:77)
	at org.apache.flink.streaming.runtime.operators.windowing.WindowOperator.processElement(WindowOperator.java:293)
	at org.apache.flink.streaming.runtime.tasks.OneInputStreamTask$StreamTaskNetworkOutput.emitRecord(OneInputStreamTask.java:193)
	at org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput.processElement(StreamTaskNetworkInput.java:179)
	at org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput.emitNext(StreamTaskNetworkInput.java:152)
	at org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:67)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:372)
	at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:186)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:575)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:539)
	at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:722)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:547)
	at java.lang.Thread.run(Thread.java:748)

　　

查看代码是使用 ProcessingTime还是 EventTime进行业务处理， 如果是使用的事件时间进行处理的业务，则应该指定相应的事件时间和watermark

.window(TumblingEventTimeWindows.of(Time.seconds(8))) //添加滚动窗口 ，采用事件时间进行处理
.window(SlidingProcessingTimeWindows.of(Time.seconds(10),Time.seconds(5))) //添加滑动窗口，采用处理时间进行处理

　　

参考：

https://blog.csdn.net/u010002184/article/details/115726664