[jira] [Updated] (KAFKA-8504) Update Docs to explain how to use suppress() in more details

["Matthias J. Sax (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-8504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias J. Sax updated KAFKA-8504:
-----------------------------------
    Summary: Update Docs to explain how to use suppress() in more details  (was: Suppressed do not emit with TimeWindows)

> Update Docs to explain how to use suppress() in more details
> ------------------------------------------------------------
>
>                 Key: KAFKA-8504
>                 URL: https://issues.apache.org/jira/browse/KAFKA-8504
>             Project: Kafka
>          Issue Type: Improvement
>          Components: documentation, streams
>    Affects Versions: 2.2.1
>            Reporter: Simone
>            Priority: Minor
>              Labels: newbie
>
> 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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