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From Jonas <jo...@huntun.de>
Subject Re: How to sessionize stream with Apache Flink?
Date Sun, 18 Jun 2017 13:10:37 GMT
Hey Milad,

since you cannot look into the future which element comes next, you have to
"lag" one behind. This requires building an operator that creates 2-tuples
from incoming elements containing (current-1, current), so basically a
single value state that emits the last and the current element in a tuple.

In a trigger, the element is then of the 2-tuple type and you can see
changes "beforehand". The last element of 1's is then (1, 2).

Hope this helps.



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