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From Aljoscha Krettek <aljos...@apache.org>
Subject Re: Do timestamps and watermarks exist after window evaluation?
Date Thu, 09 Nov 2017 14:32:46 GMT
Hi,

This new section in the windowing documentation will help answer your question: https://ci.apache.org/projects/flink/flink-docs-release-1.4/dev/stream/operators/windows.html#working-with-window-results
<https://ci.apache.org/projects/flink/flink-docs-release-1.4/dev/stream/operators/windows.html#working-with-window-results>

Please let me know if you have any further questions. :-)

Best,
Aljoscha

> On 8. Nov 2017, at 18:54, Derek VerLee <derekverlee@gmail.com> wrote:
> 
> When composing ("chaining") multiple windowing operations on the same
> stream are watermarks transmitted down stream after window evaluation,
> and are the records emitted from WindowFunctions given timestamps? Do I
> need to or should I always assignTimestampsAndWatermarks to the
> outputsof window evaluations if I want to window again? If automatically
> assigned, how should I think about them in an event time context? Would
> the event time of a record resulting from a WindowFunction be the
> window's end time in the case of a TimeWindow?
> 


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