[jira] [Resolved] (KAFKA-6451) Simplify KStreamReduce

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

     [ https://issues.apache.org/jira/browse/KAFKA-6451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guozhang Wang resolved KAFKA-6451.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 1.1.0

> Simplify KStreamReduce
> ----------------------
>
>                 Key: KAFKA-6451
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6451
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 1.0.0
>            Reporter: Matthias J. Sax
>            Assignee: Tanvi Jaywant
>            Priority: Minor
>              Labels: beginner, newbie
>             Fix For: 1.1.0
>
>
> If we do aggregations, we drop records with {{key=null}} or {{value=null}}. However, in {{KStreamReduce}} we only early exit if {{key=null}} and process {{value=null}} – even if we only update the state with it's old value and also only send the old value downstream (ie, we still compute the correct result), it's undesired and wasteful and we should early exit on {{value=null}}, too.
> This problem might occur for {{KStreamAggregate}} or other processors, too, and we need to double check those to make sure we implement consistent behavior.



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