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https://issues.apache.org/jira/browse/KAFKA-12839?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax updated KAFKA-12839:
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Summary: SlidingWindow with timeDifference zero fails (was: SlidingWindow
with timeDifference 0 fails)
> SlidingWindow with timeDifference zero fails
> --------------------------------------------
>
> Key: KAFKA-12839
> URL: https://issues.apache.org/jira/browse/KAFKA-12839
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Matthias J. Sax
> Assignee: Luke Chen
> Priority: Major
> Labels: needs-kip
>
> Trying to use a sliding window with time-difference 0 (that is officially
> supported) fails with an exception and Kafka Stream crashes with
> {{IllegalArgumentException: Window endMs must be greater than window startMs}}
> The underlying issue is the usage of {{TimeWindow}} to represent the window
> what is incorrect.
> {{TimeWindow}} is designed for hopping/tumbling windows with an inclusive
> lower and exclusive upper bound. Thus, the upper bound must be larger than
> the lower bound, because otherwise the window would have a negative size what
> is not allowed.
> For sliding windows, we use include lower and upper bound though, and thus
> want to set upper and lower bound to be the same, what would still result in
> a window of size 1 (note that time-difference of 0 results in window size 1).
> It seems we need to introduce a new {{SlidingWindow}} type.
> Note, that for a non-zero time-difference, the window bounds are computed
> "correctly", however, {{TimeWindow}} is still an incorrect representation
> because it represents `[start,end)` instead of `[start,end]`.
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