Watermarks in Event Time windowing

Posted by Taher Koitawala on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Watermarks-in-Event-Time-windowing-tp23061.html

Hi All,

          Can someone show a good example of how watermarks need to be generated when using EventTime windows?  What happens if the watermark is same as the timestamp?  How does the watermark help in the window to be triggered and what if watermarks are kept behind the currentTimestamps in the assignTimestampsAndWatermarks function.