??flink???????? Streaming-Event time-Overview
??????processing time / event time / ingestion time????????
?????????? event time ??????????????????????
Note that sometimes when event time programs are processing live data in 
real-time, they will use some processing timeoperations in order to guarantee 
that they are progressing in a timely fashion.??????????????event 
time?????????????????????????????????????????????????? processing time 
??????????????????????????????1.??????????????????2.????????????????3.??????????????????????

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