[jira] [Created] (KAFKA-8504) Suppressed do not emit with TimeWindows

["Simone (JIRA)" <ji...@apache.org>]

Simone created KAFKA-8504:
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             Summary: Suppressed do not emit with TimeWindows
                 Key: KAFKA-8504
                 URL: https://issues.apache.org/jira/browse/KAFKA-8504
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 2.2.1
            Reporter: Simone


Hi, I'm playing a bit with KafkaStream and the new suppress feature. I noticed that when using a {{TimeWindows}} without explicitly setting the grace {{suppress}} will not emit any message if used with {{Suppressed.untilWindowCloses.}}

I look a bit into the code and from what I understood with this configuration {{suppress}} should use the {{grace}} setting of the {{TimeWindows}}. But since using {{TimeWindows.of(Duration)}} default the grace to {{-1}} and when getting the grace using the method {{TimeWindows.gracePeriodMs()}} in case of grace equals to -1 the return value is set to {{maintainMs() - size()}} I think that the end of window is not properly calculated. 

Of course is possible to avoid this problem forcing the {{grace}} to 0 when creating the TimeWindows but I think that this should be the default behaviour at least when it comes to the suppress feature.

I hope I have not misunderstood the code in my analysis, thank you :)

Simone





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